Clark Equipment Company, an iconic name in the construction and materials handling sector, has been a leader in manufacturing a wide range of machinery designed to increase productivity in industrial operations. With a history spanning over a century, Clark has significantly influenced various industries with its innovations, particularly in material handling, lift trucks, and other heavy-duty machinery.
This article delves into the legacy of Clark Equipment, its product offerings, common issues with its machinery, and how to maintain and repair Clark equipment for optimal performance.
The Clark Equipment Legacy
Founded in 1903, Clark Equipment initially specialized in automotive parts and then expanded into the heavy machinery sector. Over the years, Clark has been responsible for some of the most innovative products in the field of material handling and construction equipment.
One of Clark’s hallmark contributions is the development of the first gas-powered forklift, a breakthrough that changed the course of material handling forever. Since then, the company has continued to innovate with designs that focus on durability, efficiency, and safety. Clark Equipment's product lines include forklifts, skid steer loaders, and a variety of construction machines, many of which are still in use today across industries.
Key Products and Innovations
Clark’s range of machinery spans several categories, but the company is most widely known for its forklifts. Over the decades, Clark forklifts have been at the forefront of innovation, with features like increased load capacity, better maneuverability, and advanced safety features.

1. Clark Forklifts:
   Clark forklifts were among the first to be widely adopted in the U.S. and international markets. Their robust design, ease of use, and versatility made them a popular choice in warehouses, factories, and construction sites. The Clark 7,000-pound capacity forklift, for instance, set new standards for lifting capability and stability, becoming a mainstay in warehouses across the country.
   
2. Clark Skid Steer Loaders:
   Clark's skid steer loaders were among the first to introduce radial lift arms, improving stability and load capacity. Their compact size and powerful lifting capabilities made them ideal for small-scale construction and demolition jobs, particularly in tight spaces where larger equipment couldn’t fit.
   
3. Clark Material Handlers:
   Clark also produced equipment for handling large materials in industrial and construction settings. The material handler systems have evolved over the years to accommodate more complex and heavy-duty applications.
   

1. Hydraulic Issues:
   A frequent concern with Clark forklifts and loaders is hydraulic failure. This can manifest as slow or uneven lifting, fluid leakage, or a complete loss of lifting power. In many cases, this is caused by worn hydraulic seals, clogged filters, or fluid contamination.
   • Solution: Regular hydraulic system maintenance, including checking fluid levels and replacing filters, is key. For severe issues, it may be necessary to inspect hoses, valves, and the pump system for wear.
     
2. Electrical Failures:
   Electrical issues, such as malfunctioning lights, gauges, or the inability to start the engine, are common in older Clark equipment. These issues may stem from faulty wiring, blown fuses, or a worn battery.
   • Solution: Conducting routine electrical inspections and replacing any worn-out components (like fuses or batteries) can mitigate electrical failures. It's also vital to check the wiring for signs of damage or corrosion.
     
3. Engine and Transmission Problems:
   Over time, Clark’s older models may experience issues with the engine or transmission. Some machines might have trouble shifting gears, while others may display rough idling or stalling.
   • Solution: For transmission issues, ensure that the fluid is changed regularly. For engine problems, a thorough inspection and possibly a tune-up, including spark plug replacement and fuel system cleaning, may be necessary.
     
4. Tire Wear and Traction Issues:
   Due to the heavy load-bearing requirements, tire wear can be a significant issue for Clark equipment, especially forklifts and skid steers that are regularly used on rough terrain.
   • Solution: Inspect tires regularly for wear and replace them when necessary. Ensuring the correct tire pressure and using high-quality tires suited for the work environment can prolong tire life.
     

1. Regular Inspections:
   Schedule routine inspections to check for wear on critical components like the hydraulic system, engine, tires, and transmission. Early detection of issues can prevent more serious problems down the road.
   
2. Fluid Changes:
   Regularly change engine oil, hydraulic fluid, and transmission fluid to prevent clogging, overheating, and system failure. The manufacturer’s manual will provide guidelines on intervals for fluid changes.
   
3. Cleaning:
   Keeping Clark equipment clean is vital. Dust, debris, and grime can clog air filters, hydraulic lines, and engine parts, leading to premature wear. Ensure regular cleaning, especially after working in dirty or muddy conditions.
   
4. Battery Maintenance:
   For forklifts and other Clark equipment that rely on batteries, proper battery maintenance is essential. Check the battery regularly for corrosion and clean it. Also, ensure the battery is charged according to the manufacturer’s specifications.
   

The 1990 Case Poclain 170C excavator is a robust and reliable piece of machinery, known for its powerful performance in demanding construction and digging applications. One of the key features of the 170C is its pilot controls, which allow operators to precisely manage the machine’s movements. However, like any heavy equipment, pilot controls can sometimes encounter issues, leading to difficulties in operating the machine.
In this article, we will explore common issues with the pilot controls on the 1990 Case Poclain 170C, how to troubleshoot them, and offer tips for maintaining this system to ensure optimal performance.
Understanding Pilot Controls on the Case Poclain 170C
Pilot controls are hydraulic systems used to manage the movement of the machine’s booms, arms, and undercarriage. On the Case Poclain 170C, the pilot controls provide a smooth, responsive operation, ensuring that the operator has precise control over the machine’s actions. These controls typically use low-pressure hydraulic fluid to transmit the operator’s inputs to the hydraulic actuators, allowing for smoother, more intuitive operation than traditional mechanical linkages.
While pilot controls offer excellent performance, they are also more complex than standard controls, requiring careful maintenance and attention to avoid operational issues. Common issues with pilot controls include erratic behavior, unresponsive movement, and system malfunctions, all of which can impede work and potentially damage the machine.
Common Problems with Pilot Controls
Several issues can arise with the pilot controls on the Case Poclain 170C, ranging from simple hydraulic fluid problems to more complex mechanical failures. Here are the most common problems operators may face:

1. Unresponsive Pilot Controls
   One of the most frustrating problems with pilot controls is when they become unresponsive, meaning the machine’s movements don’t react as expected to the operator’s input. This issue can stem from a variety of causes:
   • Low Hydraulic Fluid Levels: If the hydraulic fluid levels are too low, the system may not be able to transmit the required pressure, leading to sluggish or unresponsive control movements.
     
   • Hydraulic Fluid Contamination: Dirt, debris, or moisture in the hydraulic fluid can cause blockages or affect the performance of the hydraulic pumps and valves.
     
   • Faulty Control Valves: If the pilot control valves are malfunctioning or dirty, the hydraulic pressure might not be regulated correctly, leading to unresponsive controls.
     
   Solution: Check and maintain proper hydraulic fluid levels, and replace the fluid if it's contaminated. Regularly inspect and clean the control valves, and replace them if necessary.
   
2. Erratic Movements
   Sometimes, the pilot controls on the 170C may cause erratic or inconsistent movements, where the machine moves in an unpredictable manner even with smooth operator inputs. This can be a sign of:
   • Air in the Hydraulic System: Air bubbles in the hydraulic lines can cause the control system to behave erratically, resulting in jerky or unpredictable movements.
     
   • Faulty Pilot Control Valve: A malfunctioning pilot control valve might not correctly regulate the hydraulic pressure, causing inconsistent movement.
     
   • Clogged Filters: Clogged hydraulic filters can impede the flow of hydraulic fluid, affecting the smooth operation of the controls.
     
   Solution: Bleed the hydraulic system to remove any air pockets. Inspect and clean the hydraulic filters regularly and replace them if they are clogged or worn. If erratic movements persist, check the pilot control valves for faults.
   
3. Hydraulic Leaks
   Another common issue with pilot controls is hydraulic leaks, which can cause a drop in pressure and lead to performance problems. Leaks in the hydraulic lines, hoses, or control valves can impair the system's ability to function properly.
   Solution: Regularly inspect the hydraulic lines and components for visible leaks. Tighten or replace any loose or damaged connections and ensure that the hoses are free from cracks or wear.
   
4. Pilot Pressure Issues
   If the pilot pressure is too low or too high, it can cause issues with the responsiveness of the pilot controls. Low pressure may result in sluggish or non-reactive movements, while high pressure can lead to system damage or overly sensitive controls.
   Solution: Ensure that the pilot pressure is set correctly according to the manufacturer’s specifications. Adjust or replace the pressure regulating valves if necessary.
   
5. Control Lever Wear
   Over time, the control levers can become worn, leading to imprecise or loose controls. This can affect the operator’s ability to make fine adjustments to the machine’s movements.
   Solution: Inspect the control levers for wear and replace any components that show signs of significant damage. Lubricate moving parts to maintain smooth operation.
   

1. Check Hydraulic Fluid Levels
   • Start by checking the hydraulic fluid levels and topping them up if necessary. Also, inspect the fluid for signs of contamination, such as discoloration or debris. If the fluid is dirty, drain and replace it with fresh, clean fluid.
     
2. Inspect Hydraulic Filters
   • Check the hydraulic filters for blockages. If they are clogged, clean or replace them. This will help restore proper fluid flow and prevent erratic movements.
     
3. Examine Pilot Control Valves
   • Inspect the pilot control valves for any signs of wear or malfunction. If the valves are dirty or faulty, clean or replace them to ensure proper regulation of hydraulic pressure.
     
4. Bleed the Hydraulic System
   • If you suspect air is trapped in the hydraulic system, bleed the system according to the manufacturer’s guidelines to remove any air pockets that could be causing erratic movement.
     
5. Check for Leaks
   • Perform a thorough inspection of the hydraulic hoses, lines, and valves for signs of leakage. Tighten any loose connections and replace any worn or damaged hoses.
     
6. Test the Pilot Pressure
   • Verify that the pilot pressure is within the correct range. If the pressure is too low or too high, adjust the regulating valve to the proper setting.
     
7. Inspect the Control Levers
   • Inspect the control levers for wear. If the levers are loose or damaged, replace them to restore precision in your control inputs.
     

1. Regular Fluid Checks
   Ensure that the hydraulic fluid is regularly checked and replaced at recommended intervals. This will prevent contamination and ensure smooth control operation.
   
2. Clean the Hydraulic System
   Keep the hydraulic system clean by regularly changing filters and cleaning the control valves. This will help prevent clogging and reduce the risk of erratic movements.
   
3. Inspect Hoses and Connections
   Routinely inspect hydraulic hoses and connections for signs of wear or leaks. Tighten any loose fittings and replace any cracked or worn hoses to avoid hydraulic pressure loss.
   
4. Adjust Pilot Pressure as Needed
   Regularly check and adjust the pilot pressure to ensure optimal control performance. Keeping pressure within the manufacturer’s recommended range will help prevent control issues.
   
5. Lubricate Moving Parts
   Ensure that all moving parts of the control levers and hydraulic components are properly lubricated to reduce friction and wear.
   

The Kelly box, often a vital component in drilling operations, plays a central role in supporting the rotation of the drill stem in rotary drilling systems. These systems are common in industries such as oil and gas exploration, mining, and even construction. The Kelly box is designed to connect the drill string to the power system, allowing for the rotation and lowering of the drill pipe while providing a firm anchor.
This article will explore the process of fabricating a Kelly box, the materials typically used, and best practices for construction. Along with insights into the fabrication, we’ll consider common issues faced in this process and how proper planning and design can mitigate them. For those involved in drilling operations, understanding the Kelly box's role and the complexities involved in its creation can help ensure that your equipment works smoothly for years.
Understanding the Role of the Kelly Box in Drilling Operations
The Kelly box serves as a connection point between the drill string and the rotary table, which drives the drill bit. It is crucial because it transmits the torque needed to rotate the drill string and can also house the Kelly bar, a tool used to transfer the rotational energy from the rig to the drill stem.
In drilling operations, whether onshore or offshore, a properly fabricated Kelly box ensures minimal wear and tear on the rotating parts of the rig. It also allows for quick and efficient movement of the drill stem, thereby speeding up the drilling process while maintaining operational integrity.
Materials Used in Kelly Box Fabrication
The materials chosen for the fabrication of a Kelly box are essential for the overall strength and durability of the component. Typically, the following materials are used in the construction of a Kelly box:

1. Steel: The most common material used, especially high-grade alloy steel, which offers excellent tensile strength and resistance to corrosion. Steel provides the structural integrity needed for withstanding the high stresses and pressures during drilling operations.
   
2. Cast Iron: For some smaller or less demanding applications, cast iron might be used for its cost-effectiveness. However, it tends to be more brittle and less suitable for high-stress environments compared to steel.
   
3. Chromium Alloy Steel: In highly demanding environments where the Kelly box will endure abrasive conditions, chromium alloy steel is used for its superior wear resistance and toughness.
   
4. Heat-treated Steel: Heat treating the steel enhances its hardness and wear resistance. In environments where the Kelly box faces high friction and impact forces, heat-treated steel is often used.
   

1. Design and Planning:
   • The first step is to carefully plan the design of the Kelly box, taking into account the specifications of the rig, the type of drilling operation, and the environment in which the box will be used. Key design elements include the dimensions, wall thickness, and any internal reinforcements that will be needed to handle high torque loads.
     
2. Material Sourcing:
   • Once the design is finalized, high-quality materials are sourced. Steel is the most common choice, and it is important that the material chosen can withstand the stresses of drilling, including torque, pressure, and environmental wear.
     
3. Cutting and Shaping:
   • The material is then cut into the desired shapes using saws, plasma cutters, or lasers. The fabrication process requires precise cutting to ensure that the parts fit together properly.
     
4. Welding and Assembly:
   • After the parts are cut, they are welded together. Welding requires high precision to ensure that there are no weak spots in the Kelly box. It's crucial to use proper welding techniques to avoid any stresses or fractures in the metal. For additional strength, reinforcing components may be welded onto the box.
     
5. Inspection and Testing:
   • After assembly, the Kelly box must undergo a thorough inspection. This includes visual inspection for cracks, welding defects, or improper alignments. Stress tests are also conducted to simulate the loads that the Kelly box will face in real-world drilling conditions.
     
6. Finishing Touches:
   • Finally, any finishing work, such as painting or coating, is done to protect the box from corrosion. A protective coating such as powder coating or galvanizing can extend the life of the Kelly box, especially in harsh environments.
     

1. Inaccurate Measurements:
   • Incorrect dimensions can lead to issues with fitting the Kelly box into the rig or misalignment with the rest of the drilling components. To avoid this, ensure that all measurements are double-checked and that the design follows precise guidelines.
     
2. Poor Welding:
   • Welding is a crucial step in Kelly box fabrication, and poor welding can lead to weakness and potential failure during operation. Using skilled welders and ensuring proper welding practices are followed can significantly reduce the risk of issues.
     
3. Material Defects:
   • Using low-quality or defective materials can result in premature wear or even catastrophic failure of the Kelly box during drilling operations. Always source materials from reputable suppliers and check for any defects before beginning the fabrication.
     
4. Underestimating Wear and Tear:
   • Drilling operations, especially those that take place in harsh environments (like offshore or deep underground), can exert a tremendous amount of stress on the Kelly box. When designing the box, account for high torque, pressure, and environmental factors such as corrosion or abrasiveness.
     

• Routine Inspection: Regularly inspect the Kelly box for signs of wear, cracks, or misalignment. Early detection of issues can prevent costly repairs and downtime.
  
• Lubrication: Ensure that all moving parts, including the connections, are properly lubricated. This reduces friction and wear, prolonging the life of the components.
  
• Corrosion Protection: Regularly clean the Kelly box and reapply protective coatings to guard against corrosion, especially if the drilling is conducted in harsh environments like saltwater or high-pressure conditions.
  

Forklifts are indispensable for material handling in warehouses, factories, and construction sites. Among the various forklift models, the Yale GLP050 is a popular choice for its reliability and performance. However, like all machinery, it can encounter mechanical issues over time, particularly with the transmission system. Transmission problems in forklifts can lead to reduced efficiency, safety risks, and costly repairs if not addressed promptly.
This article will explore common causes of transmission issues in the Yale GLP050, outline troubleshooting steps, and offer tips for preventative maintenance to keep the forklift running smoothly.
Understanding the Yale GLP050 Forklift Transmission
The Yale GLP050 is a gas-powered forklift that relies on a manual or automatic transmission to transfer power from the engine to the wheels. The transmission system in a forklift is crucial for controlling the movement, speed, and direction of the vehicle. Over time, components in the transmission can wear out, leading to a variety of operational issues.
Symptoms of Transmission Problems
The owner of a Yale GLP050 may notice several signs that indicate transmission trouble. Common symptoms of transmission problems in forklifts include:

• Difficulty Shifting Gears: The forklift may struggle to change gears, or the gear lever may feel stiff or unresponsive.
  
• Slipping Gears: When the forklift unexpectedly shifts out of gear or has trouble staying in gear, it is a sign of transmission failure.
  
• Unusual Noises: Grinding, whining, or whining noises when the forklift is in gear can indicate problems with the transmission.
  
• Loss of Power: A sudden loss of power when accelerating or decelerating can be a sign of a transmission issue.
  
• Unresponsive Movements: The forklift may move slowly or unresponsively even after the throttle is applied, indicating a transmission fault.
  

1. Low Transmission Fluid
   • Cause: Low or contaminated transmission fluid is one of the most frequent causes of transmission issues. Without enough fluid, the transmission cannot properly engage the gears, leading to slipping or failure to shift.
     
   • Solution: Always check the transmission fluid levels and inspect the condition of the fluid. If the fluid is low, top it off with the appropriate type of fluid specified in the operator's manual. If the fluid looks dirty, it may need to be replaced.
     
2. Worn or Damaged Transmission Components
   • Cause: Over time, gears, clutches, and other components inside the transmission can wear out or become damaged. This is especially common in forklifts that have been heavily used without proper maintenance.
     
   • Solution: Inspect the transmission for any signs of wear or damage, such as chipped gears or burnt-out clutches. If components are found to be damaged, they may need to be replaced to restore functionality.
     
3. Faulty Shift Linkage
   • Cause: The shift linkage controls the movement of the gear shifter. If the linkage becomes loose or misaligned, the forklift may have trouble engaging or changing gears.
     
   • Solution: Inspect the shift linkage for any signs of wear, misalignment, or looseness. Tighten or replace any damaged components as necessary to restore proper shifting.
     
4. Clogged Transmission Filter
   • Cause: The transmission filter plays an important role in keeping debris and contaminants out of the transmission fluid. Over time, the filter can become clogged, which restricts fluid flow and causes transmission problems.
     
   • Solution: Regularly inspect and replace the transmission filter as part of routine maintenance. A clogged filter should be replaced to ensure proper fluid flow and optimal transmission performance.
     
5. Malfunctioning Solenoid or Valve
   • Cause: The solenoid or valve controls the hydraulic pressure in the transmission system. If the solenoid or valve malfunctions, it can lead to erratic shifting or the inability to engage gears.
     
   • Solution: A malfunctioning solenoid or valve should be tested and replaced if necessary. A professional mechanic may be required to diagnose and repair this issue.
     
6. Overheating Transmission
   • Cause: Overheating of the transmission can be caused by prolonged heavy use, low fluid levels, or a malfunctioning cooling system.
     
   • Solution: Ensure that the transmission is properly lubricated and the cooling system is functioning correctly. If the transmission becomes overheated, allow it to cool down before continuing use. Check for leaks or cooling system malfunctions that could contribute to the issue.
     

1. Check Fluid Levels and Condition
   • Begin by checking the transmission fluid levels. If the fluid is low, add the correct type of fluid to the transmission. If the fluid appears dirty or contaminated, perform a fluid change.
     
2. Inspect the Transmission Filter
   • If the transmission fluid is clean but the forklift is still experiencing issues, inspect the transmission filter. A clogged filter can restrict fluid flow, causing shifting problems. Replace the filter if necessary.
     
3. Examine the Shift Linkage
   • Check the shift linkage for signs of damage or misalignment. Adjust or replace the linkage components if they appear worn or loose.
     
4. Test the Solenoid and Valve
   • If the forklift still won’t shift properly, the solenoid or valve may be faulty. Test these components to ensure they are functioning properly. If they are not, replace them.
     
5. Look for Transmission Leaks
   • Inspect the transmission housing for leaks. Leaks can cause fluid loss and lead to transmission issues. Repair any leaks you find.
     
6. Check for Overheating
   • Overheating can cause significant transmission problems. Check the cooling system and ensure that the transmission is not overheating. Clean the radiator and cooling components if necessary.
     

• Change Transmission Fluid Regularly: Follow the manufacturer’s recommended maintenance schedule for fluid changes. Dirty or low fluid can cause long-term damage to the transmission system.
  
• Inspect the Forklift Regularly: Regularly inspect the forklift for signs of wear, leaks, and other mechanical issues. Catching problems early can save you time and money on repairs.
  
• Use the Correct Fluid: Always use the recommended transmission fluid for your Yale GLP050. Using the wrong fluid can cause performance issues and damage the transmission.
  
• Avoid Overloading: Overloading the forklift can put unnecessary strain on the transmission, leading to premature wear and potential failure.
  

The CAT 287B skid steer loader is a powerhouse known for its performance, versatility, and reliability in tough working environments. However, like any piece of heavy equipment, it can encounter operational issues from time to time. One common problem reported by operators of the 287B is when the Interlock Override Light stays on, even when there’s no apparent reason for it.
The interlock system in the 287B is designed to ensure that certain safety conditions are met before the machine can be operated, including ensuring the seat belt is fastened and that the operator is in the correct position. When the interlock override light stays illuminated, it can indicate a problem within this system. This issue can prevent the machine from operating as expected and may require troubleshooting.
In this article, we’ll take a deep dive into the causes of the interlock override light staying on, possible fixes, and preventive measures to keep your CAT 287B in top working condition.
Understanding the Interlock System on the CAT 287B
The interlock system on the CAT 287B is a safety mechanism designed to prevent the machine from being operated under unsafe conditions. The system monitors several factors, including:

• Seat Belt Engagement: Ensures the operator is wearing the seatbelt.
  
• Operator Presence: Detects whether the operator is seated in the machine and in the proper position.
  
• Park Brake: Verifies that the park brake is engaged before starting the engine.
  

1. Faulty Seat Switch
   One of the most common culprits behind the interlock override light staying on is a malfunctioning seat switch. The seat switch is designed to detect whether the operator is in the seat. If the switch is faulty, it may incorrectly signal that the operator is not seated, causing the light to stay on.
   • Solution: Inspect the seat switch for signs of damage or wear. If the switch appears faulty or is not engaging correctly, replace it with a new one. This is often a quick and inexpensive fix that can resolve the issue.
     
2. Seat Belt Not Engaged Properly
   The seat belt engagement system is another common cause of the interlock light staying on. If the seat belt is not properly latched or is malfunctioning, the machine will interpret this as a safety issue and keep the override light illuminated.
   • Solution: Ensure that the seat belt is properly fastened and that the seat belt latch is functioning correctly. If the latch is worn or broken, replace it to restore proper operation.
     
3. Operator Presence Switch Malfunction
   The operator presence switch detects if the operator is seated in the machine. If this switch is malfunctioning, it may incorrectly signal that the operator is not in the seat, causing the system to prevent operation.
   • Solution: Check the operator presence switch for proper function. If it is not responding as expected, clean the connections or replace the switch. In some cases, simply adjusting the switch’s position can resolve the issue.
     
4. Faulty Park Brake Switch
   The park brake switch ensures that the brake is engaged before the machine can start. If the brake switch is faulty or not properly sensing that the park brake is engaged, the interlock system may prevent operation by keeping the override light on.
   • Solution: Check the park brake and the associated switch for any issues. Ensure that the brake is fully engaged and that the switch is properly functioning. If the switch is malfunctioning, it may need to be repaired or replaced.
     
5. Wiring or Electrical Issues
   Wiring issues, such as damaged wires or loose connections, can disrupt the signals from the interlock system components. This could lead to the override light staying on and prevent the machine from starting.
   • Solution: Inspect the wiring associated with the interlock system for any visible signs of wear, corrosion, or damage. Tighten any loose connections and repair or replace damaged wires as needed.
     
6. Software or Sensor Calibration Issues
   On some occasions, a sensor calibration issue or a software glitch in the machine’s control system can cause the interlock override light to stay on. This can happen if the system is not reading the interlock sensors properly.
   • Solution: If you suspect a sensor or software issue, it’s advisable to consult the dealer or technician to run diagnostics on the machine. A recalibration of the system or an update to the machine’s software may be required.
     

1. Check Seat Belt Engagement
   • Verify that the seat belt is properly fastened and the seat belt latch is secure. A worn or broken latch can cause the light to stay on.
     
2. Inspect the Seat Switch
   • Inspect the seat switch for any signs of wear or malfunction. If it’s not engaging properly, replace it with a new one.
     
3. Verify Operator Presence
   • Check the operator presence switch to ensure it’s detecting the operator in the seat. Clean any dirty connections and replace the switch if necessary.
     
4. Inspect the Park Brake Switch
   • Confirm that the park brake is properly engaged and check the associated switch for functionality. Replace the switch if it’s malfunctioning.
     
5. Examine Wiring and Electrical Connections
   • Look for damaged or corroded wiring in the interlock system. Repair or replace any faulty wiring or connectors.
     
6. Run Diagnostics
   • If the light remains on after addressing the above issues, run a diagnostic using the machine’s onboard diagnostic system to check for any error codes or system malfunctions. If needed, contact your dealer for assistance in recalibrating the system or updating the software.
     

1. Routine Inspections
   Regularly inspect the seat switch, seat belt latch, operator presence switch, and park brake system for signs of wear and tear. Catching problems early can save you time and money on repairs.
   
2. Clean and Lubricate Components
   Keep the switches, wiring, and connectors clean and properly lubricated to ensure smooth operation. Dirt or debris can interfere with the proper functioning of the system.
   
3. Monitor Electrical System
   Ensure that all electrical connections are tight and free of corrosion. Perform regular checks on the machine’s wiring and electrical components.
   
4. Stay on Top of Software Updates
   Check for software updates from CAT and make sure the machine’s control system is up-to-date. In some cases, updates may resolve issues with sensor calibration and system performance.
   

Heavy machinery, particularly road graders like the Champion 720A, are essential for construction, roadwork, and grading tasks. These machines are built to endure tough conditions, but like all equipment, they are susceptible to mechanical issues over time. One common problem is when the machine won’t engage in forward (F) or reverse ® gear. This issue can disrupt operations, and identifying the root cause is crucial to getting the grader back in action.
Understanding the Champion 720A Transmission System
The 1985 Champion 720A is equipped with a heavy-duty transmission system designed for reliable performance under challenging conditions. It features a hydrostatic transmission that allows for smooth and precise control over the grader’s movement. However, if the transmission fails to engage in either forward or reverse gear, it can be due to several potential causes.
Common Causes of Transmission Issues in the Champion 720A

1. Low Transmission Fluid: The most common reason for a grader failing to engage gears is low or contaminated transmission fluid. Transmission fluid plays a vital role in lubricating the gears, ensuring smooth operation, and providing hydraulic pressure to the transmission components.
   
2. Faulty Hydraulic Pump: The 720A uses a hydraulic pump to engage the transmission. If the hydraulic pump is malfunctioning, it can prevent the transmission from receiving the necessary fluid pressure, resulting in a failure to shift into gear.
   
3. Worn or Damaged Transmission Components: Over time, wear and tear on key transmission components such as the clutch, gears, or shift linkage can cause engagement problems. This is especially true for older machines that have been heavily used.
   
4. Faulty Electrical Connections: In some models, electrical connections or solenoids control the shifting mechanism. A poor electrical connection or a faulty solenoid can prevent the transmission from engaging correctly.
   
5. Clogged Transmission Filters: If the transmission filters are clogged, fluid flow may be restricted, leading to inadequate pressure in the transmission system. This can prevent the transmission from engaging in forward or reverse gear.
   

• Check Fluid Levels: Locate the transmission dipstick, remove it, and wipe it clean. Reinsert the dipstick and check the fluid level. If the fluid is below the recommended level, top it off with the correct transmission fluid as specified in the operator's manual.
  
• Inspect Fluid Condition: Look at the fluid color and consistency. If the fluid is brown or smells burnt, it may be contaminated and need replacement.
  

• Check for Leaks: Inspect the hydraulic system for any visible leaks. Leaks in the hydraulic lines, connections, or cylinders can reduce hydraulic pressure, preventing the transmission from shifting.
  
• Test Hydraulic Pump: If you suspect the hydraulic pump is faulty, it may need to be tested by a professional. A worn or damaged pump can fail to provide the necessary pressure to engage the transmission.
  

• Check the Clutch: The clutch is responsible for disengaging the transmission when shifting gears. If the clutch is worn or damaged, it may fail to disengage properly, preventing the machine from going into gear.
  
• Inspect the Gears: Look for any signs of wear or damage to the gears. Worn gears can prevent the transmission from engaging smoothly.
  
• Inspect the Shift Linkage: A misaligned or worn shift linkage can prevent the gear lever from properly engaging the transmission. Ensure the linkage is properly adjusted.
  

• Inspect Electrical Connections: Look for loose or corroded electrical connections, particularly at the transmission solenoid and associated components.
  
• Test the Solenoid: If you suspect the solenoid is malfunctioning, it can be tested with a multimeter. A faulty solenoid may need to be replaced.
  

• Locate and Replace the Filter: Refer to the operator’s manual to locate the transmission filter. If the filter is clogged, replace it with a new one. Ensure that the filter is installed correctly to avoid further issues.
  

• Regular Fluid Changes: Make it a habit to check and change the transmission fluid at regular intervals as specified in the operator’s manual. This helps prevent contamination and ensures smooth transmission operation.
  
• Inspect Hydraulics Regularly: Check hydraulic lines for leaks and keep the hydraulic fluid at the proper levels. Replace hydraulic fluid and filters as needed.
  
• Keep the Machine Clean: Regularly clean the machine to prevent dirt and debris from entering the transmission or hydraulic system.
  

The ASV RC 60, a compact track loader, is well-regarded for its versatility, ruggedness, and advanced suspension system that allows it to perform efficiently in tough terrains. However, like any piece of heavy machinery, it can sometimes encounter operational issues. One of the more frustrating problems operators of the ASV RC 60 may face is creeping, where the machine continues to move forward or backward when the controls are in neutral. This issue can compromise safety and efficiency, making it essential to understand the possible causes and solutions.
In this article, we’ll explore the potential causes behind the creeping issue in the ASV RC 60 and provide troubleshooting advice to help you resolve the problem and keep your machine running smoothly.
What is "Creeping" in the ASV RC 60?
In simple terms, creeping occurs when the loader moves unexpectedly, either forward or backward, even though the controls are in the neutral position. This behavior can happen when the hydrostatic transmission or other related components malfunction. The creeping can vary in intensity, from slow movement to more noticeable crawling across the ground, which can lead to operational difficulties and potential safety hazards.
The ASV RC 60 utilizes a hydrostatic transmission system, which provides seamless movement between forward and reverse using hydraulic pressure. When this system doesn’t function properly, creeping issues can arise, causing unwanted movement. Understanding the underlying causes is key to diagnosing and fixing the issue effectively.
Common Causes of Creeping in the ASV RC 60
Several factors can contribute to creeping in the ASV RC 60. Below are the most common causes that could be responsible for this issue:

1. Hydraulic System Issues
   The hydraulic system in the ASV RC 60 plays a central role in driving the wheels and controlling movement. When there are issues with the hydraulic fluid or components, the loader might creep even when the control lever is in the neutral position.
   • Low Hydraulic Fluid Level: If the hydraulic fluid is low, it can prevent the system from achieving proper pressure, leading to erratic movements such as creeping.
     
   • Hydraulic Fluid Contamination: Contaminated hydraulic fluid, due to dirt or moisture, can affect the performance of the hydraulic pump and valves, causing irregular pressure that results in creeping.
     
   • Hydraulic Pump or Valve Malfunction: A malfunction in the hydraulic pump or hydraulic valve could cause the flow of fluid to be unregulated, resulting in the machine moving when it shouldn’t.
     
   • Solution: Check the hydraulic fluid levels and inspect for any signs of contamination or leaks. If the fluid is contaminated, change it and replace the filter. If the issue persists, inspect the hydraulic pump and valves for malfunctions.
     
2. Control Lever and Linkage Problems
   The control lever in the ASV RC 60 is designed to manage both the forward and reverse motions. If the linkage between the control lever and the transmission is worn or misaligned, the machine could fail to reach the neutral position properly, resulting in creeping.
   • Solution: Inspect the control lever linkage for wear or misalignment. Ensure that the linkage is functioning smoothly and that there’s no excessive play in the system. Lubricate the components as needed and replace any worn parts.
     
3. Hydrostatic Transmission Issues
   The ASV RC 60 utilizes a hydrostatic transmission system, which uses hydraulic pressure to drive the wheels. A malfunction in the transmission system—such as a faulty hydrostatic pump or control valve—can lead to creeping by preventing the system from achieving true neutral.
   • Solution: Inspect the hydrostatic transmission for any issues, paying particular attention to the control valve and hydrostatic pump. If either component is faulty, they may need to be repaired or replaced.
     
4. Throttle or Throttle Linkage Malfunctions
   A malfunctioning throttle or throttle linkage can prevent the engine from idling properly, causing the machine to creep even when the controls are set to neutral. This is especially common when the throttle linkage is out of adjustment, leading to incorrect engine RPMs.
   • Solution: Check the throttle linkage for proper adjustment and ensure that the throttle is operating smoothly. If the throttle is sticking or malfunctioning, it may need to be replaced or adjusted by a professional.
     
5. Brake Issues
   Sometimes, creeping can occur when the brake system is not fully engaging, allowing the tracks to slowly move when the controls are neutral. This can happen if there is an issue with the brake pads, hydraulic brake system, or the parking brake.
   • Solution: Inspect the brake system for proper engagement, including checking the brake pads and hydraulic components for wear or damage. Ensure that the parking brake is functioning properly and engaging when activated.
     

1. Check Hydraulic Fluid Levels
   • Ensure the hydraulic fluid is at the correct level and that there are no leaks in the system. Top off the fluid if necessary and check for signs of contamination. If the fluid is contaminated, drain it and replace it with fresh fluid.
     
2. Inspect the Control Lever and Linkages
   • Inspect the control lever and linkage system for wear or damage. Ensure that the lever is in the correct neutral position and that there’s no excessive play in the linkage. Lubricate the system as necessary.
     
3. Test the Hydrostatic Transmission
   • Check the operation of the hydrostatic transmission. Look for signs of improper fluid flow or erratic pressure. If the transmission is malfunctioning, it may need professional servicing or component replacement.
     
4. Check the Throttle and Linkage
   • Ensure that the throttle is functioning correctly and that the linkage is properly adjusted. If the engine RPMs are too high or if the throttle is sticking, it may need adjustment or repair.
     
5. Inspect the Brake System
   • Check the brake pads and hydraulic components for wear or damage. Make sure that the parking brake is fully engaging when activated, and that there are no issues with the brake system that might allow the machine to creep.
     
6. Perform a Test Run
   • After addressing any issues, take the ASV RC 60 for a test run to ensure that the creeping problem is resolved. Observe the machine at various speeds and in different directions to ensure it operates smoothly.
     

1. Regular Fluid Checks
   Ensure that hydraulic fluid levels are consistently maintained and that the fluid is changed at the recommended intervals. Clean hydraulic fluid is essential for smooth operation.
   
2. Routine Inspection of Linkages
   Periodically inspect the control lever and linkage system for signs of wear. Lubricate the components regularly to ensure smooth operation and prevent misalignment.
   
3. Hydraulic System Maintenance
   Regularly check the hydraulic pump, control valve, and other components for wear and tear. Replace any damaged components promptly to prevent performance issues.
   
4. Brake System Checks
   Inspect the brake system for proper function, including the parking brake and hydraulic components. Address any issues with the braking system promptly to prevent unintended movement.
   
5. Engine and Throttle Maintenance
   Perform routine checks of the throttle and its linkage. Ensure that the throttle is free of obstructions and that the linkage is properly adjusted for correct idle speeds.
   

Maintaining a loader in optimal condition is essential for any construction or heavy equipment operation. Tires are among the most crucial components, bearing the load and enduring the rough terrain that loaders often navigate. The repair and installation of loader tires may seem like a straightforward task, but there are several important steps and considerations to ensure that the process goes smoothly, maintaining both safety and efficiency.
Understanding Loader Tires and Their Importance
Loader tires are designed to handle the tough demands of construction sites, mining operations, and material handling. These tires are generally built with heavy-duty materials to resist punctures, wear, and degradation caused by frequent contact with rough surfaces.
The tires on a loader serve multiple purposes:

• Load Support: They carry the entire weight of the loader and its load.
  
• Traction: Tires provide the necessary grip for the loader to maneuver and operate on various surfaces.
  
• Shock Absorption: They absorb the shock and vibration from the ground, ensuring smooth operation.
  

• Punctures and Cuts: Sharp objects like rocks or debris can puncture tires, leading to air loss or structural damage.
  
• Tread Wear: Over time, the tread on tires wears down, reducing traction and stability, especially on slippery or uneven surfaces.
  
• Deformation: Exposure to extreme temperatures, overloading, or improper inflation can cause tires to lose their shape, leading to problems with handling.
  
• Cracks: Tires can develop cracks due to prolonged exposure to UV light, chemical damage, or age.
  

• Wear Safety Gear: Protective gloves, goggles, and steel-toe boots should be worn to safeguard against accidents.
  
• Secure the Loader: Use wheel chocks and ensure the loader is on a stable surface. Engage the parking brake to prevent any movement during the process.
  
• Lift the Loader: Use a jack or lift to raise the loader off the ground. Make sure the loader is stable before proceeding.
  

• A lug wrench or impact wrench
  
• A jack or lift (to raise the loader)
  
• A tire iron or pry bar (if the tire is difficult to remove)
  

• Lift the Loader: Position the jack underneath the axle and lift the loader high enough to remove the tire. Make sure the loader is securely raised before proceeding.
  
• Loosen the Lug Nuts: Use a lug wrench or impact wrench to loosen the lug nuts, but do not completely remove them yet. Loosening them while the tire is still partially on the ground can prevent excessive strain on your tools.
  
• Remove the Lug Nuts: Once the lug nuts are loose, fully remove them and set them aside for later reinstallation.
  
• Remove the Tire: With the lug nuts removed, carefully pull the tire off the rim. Depending on the condition of the tire, it may require some force or use of a pry bar. If the tire is stuck, inspect the rim to ensure there is no debris obstructing its removal.
  

• Tire Inspection: Check for punctures, cuts, worn-out tread, or any deformities that may have occurred during use. If the tire is beyond repair, it should be replaced.
  
• Rim Inspection: Examine the rim for cracks, rust, or deformation. A damaged rim will need to be replaced to ensure proper installation of the new tire.
  

• Position the New Tire: Place the new tire onto the rim, making sure it is seated evenly.
  
• Lubricate the Beads: Use a rubber-compatible lubricant or soapy water to lubricate the tire beads (the part of the tire that touches the rim). This helps the tire seat properly during installation.
  
• Align the Holes: Align the holes on the tire with the holes on the rim.
  
• Install the Lug Nuts: Begin hand-tightening the lug nuts onto the wheel bolts. Once all nuts are in place, use a torque wrench to tighten them to the manufacturer’s recommended specifications. This ensures the tire is properly secured and avoids over-tightening, which could cause damage.
  
• Lower the Loader: Once the tire is securely in place, slowly lower the loader back to the ground. Double-check that all nuts are tightened correctly.
  

• Inflate the Tire: Ensure that the tire is inflated to the proper pressure. Over-inflated or under-inflated tires can cause handling issues and reduce the lifespan of the tire.
  
• Test the Loader: Start the loader and perform a few maneuvers to ensure the tire is functioning properly and the loader is stable.
  

• Regularly Inspect Tires: Regularly check for signs of wear, punctures, and damage to ensure that tires remain in good condition.
  
• Proper Inflation: Keep the tire pressure at the recommended level. Both over-inflation and under-inflation can lead to excessive wear and tear.
  
• Use the Right Tires for the Job: Make sure you're using the appropriate tire type for your operating conditions. Some tires are designed for specific surfaces (e.g., rough terrain or paved surfaces), and using the wrong type can lead to premature wear.
  
• Avoid Overloading: Overloading your loader places unnecessary stress on the tires and can cause them to wear out prematurely.
  

The 1966 Ford F850 dump truck is a classic example of mid-20th-century American heavy-duty machinery. Built to handle tough jobs like hauling construction materials and earthmoving tasks, these trucks have proven their worth on job sites for decades. However, like any vintage piece of machinery, the F850 can run into issues as it ages, and it's crucial to maintain and troubleshoot it properly to keep it running smoothly. In this article, we’ll explore common issues with the 1966 Ford F850 dump truck, provide troubleshooting advice, and offer tips for preserving this iconic machine for continued use.
Common Issues with the 1966 Ford F850 Dump Truck
As a truck that was manufactured more than 50 years ago, the 1966 Ford F850 has undoubtedly undergone significant wear and tear. A variety of common issues may arise, especially when the truck is being used in demanding environments.

1. Engine Performance Problems
   One of the most significant issues with older vehicles, including the F850, is related to engine performance. Over time, parts wear out, and the engine may start to run rough, lose power, or even stall unexpectedly. Common causes of engine issues include:
   • Carburetor Problems: The carburetor is a critical component for controlling the engine's air-fuel mixture. Over time, it can become clogged, dirty, or misadjusted, causing rough idling, backfiring, or stalling.
     
   • Ignition System Failure: Faulty spark plugs, ignition wires, or the ignition coil could lead to poor engine performance or difficulty starting the truck.
     
   • Solution: Regularly clean and maintain the carburetor, replacing worn parts as needed. Inspect and replace spark plugs and ignition wires at recommended intervals.
     
2. Transmission and Drivetrain Issues
   The F850 dump truck uses a manual transmission and a traditional drivetrain, which can experience problems due to prolonged use. Transmission slipping, difficulty shifting gears, or strange noises are common complaints from operators.
   • Clutch Problems: If the truck struggles to shift gears or if the clutch feels "spongy," this could be a sign of clutch wear or air in the hydraulic clutch system.
     
   • Transmission Fluid Leaks: Leaking transmission fluid can cause shifting issues and even gearbox failure if left unresolved.
     
   • Solution: Check the clutch and hydraulic system for leaks or air, and replace the fluid regularly. If the clutch is worn, it may need to be replaced entirely.
     
3. Brake System Failures
   Brakes are crucial for safe operation, especially for a dump truck that carries heavy loads. Over time, brake components like brake shoes, drums, and hydraulic lines can wear out or corrode.
   • Worn Brake Pads/Shoes: If the truck has trouble stopping or the brakes squeal, the brake pads or shoes might need replacement.
     
   • Air Brake Issues: The F850 might also feature air brakes, and issues such as air leaks, poor pressure, or faulty valves can lead to brake failure.
     
   • Solution: Perform regular inspections of the brake system and replace worn components immediately. For air brakes, ensure that the system is properly pressurized and that there are no leaks in the lines.
     
4. Electrical System Failures
   The F850’s electrical system is another area prone to failure over time. Wiring, switches, and lights are susceptible to wear, and older electrical systems may develop short circuits or lose connectivity.
   • Dead Battery or Alternator Issues: A dead battery, malfunctioning alternator, or corroded battery terminals can result in the truck failing to start or electrical components not functioning properly.
     
   • Faulty Wiring or Fuses: Given the age of the truck, some wiring may have frayed or become corroded, leading to faulty electrical connections or blown fuses.
     
   • Solution: Regularly check the battery for corrosion and ensure it's charging correctly. Inspect wiring for damage and replace fuses as needed.
     

1. Start with the Basics
   • Check the battery for corrosion and ensure that it’s holding a charge.
     
   • Inspect spark plugs and ignition wires for wear.
     
   • Look for fuel leaks or fuel system issues, such as a clogged fuel filter or carburetor.
     
2. Check Fluid Levels and Conditions
   • Ensure that all critical fluids—engine oil, transmission fluid, hydraulic fluid, brake fluid—are at proper levels.
     
   • Look for fluid leaks that might indicate a more severe issue with seals, hoses, or gaskets.
     
3. Inspect the Clutch and Transmission
   • Test the clutch pedal for proper engagement and feel. A worn clutch may cause the truck to slip out of gear or be difficult to shift.
     
   • Check for transmission fluid leaks around seals and gaskets.
     
4. Test the Brake System
   • Perform a brake fluid check and look for signs of leaks or worn brake pads.
     
   • For air brakes, check the compressor and air lines for leaks, and ensure the system holds pressure.
     
5. Examine the Electrical System
   • Look for worn or frayed wiring and connections. Replace or repair any faulty wiring.
     
   • Test the alternator and starter motor to ensure proper charging and starting operation.
     
6. Perform Regular Maintenance
   • Keep the truck clean, as accumulated dirt and grime can hide potential issues.
     
   • Perform preventive maintenance based on the recommended service intervals in the truck’s owner’s manual.
     

The John Deere 35C, a compact hydraulic excavator, is a valuable asset for many construction professionals. It combines power, precision, and versatility, making it ideal for small to medium-sized projects. However, like all machinery, it can experience issues over time. One of the most common problems reported by operators of the John Deere 35C is hydraulic failure or poor hydraulic performance. Whether you're dealing with low pressure, slow response, or a complete loss of function, understanding the hydraulic system and its components is essential for troubleshooting.
Understanding the Hydraulic System
Hydraulic systems are at the heart of many of the John Deere 35C's operations. The excavator uses hydraulic power for everything from boom and arm movements to bucket control. Hydraulic fluid is pumped through the system, and this fluid pressure drives pistons to perform specific tasks.
The major components of the hydraulic system in the John Deere 35C include:

• Hydraulic Pumps: These provide the necessary pressure to the system.
  
• Hydraulic Fluid: Essential for transferring power through the system.
  
• Control Valves: Direct hydraulic fluid to different parts of the system depending on the operator's input.
  
• Hydraulic Cylinders: These use hydraulic pressure to create linear motion in the machine’s components.
  

1. Low Hydraulic Pressure
   Low hydraulic pressure is one of the most frequent issues reported by operators of the John Deere 35C. When hydraulic pressure is insufficient, the excavator's movements become slow or unresponsive.
   Possible Causes and Solutions:
   • Low Hydraulic Fluid Level: One of the first things to check is the hydraulic fluid level. If it’s low, the pump will have trouble generating the required pressure. Check the fluid levels and top up with the recommended hydraulic oil.
     
   • Clogged Filters: Over time, hydraulic filters can become clogged with dirt and debris, restricting fluid flow and reducing pressure. Regularly check and replace the filters to ensure smooth operation.
     
   • Worn Hydraulic Pump: A failing hydraulic pump is a common cause of low pressure. If the pump is worn out, it might not be able to maintain the necessary pressure. Replacing the pump may be required if it is the root cause.
     
   • Air in the Hydraulic System: Air can enter the hydraulic system if the seals on the pump or lines fail. Air in the system leads to inconsistent pressure and can damage the components. Bleeding the system to remove any air is necessary in such cases.
     
2. Slow or Unresponsive Movements
   If the John Deere 35C is slow to respond or its movements are jerky, there could be an issue with the control valves or the hydraulic fluid.
   Possible Causes and Solutions:
   • Sticky or Faulty Control Valves: The control valves are responsible for directing hydraulic fluid to the correct part of the system. If the valves become dirty or worn, they may fail to direct fluid correctly, leading to slow or erratic movements. Cleaning or replacing the control valves should address this issue.
     
   • Hydraulic Fluid Quality: The type and quality of hydraulic fluid used in the system can also impact performance. Ensure that you’re using the right fluid as recommended by John Deere. Poor-quality fluid can thicken or degrade over time, hindering fluid flow and causing sluggish movements.
     
   • Pump Efficiency: A failing pump may not generate enough pressure to move the hydraulic cylinders efficiently. This may require a complete pump replacement.
     
3. Leaks in the Hydraulic System
   Hydraulic leaks are often visible as puddles or stains under the machine. Leaks can cause a drop in fluid levels, leading to decreased hydraulic pressure and poor performance.
   Possible Causes and Solutions:
   • Damaged Hoses or Fittings: Check all hydraulic hoses for signs of wear, cracks, or leaks. Tighten or replace any loose or damaged fittings.
     
   • Worn Seals: Over time, seals can degrade and allow hydraulic fluid to escape. Inspect the seals on pumps, cylinders, and hoses, and replace them as needed.
     
4. No Movement or Complete Hydraulic Failure
   In some cases, the hydraulic system may fail entirely, preventing any movement in the machine. This is a serious issue that should be addressed immediately.
   Possible Causes and Solutions:
   • Completely Empty Hydraulic System: If the hydraulic fluid is completely empty or the pump fails, the system won’t be able to generate the necessary pressure. Check the fluid level and inspect the pump for failure.
     
   • Electrical or Sensor Failures: Modern machines, including the John Deere 35C, rely on electrical sensors to control various aspects of the hydraulic system. A failure in these sensors or wiring could prevent the hydraulic system from functioning. Diagnosing the electrical system for faults may be necessary.
     

• Check Hydraulic Fluid Levels: Regularly inspect the hydraulic fluid levels and top up as necessary. Make sure to use the correct type of hydraulic fluid as recommended by the manufacturer.
  
• Replace Filters: Clean or replace hydraulic filters regularly to prevent clogging and ensure proper fluid flow.
  
• Inspect Hoses and Fittings: Routinely check hydraulic hoses and fittings for wear and leaks. Repair or replace them as needed.
  
• Test Hydraulic Pressure: If you notice any performance issues, consider using a pressure gauge to test the hydraulic pressure. This can help you determine if the pump or other components are functioning properly.
  
• Hydraulic Fluid Quality: Keep an eye on the quality of the hydraulic fluid. Replace it if it has become contaminated or degraded.