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The Gehl 6635SXT is a highly versatile and durable skid steer loader that is commonly used in a variety of construction, landscaping, and agricultural applications. Known for its powerful hydraulics, the Gehl 6635SXT can handle a wide range of attachments and tasks. However, like all machines, it can sometimes face technical issues that may hinder its operation. One of the most common and concerning problems that operators encounter is a complete loss of hydraulic function.
When the hydraulics fail to work, it renders the machine nearly useless, as most of its operations are hydraulically powered. This article will explore the potential causes of hydraulic failure in the Gehl 6635SXT and provide detailed troubleshooting steps to help diagnose and resolve the issue.
Understanding the Hydraulic System of the Gehl 6635SXT
Before diving into potential causes and solutions, it’s important to understand the role of the hydraulic system in the Gehl 6635SXT. The hydraulics in this machine control the lifting and tilting of the arms, the movement of the attachments, and the propulsion of the machine itself. Hydraulics operate by converting engine power into pressurized fluid, which then drives the hydraulic cylinders that perform these tasks.
The hydraulic system is made up of several key components:
Common Causes of Hydraulic Failure in the Gehl 6635SXT
There are several potential reasons why the hydraulics on the Gehl 6635SXT might stop functioning. Below are the most common causes:
1. Low Hydraulic Fluid Levels
Hydraulic fluid is essential for the smooth operation of the system. If the fluid level is low, the pump cannot generate sufficient pressure, leading to a loss of hydraulic function. This is one of the easiest issues to check and is often caused by leaks or overuse of the fluid.
2. Contaminated Hydraulic Fluid
Over time, hydraulic fluid can become contaminated with dirt, metal particles, or other debris. This contamination can cause clogs in the filters and damage to the internal components of the hydraulic system. Contaminated fluid can severely affect the efficiency of the system and cause total hydraulic failure.
3. Faulty Hydraulic Pump
The hydraulic pump is the heart of the system, and if it fails, the entire hydraulic system will cease to function. Hydraulic pump failure can occur due to wear and tear, lack of proper maintenance, or fluid contamination. A damaged pump will often make unusual noises or produce inconsistent pressure.
4. Hydraulic Hose Leaks or Damage
Hydraulic hoses carry fluid under high pressure. If any hoses become cracked, worn, or damaged, they can leak fluid, causing a loss of pressure throughout the system. Leaks are often the result of wear, abrasions, or accidental damage from external sources.
5. Faulty Hydraulic Valve
Hydraulic valves control the direction and flow of the hydraulic fluid. If a valve becomes stuck, blocked, or damaged, it may prevent fluid from reaching the necessary components. This could result in partial or complete hydraulic failure.
6. Hydraulic Filter Clogs
Hydraulic filters prevent contaminants from circulating through the system. Over time, filters can become clogged with debris, preventing fluid from flowing properly. This can lead to overheating, pressure drops, or complete loss of hydraulic function.
7. Electrical Issues (For Electric-Hydraulic Models)
For some Gehl models, certain hydraulic components are electrically controlled. A failure in the electrical system—such as a blown fuse, faulty wiring, or issues with the solenoids—can prevent the hydraulics from engaging.
Troubleshooting Steps for Hydraulic Failure
To diagnose and resolve the issue of no hydraulics on the Gehl 6635SXT, follow these systematic troubleshooting steps:
Step 1: Check Hydraulic Fluid Levels
The first and easiest step is to check the hydraulic fluid levels. Open the hydraulic reservoir cap and ensure the fluid is at the recommended level. If the fluid is low, top it up with the appropriate type of hydraulic fluid specified in the operator’s manual. Be sure to also check for any visible signs of leakage around the hoses, valves, and reservoir.
Step 2: Inspect the Fluid for Contamination
If the fluid levels are fine, check the quality of the hydraulic fluid. It should be a clear amber color. If the fluid is dark, milky, or contains visible debris, it needs to be replaced. Contaminated fluid can damage the hydraulic pump and other components, leading to further issues down the line.
Step 3: Examine the Hydraulic Pump
If the fluid is clean and at the right level, the next step is to inspect the hydraulic pump. Check for any signs of damage or wear on the pump. Listen for any unusual noises coming from the pump, which could indicate internal damage. If the pump is not functioning correctly, it will need to be replaced.
Step 4: Inspect Hydraulic Hoses and Lines
Next, check the hydraulic hoses and lines for any signs of damage or leaks. Look for cracks, abrasions, or areas where the hoses may have become disconnected. Repair or replace any damaged hoses.
Step 5: Check the Hydraulic Filter
Inspect the hydraulic filter to see if it is clogged. A clogged filter can prevent proper fluid flow, so if the filter appears dirty or blocked, it should be replaced. Be sure to also clean or replace the filter housing.
Step 6: Test the Hydraulic Valves
If the fluid and pump appear to be fine, check the hydraulic valves. Ensure that they are not stuck in a closed position or obstructed by dirt or debris. If the valves are not functioning properly, they may need to be cleaned or replaced.
Step 7: Inspect Electrical Components
If your model uses electric-hydraulic components, check the electrical system for issues such as blown fuses, damaged wiring, or faulty solenoids. Use a multimeter to check for continuity and voltage to ensure that the electrical components are receiving power.
Solutions and Preventive Maintenance
Once you’ve identified the cause of the hydraulic failure, apply the appropriate solution:
To prevent future hydraulic failures and ensure the longevity of your Gehl 6635SXT, follow these maintenance tips:
Hydraulic failure in the Gehl 6635SXT can be caused by various issues, ranging from low fluid levels to damaged pumps or hoses. By following a systematic troubleshooting approach, operators can quickly identify and resolve these problems, ensuring the machine continues to operate smoothly. Regular maintenance and prompt repairs are key to extending the lifespan of the hydraulic system and keeping the loader running at peak performance.
When the hydraulics fail to work, it renders the machine nearly useless, as most of its operations are hydraulically powered. This article will explore the potential causes of hydraulic failure in the Gehl 6635SXT and provide detailed troubleshooting steps to help diagnose and resolve the issue.
Understanding the Hydraulic System of the Gehl 6635SXT
Before diving into potential causes and solutions, it’s important to understand the role of the hydraulic system in the Gehl 6635SXT. The hydraulics in this machine control the lifting and tilting of the arms, the movement of the attachments, and the propulsion of the machine itself. Hydraulics operate by converting engine power into pressurized fluid, which then drives the hydraulic cylinders that perform these tasks.
The hydraulic system is made up of several key components:
- Hydraulic Pump: This component takes mechanical power from the engine and converts it into hydraulic pressure.
- Hydraulic Reservoir: This stores the hydraulic fluid, which is used throughout the system.
- Hydraulic Hoses and Lines: These carry the hydraulic fluid to various components.
- Hydraulic Cylinders: These are responsible for the movement of the loader’s arms, as well as the operation of attachments.
- Control Valves: These regulate the flow of hydraulic fluid to the cylinders, controlling their movement.
Common Causes of Hydraulic Failure in the Gehl 6635SXT
There are several potential reasons why the hydraulics on the Gehl 6635SXT might stop functioning. Below are the most common causes:
1. Low Hydraulic Fluid Levels
Hydraulic fluid is essential for the smooth operation of the system. If the fluid level is low, the pump cannot generate sufficient pressure, leading to a loss of hydraulic function. This is one of the easiest issues to check and is often caused by leaks or overuse of the fluid.
2. Contaminated Hydraulic Fluid
Over time, hydraulic fluid can become contaminated with dirt, metal particles, or other debris. This contamination can cause clogs in the filters and damage to the internal components of the hydraulic system. Contaminated fluid can severely affect the efficiency of the system and cause total hydraulic failure.
3. Faulty Hydraulic Pump
The hydraulic pump is the heart of the system, and if it fails, the entire hydraulic system will cease to function. Hydraulic pump failure can occur due to wear and tear, lack of proper maintenance, or fluid contamination. A damaged pump will often make unusual noises or produce inconsistent pressure.
4. Hydraulic Hose Leaks or Damage
Hydraulic hoses carry fluid under high pressure. If any hoses become cracked, worn, or damaged, they can leak fluid, causing a loss of pressure throughout the system. Leaks are often the result of wear, abrasions, or accidental damage from external sources.
5. Faulty Hydraulic Valve
Hydraulic valves control the direction and flow of the hydraulic fluid. If a valve becomes stuck, blocked, or damaged, it may prevent fluid from reaching the necessary components. This could result in partial or complete hydraulic failure.
6. Hydraulic Filter Clogs
Hydraulic filters prevent contaminants from circulating through the system. Over time, filters can become clogged with debris, preventing fluid from flowing properly. This can lead to overheating, pressure drops, or complete loss of hydraulic function.
7. Electrical Issues (For Electric-Hydraulic Models)
For some Gehl models, certain hydraulic components are electrically controlled. A failure in the electrical system—such as a blown fuse, faulty wiring, or issues with the solenoids—can prevent the hydraulics from engaging.
Troubleshooting Steps for Hydraulic Failure
To diagnose and resolve the issue of no hydraulics on the Gehl 6635SXT, follow these systematic troubleshooting steps:
Step 1: Check Hydraulic Fluid Levels
The first and easiest step is to check the hydraulic fluid levels. Open the hydraulic reservoir cap and ensure the fluid is at the recommended level. If the fluid is low, top it up with the appropriate type of hydraulic fluid specified in the operator’s manual. Be sure to also check for any visible signs of leakage around the hoses, valves, and reservoir.
Step 2: Inspect the Fluid for Contamination
If the fluid levels are fine, check the quality of the hydraulic fluid. It should be a clear amber color. If the fluid is dark, milky, or contains visible debris, it needs to be replaced. Contaminated fluid can damage the hydraulic pump and other components, leading to further issues down the line.
Step 3: Examine the Hydraulic Pump
If the fluid is clean and at the right level, the next step is to inspect the hydraulic pump. Check for any signs of damage or wear on the pump. Listen for any unusual noises coming from the pump, which could indicate internal damage. If the pump is not functioning correctly, it will need to be replaced.
Step 4: Inspect Hydraulic Hoses and Lines
Next, check the hydraulic hoses and lines for any signs of damage or leaks. Look for cracks, abrasions, or areas where the hoses may have become disconnected. Repair or replace any damaged hoses.
Step 5: Check the Hydraulic Filter
Inspect the hydraulic filter to see if it is clogged. A clogged filter can prevent proper fluid flow, so if the filter appears dirty or blocked, it should be replaced. Be sure to also clean or replace the filter housing.
Step 6: Test the Hydraulic Valves
If the fluid and pump appear to be fine, check the hydraulic valves. Ensure that they are not stuck in a closed position or obstructed by dirt or debris. If the valves are not functioning properly, they may need to be cleaned or replaced.
Step 7: Inspect Electrical Components
If your model uses electric-hydraulic components, check the electrical system for issues such as blown fuses, damaged wiring, or faulty solenoids. Use a multimeter to check for continuity and voltage to ensure that the electrical components are receiving power.
Solutions and Preventive Maintenance
Once you’ve identified the cause of the hydraulic failure, apply the appropriate solution:
- Refill or Replace Hydraulic Fluid: If fluid levels are low or contaminated, top up with the correct hydraulic fluid or perform a complete fluid change.
- Replace the Hydraulic Pump: If the pump is found to be faulty, it will need to be replaced with a new or refurbished pump.
- Repair or Replace Damaged Hoses: Damaged hydraulic hoses should be repaired or replaced to restore full pressure to the system.
- Replace Clogged Filters: Replace dirty or clogged hydraulic filters to allow fluid to flow freely throughout the system.
- Repair or Replace Faulty Valves: Clean or replace hydraulic control valves to ensure proper fluid flow and pressure regulation.
- Fix Electrical Issues: Repair any electrical faults in the system, such as replacing faulty wiring, fuses, or solenoids.
To prevent future hydraulic failures and ensure the longevity of your Gehl 6635SXT, follow these maintenance tips:
- Regularly check hydraulic fluid levels and replace it as necessary to prevent contamination.
- Clean or replace hydraulic filters as part of routine maintenance to avoid blockages.
- Inspect hydraulic hoses and lines regularly for wear and tear.
- Flush the hydraulic system periodically to remove contaminants and maintain optimal fluid flow.
- Perform routine checks on the hydraulic pump and valves to catch potential issues before they cause major problems.
Hydraulic failure in the Gehl 6635SXT can be caused by various issues, ranging from low fluid levels to damaged pumps or hoses. By following a systematic troubleshooting approach, operators can quickly identify and resolve these problems, ensuring the machine continues to operate smoothly. Regular maintenance and prompt repairs are key to extending the lifespan of the hydraulic system and keeping the loader running at peak performance.
