Bobcat 773: Common Issues and Solutions for Optimal Performance

[MikePhua]

The Bobcat 773 is one of the most widely used skid-steer loaders in the world, valued for its power, maneuverability, and versatility. However, like any piece of heavy equipment, the 773 can experience issues that require troubleshooting and maintenance. Understanding these issues, how to diagnose them, and implementing proper solutions can help extend the lifespan of the machine and ensure it operates at peak efficiency. In this article, we will explore common problems with the Bobcat 773, their causes, and solutions, offering a comprehensive guide to keeping the machine in top shape.
Overview of the Bobcat 773
The Bobcat 773 is part of Bobcat’s Series 700 skid-steer loader family, offering excellent lifting capacities, compact size, and robust hydraulic systems. It is designed for a wide range of tasks, from landscaping and construction to agriculture and material handling. With an operating weight of around 5,000 pounds, it strikes a balance between size and power, making it versatile for tight workspaces while still providing substantial lifting power.
Despite its reliability, users occasionally face mechanical and operational issues with the 773. Many of these problems can be addressed through proper troubleshooting, part replacement, and regular maintenance. Below are some of the most common issues owners of the Bobcat 773 face, along with their potential causes and solutions.
Common Issues and Troubleshooting Tips for the Bobcat 773

1. Hydraulic System Problems
   Symptoms: Slow or weak lift, bucket movement issues, or complete loss of hydraulic power.
   Causes:
   • Low Hydraulic Fluid: Insufficient hydraulic fluid can cause the system to malfunction, resulting in weak or unresponsive movements.
     
   • Clogged Filters: Dirty or clogged filters prevent proper fluid flow, restricting the hydraulic system's performance.
     
   • Damaged Hydraulic Hoses or Connections: Leaks or cracks in hoses and fittings can cause a drop in pressure, leading to poor hydraulic performance.
     
   Solutions:
   • Check Fluid Levels: Regularly check the hydraulic fluid levels and top them off as needed with the appropriate fluid.
     
   • Replace Filters: Change the hydraulic filters on a regular basis, as recommended by the manufacturer. Dirty filters can impede the system’s flow and performance.
     
   • Inspect for Leaks: Examine hydraulic hoses and connections for any signs of leakage. If leaks are found, replace the damaged hoses or fittings.
     
2. Engine Starting Problems
   Symptoms: Difficulty starting the engine, engine cranks but doesn't start, or the machine completely fails to start.
   Causes:
   • Weak Battery: A discharged or old battery can cause starting issues, especially in cold weather.
     
   • Fuel System Issues: Problems in the fuel system, such as a clogged fuel filter or air in the lines, can prevent the engine from starting.
     
   • Ignition System Failure: Malfunctioning spark plugs, ignition switches, or relays can prevent the engine from firing properly.
     
   Solutions:
   • Test and Replace the Battery: Check the battery voltage with a multimeter. If it is below 12 volts, recharge or replace the battery.
     
   • Check the Fuel System: Inspect the fuel filter for blockages, and replace it if needed. Ensure that the fuel lines are clear and free of air pockets.
     
   • Inspect the Ignition System: Test the spark plugs, ignition switch, and relays for proper functionality. Replace faulty components to restore proper starting.
     
3. Transmission Issues
   Symptoms: Difficulty moving the machine, strange noises from the transmission, or slipping of gears.
   Causes:
   • Low Transmission Fluid: Insufficient fluid in the transmission can lead to slipping gears and difficulty moving the skid-steer.
     
   • Worn or Damaged Transmission Components: Over time, components like the drive gears, belts, or the transmission pump can wear out, causing operational issues.
     
   • Clutch Problems: The clutch may be slipping or improperly adjusted, leading to difficulty engaging or disengaging gears.
     
   Solutions:
   • Check Transmission Fluid: Regularly check and maintain the correct fluid levels. If the fluid is low or dirty, replace it with the recommended transmission fluid.
     
   • Inspect Transmission Components: If the transmission is making unusual noises, have the system inspected by a professional mechanic to identify worn or damaged parts that need replacement.
     
   • Adjust or Replace Clutch: If the clutch is slipping, adjust it according to the manufacturer’s specifications. If the problem persists, the clutch may need to be replaced.
     
4. Overheating Issues
   Symptoms: Engine or hydraulic system overheating, with warning lights or beeping sounds from the machine.
   Causes:
   • Clogged Cooling System: Dirt, debris, or old coolant can accumulate in the radiator or cooling system, reducing its efficiency and causing the machine to overheat.
     
   • Low Coolant Levels: If the coolant levels are low, the engine can overheat, leading to engine failure or severe damage.
     
   • Faulty Thermostat or Cooling Fan: A malfunctioning thermostat or cooling fan can prevent proper temperature regulation, causing the engine to overheat.
     
   Solutions:
   • Inspect the Cooling System: Clean the radiator and cooling fins to remove any dirt or debris that may be obstructing airflow.
     
   • Check Coolant Levels: Ensure that the coolant is filled to the recommended levels. Top off or replace the coolant if necessary.
     
   • Replace Faulty Components: If the thermostat or fan isn’t working properly, have them inspected and replaced by a qualified technician.
     
5. Loader Arm Issues
   Symptoms: Loader arms not raising or lowering properly, slow movement, or uneven movement.
   Causes:
   • Hydraulic System Failure: If the hydraulic pump or valves are malfunctioning, the loader arms may not respond correctly.
     
   • Linkage or Pin Damage: Over time, the pins or linkages that control the movement of the loader arms may wear out or become damaged.
     
   • Load Imbalance: If the load in the bucket is not properly balanced, it can cause the loader arms to behave unpredictably.
     
   Solutions:
   • Check Hydraulic Function: Test the hydraulic system to ensure it’s working correctly. Replace any faulty components like the pump or valves.
     
   • Inspect the Linkage: Check for worn or damaged pins, bushings, and linkages in the loader arm mechanism. Replace any parts that show signs of wear.
     
   • Balance Loads Properly: Always ensure that the load in the bucket is evenly distributed to prevent undue strain on the loader arms.
     
6. Electrical System Malfunctions
   Symptoms: Electrical components, such as lights, horn, or gauges, not functioning correctly.
   Causes:
   • Corroded Connections: Over time, electrical connections can corrode, especially in the battery compartment, leading to poor conductivity and malfunctioning components.
     
   • Blown Fuses: A blown fuse can disrupt the power supply to certain electrical systems, leading to inoperable lights or displays.
     
   • Faulty Wiring: Damaged or frayed wires can cause shorts, leading to intermittent or complete electrical failure.
     
   Solutions:
   • Inspect and Clean Electrical Connections: Regularly check the battery terminals and electrical connections for corrosion. Clean or replace corroded connections to ensure proper electrical flow.
     
   • Replace Blown Fuses: Check the fuse box for blown fuses and replace them as needed. Refer to the owner’s manual for the correct fuse ratings.
     
   • Check for Damaged Wiring: Inspect the wiring for visible damage or wear. Repair or replace any damaged wires to restore proper function.
     

Regular Maintenance to Prevent Issues
To minimize the chances of encountering these problems, regular maintenance is key. Below are some routine tasks that can keep the Bobcat 773 running smoothly:

1. Change Hydraulic Fluid and Filters Regularly
   
2. Inspect and Clean the Air and Fuel Filters
   
3. Lubricate Moving Parts to Prevent Wear
   
4. Check Tire Pressure and Condition
   
5. Examine the Battery and Clean Terminals
   
6. Inspect the Engine and Transmission Fluid Levels
   
7. Replace Worn Out Components Promptly
   

Conclusion
The Bobcat 773 is a powerful and versatile skid-steer loader that can handle a variety of tasks, but like any piece of heavy machinery, it requires regular maintenance and attention. By staying on top of potential issues and performing routine inspections, you can ensure that the machine operates efficiently and lasts for years. Whether dealing with hydraulic, electrical, or mechanical problems, a well-maintained Bobcat 773 can serve as a reliable workhorse on your job site.