Troubleshooting Common Issues with the CAT 259B Skid Steer

[MikePhua]

The Caterpillar 259B is a powerful and versatile skid steer loader that is highly regarded in the construction and heavy equipment industries. Known for its compact size and high lifting capabilities, the 259B has become a popular choice for contractors and operators working in tight spaces or on small to medium-sized projects. However, like any piece of heavy equipment, the 259B can encounter issues over time, especially when it's overworked, improperly maintained, or exposed to harsh conditions.
In this article, we’ll explore common problems that operators might face with the CAT 259B, as well as troubleshooting tips and solutions to help keep this machine running smoothly.
Understanding the CAT 259B Skid Steer
The CAT 259B is a radial lift skid steer loader equipped with a 74-horsepower engine, capable of lifting and carrying heavy loads with its hydraulically powered arms. Its operating weight is approximately 6,500 pounds (2,948 kg), making it a mid-range skid steer that is both powerful and maneuverable. The machine is designed for tasks such as digging, lifting, and material handling, and it comes with various attachments for different job requirements, including buckets, forks, and augers.
The 259B features a vertical lift path, which provides greater reach when lifting materials. It has a maximum operating capacity of 2,250 pounds (1,020 kg), and its hydraulic system can deliver impressive performance for a variety of tasks. However, as with any machine, problems can arise, and operators should know how to troubleshoot and resolve issues.
Common Issues with the CAT 259B
Over the years, several operators have reported recurring issues with the CAT 259B skid steer, including hydraulic problems, electrical failures, and mechanical malfunctions. Below are some of the most common issues faced by operators of the 259B.
1. Hydraulic Problems
Hydraulic issues are among the most common complaints from CAT 259B operators. The hydraulic system is essential for the proper functioning of the loader arms, steering, and attachments, and any issue with this system can cause performance problems.

• Symptom: Slow or weak hydraulic performance
  • Possible Causes: Low hydraulic fluid levels, contaminated hydraulic fluid, air in the hydraulic lines, or a malfunctioning hydraulic pump.
    
  • Solution: First, check the hydraulic fluid level and ensure it is clean and at the correct level. If the fluid is dirty or contaminated, replace it with the manufacturer’s recommended fluid. Bleed the hydraulic system to remove air, and inspect the hydraulic pump and hoses for leaks or damage. If necessary, replace the hydraulic pump.
    
• Symptom: Hydraulic fluid leaks
  • Possible Causes: Worn or damaged seals, hoses, or fittings.
    
  • Solution: Inspect the hydraulic system for visible leaks. Look for damaged or cracked hoses, and replace them as needed. Check the seals around cylinders and valves, and replace them if they show signs of wear.
    

2. Engine Performance Issues
Engine-related issues can severely affect the performance of the 259B, resulting in slower operation, stalling, or reduced power.

• Symptom: Engine not starting or stalling
  • Possible Causes: Weak battery, fuel system issues, or electrical malfunctions.
    
  • Solution: Begin by checking the battery’s voltage and ensuring that the terminals are clean and tightly connected. If the battery is old or weak, it may need to be replaced. Inspect the fuel lines and filter for blockages or contamination. If the fuel system is compromised, the fuel filter or pump may need replacement.
    
• Symptom: Loss of power or engine misfire
  • Possible Causes: Clogged fuel injectors, dirty air filters, or low compression.
    
  • Solution: Replace the air filter if it’s clogged or dirty. Clean or replace the fuel injectors to ensure the engine is receiving the correct amount of fuel. Perform a compression test to check the engine’s overall health, and replace worn parts as necessary.
    

3. Electrical Issues
The electrical system on the CAT 259B controls many aspects of the machine’s performance, including the ignition, sensors, and lights. Problems with the electrical system can result in operational issues or even complete failure.

• Symptom: Electrical system failure or intermittent operation
  • Possible Causes: Faulty wiring, blown fuses, or a malfunctioning alternator.
    
  • Solution: Inspect all wiring connections for corrosion or loose connections. Check the alternator’s output to ensure it’s charging the battery properly. Replace any blown fuses, and test the battery to confirm it’s holding a charge. If the alternator is faulty, it will need to be replaced.
    
• Symptom: Warning lights or gauges malfunctioning
  • Possible Causes: Faulty sensors or wiring issues.
    
  • Solution: Inspect the sensors that control the gauges and warning lights. If any sensor is faulty or damaged, it should be replaced. Additionally, check the wiring to ensure that there are no shorts or open circuits.
    

4. Steering and Drive Issues
The 259B is equipped with a hydrostatic drive system, which is responsible for providing smooth and responsive steering and drive capabilities. Problems in this system can result in difficulty maneuvering the skid steer or an unresponsive drive.

• Symptom: Skid steer not responding to steering commands
  • Possible Causes: Low hydraulic fluid, worn steering pump, or malfunctioning hydraulic valves.
    
  • Solution: Ensure that the hydraulic fluid is at the correct level and is clean. Check the steering pump for proper operation and replace it if necessary. Inspect the hydraulic valves for any signs of malfunction or blockage, and replace them if needed.
    
• Symptom: Loss of traction or uneven drive power
  • Possible Causes: Worn drive motors, damaged axles, or damaged tires.
    
  • Solution: Inspect the drive motors for wear and ensure they are functioning properly. Check the axles for any signs of damage or excessive play. Inspect the tires for wear or punctures and replace them as needed.
    

5. Overheating Issues
Overheating can occur in the CAT 259B if the cooling system is not functioning properly, leading to engine damage or failure.

• Symptom: Engine overheating or excessive heat buildup
  • Possible Causes: Low coolant levels, clogged radiator, or malfunctioning water pump.
    
  • Solution: Check the coolant levels and top them off if needed. Inspect the radiator for any blockages, such as dirt or debris, and clean it thoroughly. If the water pump is malfunctioning, it will need to be replaced.
    

Preventative Maintenance for the CAT 259B
Regular maintenance is key to preventing many of the issues outlined above and ensuring the long-term health of the CAT 259B skid steer. Here are some basic maintenance tips:

1. Regular Fluid Checks: Check the hydraulic fluid, engine oil, coolant, and fuel levels at regular intervals. Replace fluids as recommended by the manufacturer.
   
2. Clean Filters: Replace or clean air, fuel, and hydraulic filters regularly to ensure the engine and hydraulic systems are functioning optimally.
   
3. Inspect Tires and Tracks: Check for wear and tear on tires and tracks. Replace them if they are damaged or worn beyond repair.
   
4. Lubricate Moving Parts: Regularly grease the machine’s moving parts, including the loader arms and bucket, to prevent friction and ensure smooth operation.
   
5. Keep the Radiator Clean: Clean the radiator and cooling system to prevent overheating.
   

Conclusion
The CAT 259B is a reliable and powerful skid steer, but like any heavy equipment, it requires regular maintenance and occasional troubleshooting to keep it operating at its best. By understanding the common issues, such as hydraulic problems, engine performance issues, and electrical malfunctions, operators can take proactive steps to maintain the skid steer and address problems before they lead to costly repairs. With proper care, the CAT 259B can continue to deliver exceptional performance on the job site for many years.