CAT 268B Drive and Steering Issues: A Comprehensive Troubleshooting Guide

[MikePhua]

The CAT 268B is a popular skid steer loader used in construction, landscaping, and agricultural applications. Known for its durability and versatile performance, this machine excels in a variety of tasks such as lifting, digging, and transporting materials. However, like any piece of heavy machinery, it can experience issues over time, particularly with the drive and steering systems. These problems can result in decreased efficiency, safety concerns, and costly repairs if not addressed promptly.
In this detailed guide, we will explore common drive and steering issues in the CAT 268B, the possible causes behind these issues, and the necessary steps to diagnose and resolve them. Whether you are a seasoned operator or a mechanic, understanding these systems will help you maintain the optimal performance of your skid steer loader.
Understanding the Drive and Steering System in the CAT 268B
The drive and steering systems of the CAT 268B are integral to its operation. These systems work together to control the movement and direction of the loader, enabling it to perform a variety of tasks efficiently. Here’s a breakdown of how these systems function:

• Drive System: The drive system in the CAT 268B consists of the engine, hydraulic pumps, drive motors, and transmission. The engine provides the necessary power, while the hydraulic pumps supply fluid to the drive motors. The transmission system then converts this power to the wheels, allowing the machine to move forward or backward.
  
• Steering System: The steering system operates using a combination of hydraulic cylinders and the wheel motors. By adjusting the flow of hydraulic fluid, the machine’s steering is controlled, allowing for precise turning and maneuvering.
  

The performance of both these systems is heavily dependent on the hydraulic fluid, the condition of key components, and the efficiency of the power transmission system.
Common Drive and Steering Problems in the CAT 268B
While the CAT 268B is a robust machine, operators may experience issues related to the drive and steering systems. These issues often manifest as unresponsiveness, sluggish performance, or total loss of drive or steering control.
1. Loss of Steering Power
One of the most common problems with the steering system in the CAT 268B is the loss of steering power. This can result in difficulty turning the skid steer or a complete inability to steer.
Potential Causes:

• Low Hydraulic Fluid: The hydraulic fluid is essential for operating the steering system. If the fluid is low, it can cause the steering to be unresponsive.
  
• Hydraulic Leak: A leak in the steering hydraulic lines or the steering pump can lead to a loss of pressure, causing poor steering performance.
  
• Faulty Steering Pump: A malfunctioning steering pump may fail to generate sufficient pressure, leading to reduced or no steering capability.
  
• Contaminated Hydraulic Fluid: Dirt or debris in the hydraulic system can obstruct the fluid flow and affect steering performance.
  

What to Do:

• Check Hydraulic Fluid: Inspect the hydraulic fluid levels and ensure they are within the recommended range. If the fluid is low, top it up with the appropriate type of hydraulic oil.
  
• Inspect for Leaks: Examine the hydraulic lines, hoses, and fittings for any signs of leaks. Tighten or replace any faulty components to restore pressure.
  
• Replace the Steering Pump: If the pump is found to be faulty, it may need to be replaced. A professional repair shop can help diagnose and replace the pump if needed.
  
• Flush the Hydraulic System: If contamination is suspected, flush the hydraulic system to remove any debris and replace the fluid.
  

2. Sluggish or Jerky Drive Movement
If the CAT 268B is experiencing sluggish or jerky movement when driving, this could indicate an issue with the drive system, specifically the hydraulic drive motors or the transmission.
Potential Causes:

• Air in the Hydraulic System: Air trapped in the hydraulic system can cause irregular movement, such as jerky or uneven drive motion.
  
• Low Hydraulic Fluid: Similar to the steering system, low hydraulic fluid can reduce the efficiency of the drive motors, leading to sluggish movement.
  
• Worn Drive Motors: Over time, drive motors can wear out, resulting in decreased power and responsiveness.
  
• Clogged Filters: Hydraulic filters that are clogged or dirty can restrict fluid flow, causing poor performance in the drive system.
  

What to Do:

• Bleed the Hydraulic System: If air is suspected in the system, perform a hydraulic bleed to release any trapped air. This can restore smooth movement.
  
• Check Hydraulic Fluid: Ensure the hydraulic fluid is at the proper level. Refill if necessary and check for signs of contamination.
  
• Inspect Drive Motors: If the drive motors appear to be worn or malfunctioning, they may need to be repaired or replaced.
  
• Change Hydraulic Filters: Regularly replace the hydraulic filters to prevent clogging and ensure adequate fluid flow.
  

3. Inability to Move or Drive
In some cases, the CAT 268B may experience a complete loss of movement, where the machine is unable to move in any direction.
Potential Causes:

• Faulty Drive Transmission: A failure in the drive transmission could cause the machine to lose power, preventing it from moving.
  
• Hydraulic Pump Failure: The hydraulic pump that supplies power to the drive motors may have failed or be malfunctioning.
  
• Electrical Issues: In some cases, electrical problems such as a faulty sensor or switch can cause the machine to fail to move, even if the hydraulic system is functional.
  

What to Do:

• Check the Hydraulic Pump: Inspect the hydraulic pump for any signs of failure. If it is not operating correctly, it may need to be replaced.
  
• Inspect the Transmission: A thorough inspection of the drive transmission should be conducted to identify any issues. If damaged, the transmission will need to be repaired or replaced.
  
• Test the Electrical System: Check for any electrical issues, such as blown fuses or faulty wiring, that could be preventing the machine from moving. Address any electrical problems as necessary.
  

4. Uneven Steering or Skidding
If the CAT 268B is experiencing uneven steering or skidding, where one side of the machine steers differently from the other, this can create safety hazards and difficulty in operating the loader.
Potential Causes:

• Uneven Hydraulic Pressure: If the hydraulic pressure is not balanced between the two steering circuits, one side of the machine may turn more easily than the other.
  
• Uneven Tire Wear: Worn-out tires or uneven tire pressure can cause the skid steer to behave unpredictably during turns.
  
• Faulty Steering Cylinder: A malfunctioning steering cylinder on one side of the machine can cause uneven steering.
  

What to Do:

• Check Tire Pressure and Condition: Inspect the tires for uneven wear or damage and check that they are properly inflated. Replace any tires that are worn out.
  
• Balance Hydraulic Pressure: Ensure the hydraulic system is balanced, and check for any issues with the steering circuit. Consult a professional if the issue persists.
  
• Inspect Steering Cylinders: Check the steering cylinders for leaks or damage. Replace any faulty components to restore proper steering functionality.
  

Preventive Maintenance Tips for the CAT 268B Drive and Steering System
To avoid costly repairs and downtime, regular maintenance of the CAT 268B’s drive and steering systems is essential. Here are some key preventive maintenance tips:

• Regular Fluid Checks: Always check the hydraulic fluid levels and condition before and after each use. Ensure the fluid is clean and free of contaminants.
  
• Inspect Hydraulic Lines and Fittings: Periodically inspect the hydraulic hoses, lines, and fittings for any signs of wear or leaks.
  
• Clean Hydraulic Filters: Change or clean the hydraulic filters according to the manufacturer’s recommendations to ensure proper fluid flow.
  
• Monitor Tire Condition: Check the condition and pressure of the tires regularly to prevent uneven wear and improve steering performance.
  
• Check the Steering and Drive System: Inspect the steering pump, drive motors, and transmission regularly for wear or damage.
  

Conclusion
Addressing drive and steering problems in the CAT 268B is essential for keeping the skid steer loader running at peak performance. Whether it’s loss of steering power, sluggish drive movement, or total loss of mobility, understanding the potential causes and solutions can save time and money on repairs. Regular maintenance and timely troubleshooting can help keep the drive and steering systems functioning smoothly, ensuring that your CAT 268B continues to perform effectively on the job site for years to come.