The Massey Ferguson 135 is a workhorse, a true icon of agricultural engineering. Its simplicity and reliability have made it a favorite for decades. However, even the most dependable machines can experience issues, and the power steering system on the MF 135 is no exception. Understanding common problems and their solutions can save you time, money, and frustration, keeping your tractor running smoothly for years to come.
Understanding the MF 135 Power Steering System: A Quick Overview
Before diving into specific problems, it's crucial to understand the basics of the MF 135's power steering system. It's a relatively simple, hydraulically assisted system. Key components include:
- Hydraulic Pump: Driven by the engine, this pump provides the hydraulic pressure necessary for the power steering.
- Reservoir: Holds the hydraulic fluid.
- Control Valve: Directs the flow of hydraulic fluid to the steering cylinder based on the driver's steering input.
- Steering Cylinder: A hydraulic cylinder that assists in turning the front wheels.
- Hydraulic Lines: Connect all the components, carrying the hydraulic fluid.
A failure in any of these components can lead to power steering problems.
My Steering is Heavy! Common MF 135 Power Steering Issues
Let's explore some of the most common complaints and their potential causes:
1. Low Hydraulic Fluid: This is the simplest and often overlooked cause of heavy steering.
- The Problem: If the hydraulic fluid level is low, the pump can't draw enough fluid to create the necessary pressure.
- The Solution: Check the reservoir and top it off with the correct type of hydraulic fluid (usually a universal tractor hydraulic fluid). Always check for leaks that may be causing the low fluid level. Common leak points include the hydraulic lines, cylinder seals, and pump seals.
2. Worn Hydraulic Pump: The pump is the heart of the system.
- The Problem: Over time, the pump can wear out, reducing its ability to generate adequate pressure. Symptoms include heavy steering, especially at low engine speeds, and possibly a whining or groaning noise from the pump.
- The Solution: Test the pump's output pressure using a hydraulic pressure gauge. If the pressure is below the manufacturer's specifications (consult your MF 135 service manual), the pump likely needs to be rebuilt or replaced. Consider a new pump if rebuilding isn't cost-effective.
3. Control Valve Issues: The control valve directs the hydraulic fluid.
- The Problem: The control valve can become worn or clogged, preventing it from directing fluid properly. This can lead to heavy steering, erratic steering, or even steering that works in one direction but not the other.
- The Solution: Inspect the control valve for external damage. Internal problems usually require disassembly and cleaning. A worn or damaged control valve may need to be replaced. This is often a job best left to a qualified mechanic.
4. Steering Cylinder Problems: The cylinder provides the actual assistance.
- The Problem: Leaks in the cylinder seals can reduce its effectiveness. A bent or damaged cylinder rod can also cause problems.
- The Solution: Inspect the cylinder for leaks. If leaks are present, the seals will need to be replaced. A bent or damaged rod will require cylinder replacement or rod straightening (if possible). Replacing the entire cylinder is often the easier and more reliable option.
5. Hydraulic Line Problems: The lines carry the fluid.
- The Problem: Kinked, damaged, or leaking hydraulic lines can restrict fluid flow and reduce power steering performance.
- The Solution: Inspect all hydraulic lines for damage. Replace any lines that are kinked, cracked, or leaking. Ensure that replacement lines are rated for the appropriate pressure.
6. Air in the System: Air can compress, reducing hydraulic pressure.
- The Problem: Air in the hydraulic system can cause spongy or erratic steering.
- The Solution: Bleed the air from the system. This usually involves loosening a bleed screw on the steering cylinder while operating the steering wheel. Consult your MF 135 service manual for the specific bleeding procedure.
7. Incorrect Hydraulic Fluid: Using the wrong type of fluid can damage the system.
- The Problem: Some hydraulic fluids are not compatible with the seals and other components in the MF 135 power steering system.
- The Solution: Use only the hydraulic fluid recommended in your MF 135 service manual. Universal tractor hydraulic fluid that meets the manufacturer's specifications is usually a safe bet.
Troubleshooting Tips: A Step-by-Step Approach
Here's a systematic approach to diagnosing MF 135 power steering problems:
- Check the Fluid Level: Start with the simplest check - ensure the hydraulic fluid reservoir is full.
- Inspect for Leaks: Look for any signs of leaks around the pump, cylinder, lines, and control valve.
- Listen for Noises: Pay attention to any unusual noises coming from the pump or steering system. Whining, groaning, or squealing can indicate a problem.
- Test the Pump Pressure: Use a hydraulic pressure gauge to verify that the pump is producing adequate pressure.
- Check the Steering Linkage: Ensure that all steering linkage components are properly connected and in good condition. Worn or loose linkage can contribute to steering problems.
- Bleed the System: If you suspect air in the system, bleed it according to the manufacturer's instructions.
Preventative Maintenance: Keeping Your MF 135 Steering Smooth
Regular maintenance can significantly reduce the likelihood of power steering problems. Here are some tips:
- Check the Hydraulic Fluid Level Regularly: Make it a habit to check the fluid level before each use.
- Change the Hydraulic Fluid and Filter: Follow the manufacturer's recommended service intervals for changing the hydraulic fluid and filter. Contaminated fluid can damage the pump and other components.
- Inspect Hydraulic Lines and Fittings: Periodically inspect the hydraulic lines and fittings for wear and damage. Replace any damaged components promptly.
- Lubricate Steering Linkage: Keep the steering linkage lubricated to prevent wear and binding.
- Address Leaks Immediately: Don't ignore leaks. Even small leaks can eventually lead to significant problems.
When to Call a Professional
While many MF 135 power steering problems can be diagnosed and repaired by a mechanically inclined owner, some repairs are best left to a qualified mechanic. Consider seeking professional help if:
- You are not comfortable working on hydraulic systems.
- You lack the necessary tools or equipment.
- You are unable to diagnose the problem.
- The repair involves complex procedures, such as rebuilding the pump or control valve.
Remember, safety is paramount. Always disconnect the battery before working on the electrical system and relieve any hydraulic pressure before disconnecting hydraulic lines.
Upgrading Your MF 135 Power Steering
If you're facing persistent problems with your MF 135 power steering, or simply want to improve its performance, consider upgrading to a more modern system. Several aftermarket kits are available that offer improved steering feel and reliability.
- Full Hydraulic Steering Conversion: These kits replace the original power steering system with a full hydraulic system, offering smoother and more responsive steering.
- Improved Power Steering Pumps: Upgrading to a higher-capacity power steering pump can improve steering performance, especially when using a front-end loader or other heavy implements.
Research different options carefully and choose a kit that is compatible with your MF 135 model and meets your specific needs.
Frequently Asked Questions
- Why is my power steering only working intermittently? This could be due to air in the system, a low fluid level, or a failing pump. Check the fluid level and bleed the system first.
- What type of hydraulic fluid should I use? Consult your MF 135 service manual. Universal tractor hydraulic fluid that meets the manufacturer's specifications is usually suitable.
- How often should I change the hydraulic fluid? Follow the manufacturer's recommended service intervals, typically every 500-1000 hours.
- Can I convert my manual steering MF 135 to power steering? Yes, aftermarket power steering kits are available for manual steering MF 135 tractors.
- What are the signs of a failing power steering pump? Common signs include heavy steering, especially at low engine speeds, a whining or groaning noise from the pump, and low hydraulic pressure.
Conclusion
Addressing power steering problems on your Massey Ferguson 135 can seem daunting, but by understanding the system and following a systematic approach to troubleshooting, you can often diagnose and resolve the issue yourself. Regular maintenance and prompt attention to any problems will help keep your MF 135 steering smoothly for years to come. Don't hesitate to consult a professional if you're unsure about any aspect of the repair process.