The Massey Ferguson 135, a true icon of the agricultural world, is celebrated for its reliability and versatility. However, like any machine, it's not immune to problems, and one of the most common headaches for MF 135 owners involves the hydraulic lift system. A malfunctioning lift can render implements useless, turning a productive day in the field into a frustrating one. Let's dive into the common hydraulic lift issues on the MF 135 and explore how to diagnose and potentially fix them, keeping your trusty tractor working hard.
My Lift Won't Go Up! Is it a Big Deal?
Probably not a huge deal, but it definitely needs attention. The hydraulic lift system on the MF 135 is responsible for raising and lowering implements like plows, harrows, and mowers. When it fails, you're stuck. The problem could range from something simple like low hydraulic fluid to a more complex issue involving the pump, control valve, or even internal leaks. Let's explore the usual suspects.
First Things First: The Basics - Fluid and Linkages
Before tearing into the engine or hydraulics, check the obvious. It sounds simple, but you'd be surprised how many hydraulic problems are caused by neglecting the fundamentals.
- Hydraulic Fluid Level: This is the number one thing to check. Low fluid means the pump can't create enough pressure to lift anything. Use the dipstick (usually located near the hydraulic pump) to verify the level. Top up with the correct type of hydraulic fluid (check your owner's manual for the specific recommendation - often a Universal Tractor Fluid, or UTF).
- Fluid Condition: Is the fluid clean or milky? Milky fluid indicates water contamination, which can damage the pump and other components. Dirty fluid can clog filters and restrict flow. If the fluid is suspect, drain and replace it.
- Linkage Adjustment: Make sure the linkage connecting the control lever to the hydraulic valve is properly adjusted. If the linkage is loose or bent, the valve might not be opening fully, restricting lift. Look for any obvious damage or wear in the linkage. Try adjusting the turnbuckles if equipped, to ensure full travel of the control valve.
- External Leaks: Inspect all hydraulic lines, fittings, and cylinders for leaks. Even small leaks can reduce the overall hydraulic pressure, impacting lift performance. Tighten any loose fittings and replace damaged hoses or seals.
The Hydraulic Pump: The Heart of the System
If the basics are okay, the hydraulic pump is the next place to investigate. The pump is responsible for creating the hydraulic pressure needed to lift implements.
- Pump Location: The hydraulic pump on the MF 135 is typically located inside the transmission housing, driven by the engine.
- Testing the Pump: A pressure gauge is your best friend here. Connect a gauge to a test port on the hydraulic system (usually located near the pump or control valve). Start the tractor and engage the hydraulics. The gauge should show a pressure reading within the manufacturer's specifications (again, check your owner's manual). Low pressure indicates a problem with the pump.
- Pump Failure: Pumps can fail in several ways. Wear and tear on the internal components (gears, pistons, etc.) can reduce their efficiency. Internal leaks within the pump can also cause a loss of pressure. Contaminated fluid is a common culprit behind premature pump failure.
- Pump Replacement: If the pump is faulty, replacement is often the best option. Rebuilding a hydraulic pump requires specialized tools and knowledge. Ensure you purchase a pump that is compatible with your MF 135 model.
The Control Valve: Directing the Flow
The control valve directs hydraulic fluid to the lift cylinder, allowing you to raise and lower implements. Problems with the control valve can prevent the lift from working correctly.
- Valve Location: The control valve is usually located under the seat, near the hydraulic lift quadrant.
- Sticking Valve: The control valve can sometimes stick due to dirt, rust, or corrosion. This can prevent the valve from opening or closing properly, restricting hydraulic flow.
- Internal Leaks: Internal leaks within the control valve can also reduce hydraulic pressure and affect lift performance.
- Valve Adjustment: Some control valves have adjustment screws that can be used to fine-tune their operation. However, messing with these adjustments without proper knowledge can cause more harm than good. Consult a service manual or experienced mechanic before attempting any adjustments.
- Valve Cleaning/Replacement: If the valve is sticking, try cleaning it with a solvent designed for hydraulic systems. If cleaning doesn't work, or if the valve is severely worn, replacement is necessary.
The Lift Cylinder: Where the Power Meets the Implements
The lift cylinder is what actually raises and lowers the implements. It's a simple device, but it can still cause problems.
- Cylinder Location: The lift cylinder is located inside the rear axle housing.
- External Leaks: Check the cylinder for external leaks. Leaks around the piston rod seal are common.
- Internal Leaks: Internal leaks within the cylinder can also cause problems. If the piston seal is worn, fluid can leak past the piston, reducing the lifting force. This can cause the lift to lower slowly or not lift at all.
- Cylinder Repair/Replacement: Depending on the severity of the problem, the cylinder can be repaired or replaced. Repair typically involves replacing the seals. Replacement is necessary if the cylinder is damaged or severely worn.
Hydraulic Filters: Keeping Things Clean
Hydraulic filters are essential for keeping the hydraulic fluid clean and preventing damage to the pump and other components.
- Filter Location: The hydraulic filter is usually located in the hydraulic system, often near the pump.
- Clogged Filter: A clogged filter restricts hydraulic flow and can reduce lift performance.
- Filter Replacement: Replace the hydraulic filter regularly according to the manufacturer's recommendations. This is a simple and inexpensive way to prevent hydraulic problems.
Other Potential Culprits: A Troubleshooting Checklist
Sometimes, the problem isn't as straightforward as a bad pump or a clogged filter. Here are some other things to consider:
- Draft Control Issues: The MF 135 has a draft control system that automatically adjusts the implement height based on the soil resistance. If the draft control is malfunctioning, it can interfere with the lift operation. Ensure the draft control lever is in the correct position.
- Relief Valve Problems: The hydraulic system has a relief valve that protects it from overpressure. If the relief valve is stuck open, it can bleed off hydraulic pressure, preventing the lift from working.
- Worn Piston Rings: While less common, worn piston rings in the engine can cause a loss of vacuum, which can indirectly affect the hydraulic system on some older models.
- Incorrect Oil Type: Using the wrong type of hydraulic oil can cause problems. Always use the oil recommended in your owner's manual.
- Air in the System: Air in the hydraulic system can cause erratic lift operation. Bleeding the system can remove the air. Consult your service manual for the proper bleeding procedure.
Diagnosing the Problem: A Step-by-Step Approach
Troubleshooting hydraulic problems can seem daunting, but by following a systematic approach, you can narrow down the cause and find a solution.
- Start with the Basics: Check the fluid level, fluid condition, and linkage adjustment.
- Listen for Unusual Noises: A whining or grinding noise from the hydraulic pump can indicate a problem.
- Check for Leaks: Inspect all hydraulic lines, fittings, and cylinders for leaks.
- Test the Pump Pressure: Use a pressure gauge to test the pump output.
- Inspect the Control Valve: Check for sticking or leaks.
- Check the Lift Cylinder: Look for leaks and signs of wear.
- Replace the Hydraulic Filter: If it's been a while, replace the filter.
- Consult a Service Manual: A service manual provides detailed information on the hydraulic system and troubleshooting procedures.
- Seek Professional Help: If you're not comfortable working on the hydraulic system, take the tractor to a qualified mechanic.
Frequently Asked Questions
Why is my MF 135 hydraulic lift jerky? Air in the system or a sticking control valve are common causes. Try bleeding the system and cleaning the control valve.
My lift raises slowly. What's wrong? Low hydraulic fluid, a clogged filter, or a worn pump could be the culprit. Check these components first.
How often should I change the hydraulic fluid? It depends on usage, but generally every 500-1000 hours, or annually if you use it less.
Can I use any hydraulic fluid in my MF 135? No! Always use the type of hydraulic fluid recommended in your owner's manual. Using the wrong fluid can damage the system.
What is the pressure relief valve for? It protects the hydraulic system from excessive pressure, preventing damage to the pump and other components.
Keeping Your MF 135 Lifting for Years to Come
The Massey Ferguson 135 is a workhorse, and a properly functioning hydraulic lift is essential for its continued usefulness. By understanding the common hydraulic lift problems and following a systematic troubleshooting approach, you can keep your MF 135 lifting strong for years to come. Regular maintenance, including fluid and filter changes, is key to preventing problems in the first place.