About the Massey Ferguson MF135

Massey Ferguson developed a wide range of agricultural vehicles and have a large share in the market across the world especially in Europe. The next big selling model was the MF135, widely popular because of its reliability and power compared with other tractors at the time. This was the first model in the MF 100 series. The Massey Ferguson 135 is a popular tractor. In fact it is one of the most popular tractors for vintage and classic enthusiasts.

Massey Ferguson MF135 and MF148 Tractor factory workshop and repair manual

### Understanding the Oil Pump on a Massey Ferguson MF135/M148 Tractor

#### Function of the Oil Pump

The oil pump is a crucial component in your tractor's engine. Its primary function is to circulate engine oil under pressure to lubricate moving parts, reduce friction, and ensure that the engine runs smoothly. Think of the oil pump like a heart, circulating blood (oil) throughout the body (engine) to keep everything functioning properly.

#### Components of the Oil Pump System

1. **Oil Pump**: The main component, usually located at the front or side of the engine.
- **Gear or Rotor**: Pumps oil by pushing it through the engine. Gear pumps are common in tractors.
- **Cover**: Protects the internal components and provides a mounting surface.
- **Suction Tube**: Draws oil from the oil pan.
- **Pressure Relief Valve**: Prevents excessive pressure buildup, protecting the system from damage.

2. **Oil Filter**: Removes contaminants from the oil before it circulates.
- **Filter Media**: Traps dirt and debris.
- **Bypass Valve**: Allows oil to flow even if the filter is clogged.

3. **Oil Pan**: Holds the engine oil when the engine is not running.
- **Drain Plug**: Allows for oil changes.
- **Sump**: The lowest part where oil collects.

4. **Oil Galleries**: Channels within the engine that direct oil to various components (bearings, camshaft, etc.).

5. **Oil Pressure Gauge**: Indicates the pressure of the oil in the system.

#### Theory Behind Repairing the Oil Pump

Over time, the oil pump can wear out, leading to decreased oil flow and pressure. Insufficient oil flow can cause excessive wear on engine components, overheating, and potentially catastrophic engine failure. Regular checks and maintenance can help prevent these issues.

#### Common Issues with Oil Pumps

1. **Worn Gears**: Can lead to decreased oil pressure.
2. **Clogged Oil Filter**: Restricts oil flow.
3. **Failed Pressure Relief Valve**: Can cause excessive pressure or insufficient oil flow.
4. **Oil Leaks**: Can come from faulty gaskets or seals, leading to low oil levels.

#### Steps to Replace the Oil Pump

1. **Preparation**:
- Gather tools: wrenches, sockets, screwdriver, oil filter wrench, new oil pump, new oil filter, and engine oil.
- Safety gear: gloves and safety glasses.

2. **Drain Engine Oil**:
- Locate the drain plug on the oil pan.
- Remove the plug and allow the old oil to drain completely into a container.

3. **Remove Oil Filter**:
- Use an oil filter wrench to unscrew the old filter. Expect some oil to spill out.

4. **Access the Oil Pump**:
- Remove any components obstructing access to the oil pump (e.g., belts, brackets).
- Unbolt the oil pump cover and gently lift it out.

5. **Inspect and Replace the Pump**:
- Examine the old pump for wear. If the gears are worn, replace the pump.
- Clean the mounting surface on the engine block.

6. **Install New Oil Pump**:
- Position the new pump and secure it with bolts.
- Ensure the suction tube is correctly aligned.

7. **Reinstall Oil Filter**:
- Apply a little new oil to the rubber gasket of the new filter.
- Screw the filter into place.

8. **Reassemble Components**:
- Reattach any parts removed to access the oil pump.

9. **Fill with New Oil**:
- Pour new oil into the oil fill cap. Check the owner's manual for the correct amount and type.

10. **Check Oil Pressure**:
- Start the tractor and let it run for a few minutes. Check the oil pressure gauge to ensure it's within the specified range.

11. **Check for Leaks**:
- Inspect the oil pump area for leaks.

#### Conclusion

Replacing the oil pump on a Massey Ferguson MF135 or M148 tractor is a straightforward but crucial task to ensure the longevity of the engine. Regular maintenance, including oil changes and checking oil pressure, can prevent many of the common issues that lead to oil pump failure. Understanding how the oil pump operates and what can go wrong will help you maintain your tractor effectively.
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### Crankshaft Position Sensor Replacement on Massey Ferguson MF135 M148 Tractor

#### Tools Needed:
1. **Socket Set** (Metric and SAE)
2. **Wrench Set**
3. **Screwdriver Set**
4. **Torque Wrench**
5. **Pliers**
6. **Multimeter** (for electrical testing)
7. **Shop Rag** or **Paper Towels**
8. **Safety Glasses**
9. **Gloves**

#### Safety Precautions:
1. **Disconnect the Battery**: Always disconnect the negative battery terminal to prevent electrical shock or short circuits.
2. **Work on a Level Surface**: Ensure the tractor is on a stable, level surface to prevent it from rolling.
3. **Use Personal Protective Equipment (PPE)**: Wear gloves and safety glasses to protect against dirt and debris.
4. **Allow Engine to Cool**: Ensure the engine is cool before starting work to avoid burns.

#### Step-by-Step Procedure:

1. **Locate the Crankshaft Position Sensor**:
- The sensor is typically located near the crankshaft on the engine block. Refer to the service manual for the exact location.

2. **Remove Obstructions**:
- Depending on the tractor's configuration, you may need to remove components such as the air intake or covers to access the sensor.

3. **Disconnect the Electrical Connector**:
- Carefully unplug the electrical connector from the crankshaft position sensor. Use pliers if necessary to avoid damaging the connector.

4. **Remove the Sensor**:
- Using the appropriate socket/wrench, unscrew the bolts or screws holding the sensor in place.
- Gently pull the sensor out of its housing. Be cautious not to damage the surrounding components.

5. **Inspect the Sensor and Connector**:
- Check for any signs of wear, corrosion, or damage on the old sensor and the connector. Clean any debris in the area.

6. **Install the New Sensor**:
- Place the new crankshaft position sensor into the housing. Ensure it fits snugly.
- Tighten the bolts/screws to the manufacturer's specified torque settings using a torque wrench.

7. **Reconnect the Electrical Connector**:
- Plug the electrical connector back into the new sensor. Ensure it clicks into place securely.

8. **Reassemble Any Removed Components**:
- Reinstall any components that were removed to access the sensor, ensuring all bolts/screws are properly tightened.

9. **Reconnect the Battery**:
- Reconnect the negative terminal of the battery.

10. **Test the Sensor**:
- Start the engine to ensure it runs smoothly. Use a multimeter to check the signal output from the sensor if necessary.

#### Common Pitfalls to Avoid:
- **Forcing the Sensor**: Do not force the sensor into place; it should slide in easily. Forcing can cause damage.
- **Neglecting Torque Specs**: Always use a torque wrench to avoid over-tightening, which can damage the sensor or housing.
- **Ignoring Electrical Issues**: If the new sensor does not resolve the issue, check the wiring and connectors for damage or corrosion.
- **Not Cleaning the Area**: Ensure the area around the sensor is clean before installation to prevent debris from entering the engine.

#### Replacement Parts:
- Always use OEM or high-quality aftermarket parts that meet specifications for the MF135 M148. Ensure the part number matches the original sensor to avoid fitment issues.

This procedure will help you successfully replace the crankshaft position sensor on a Massey Ferguson MF135 M148 tractor with safety and efficiency.
rteeqp73