### Tools Needed:
1. **Wrenches**: 10mm, 12mm, and adjustable wrenches.
2. **Socket Set**: Metric and imperial sizes.
3. **Screwdrivers**: Flathead and Phillips.
4. **Pliers**: Needle-nose and regular.
5. **Brake Line Wrench**: To prevent rounding off the brake line nuts.
6. **Fluid Catch Pan**: To catch any leaking hydraulic fluid.
7. **New Clutch Master Cylinder**: Ensure it's compatible with MF35.
8. **New Hydraulic Fluid**: As specified in the owner's manual.
9. **Clean Rags**: For cleanup and wiping surfaces.
10. **Safety Glasses and Gloves**: For personal protection.

### Safety Precautions:
- **Disconnect Battery**: Prevent electrical shorts or accidental starts.
- **Work in a Ventilated Area**: Avoid inhaling fumes from the hydraulic fluid.
- **Wear Gloves and Safety Glasses**: Protect your hands and eyes from hydraulic fluid and debris.
- **Ensure Tractor is Stable**: Use wheel chocks and ensure the tractor is on a flat surface.

### Step-by-Step Replacement Process:

1. **Prepare the Work Area**:
- Park the tractor on a level surface.
- Place wheel chocks behind the rear wheels.
- Disconnect the negative battery terminal.

2. **Drain Hydraulic Fluid**:
- Position the fluid catch pan under the clutch master cylinder.
- Open the reservoir cap and drain any fluid into the pan.

3. **Locate the Clutch Master Cylinder**:
- The clutch master cylinder is usually located near the clutch pedal.
- Identify the mounting bolts and hydraulic lines connected to it.

4. **Disconnect Hydraulic Lines**:
- Using the brake line wrench, carefully loosen the hydraulic lines connected to the master cylinder.
- Be prepared for some fluid leakage; let it drain into the catch pan.

5. **Remove Bolts**:
- Using the appropriate socket or wrench, remove the mounting bolts securing the master cylinder to the tractor.
- Keep the bolts in a safe place as you will need them for the new cylinder.

6. **Remove the Old Cylinder**:
- Carefully pull the old master cylinder away from its mounting location.
- Inspect the old cylinder and surrounding area for any damage or corrosion.

7. **Install the New Clutch Master Cylinder**:
- Align the new cylinder into the mounting position.
- Secure it with the previously removed bolts; tighten them to the manufacturer’s specifications.

8. **Reconnect Hydraulic Lines**:
- Attach the hydraulic lines to the new master cylinder using the brake line wrench.
- Ensure they are snug but do not overtighten to avoid damaging the threads.

9. **Refill Hydraulic Fluid**:
- Fill the master cylinder reservoir with the appropriate hydraulic fluid.
- Check the owner’s manual for the correct type and capacity.

10. **Bleed the Clutch System**:
- Locate the bleed screw on the slave cylinder.
- Attach a clear tube to the bleed screw and submerge the other end in a catch container.
- Open the bleed screw and pump the clutch pedal until fluid flows without air bubbles.
- Close the bleed screw and ensure the reservoir is topped off.

11. **Check for Leaks**:
- Inspect all connections for any signs of leaking fluid.
- If leaks are found, tighten connections as necessary.

12. **Reconnect the Battery**:
- Reattach the negative battery terminal.

13. **Test the Clutch**:
- Start the tractor and test the clutch operation.
- Ensure it engages and disengages smoothly without any issues.

### Common Pitfalls to Avoid:
- **Not Bleeding the System Properly**: Failing to remove air from the system can lead to poor clutch performance.
- **Overtightening Connections**: This can damage threads and cause leaks.
- **Using Incorrect Fluid**: Always refer to the manual for the right hydraulic fluid type.
- **Ignoring Safety Precautions**: Ensure all safety measures are in place before starting work.

By following these steps and precautions, you can successfully replace the clutch master cylinder on a Massey Ferguson MF35 tractor.
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