1. Safety First:
- Before starting any work, ensure the tractor is parked on level ground, the engine is turned off, and the parking brake is engaged.
2. Disconnect the Battery:
- Disconnect the negative terminal of the battery to prevent accidental starting.
3. Drain Transmission Fluid:
- Locate the transmission fluid drain plug and place a suitable container underneath to collect the old fluid.
- Remove the drain plug and allow all the old fluid to drain out completely.
4. Remove Transmission Cover:
- Locate and remove the transmission cover to access the transmission components.
5. Remove Hydraulic Lines:
- Disconnect the hydraulic lines connected to the transmission by loosening the fittings. Be cautious, as there might be residual hydraulic pressure.
6. Remove Transmission Bolts:
- Locate the bolts holding the transmission in place and loosen them using the appropriate tools.
7. Detach Transmission:
- Carefully detach the transmission from the tractor frame. This might require support from a jack or another person to prevent the transmission from falling.
8. Remove Transmission Assembly:
- Once detached, carefully remove the transmission assembly from the tractor.
9. Inspect and Clean:
- While the transmission is out, inspect the surrounding area for any damage or debris. Clean the area if necessary.
10. Install New Gaskets and Seals:
- Replace any worn gaskets, seals, or O-rings to prevent leaks. Make sure they are compatible with the new transmission.
11. Mount New Transmission:
- Carefully align the new transmission with the tractor frame and secure it with the bolts you removed earlier. Tighten the bolts to the specified torque.
12. Reconnect Hydraulic Lines:
- Reattach the hydraulic lines you disconnected earlier, ensuring they are securely fastened.
13. Refill Transmission Fluid:
- Refer to your 111H tractor's manual to determine the recommended transmission fluid type and quantity. Fill the transmission with the appropriate amount of new fluid.
14. Test System:
- Start the tractor and allow the engine to idle. Check for any leaks from the transmission or hydraulic lines.
- Engage the transmission and test the forward, reverse, and neutral functions. Make sure the tractor moves smoothly in all directions.
15. Reconnect Battery:
- Reconnect the negative battery terminal to restore power to the tractor.
Remember, replacing a hydrostatic transmission is a complex task that can be potentially dangerous if not done properly. It is highly recommended to consult your tractor's manual and seek assistance from a qualified technician or a local John Deere dealership if you are not experienced with this type of repair.