Transmission Removal for the John Deere 710G Backhoe: A Step-by-Step Guide

[MikePhua]

The John Deere 710G backhoe is a powerful and versatile machine used for a wide range of tasks in construction, landscaping, and utility work. With its robust hydraulic system and durable transmission, it is designed to handle demanding environments. However, like any heavy machinery, the transmission may occasionally need to be removed for maintenance or repair.
Removing and replacing the transmission on a John Deere 710G backhoe is a complex task that requires precision, proper tools, and a solid understanding of the machine’s components. In this guide, we will walk you through the process of removing the transmission, troubleshooting common issues, and offering tips on reassembly and reinstallation.
Understanding the Transmission System in the John Deere 710G
Before diving into the removal process, it’s important to understand the role of the transmission in the John Deere 710G backhoe. The transmission is responsible for transferring power from the engine to the wheels and auxiliary components. The backhoe’s transmission system allows the machine to shift between forward and reverse gears, ensuring that it can perform tasks efficiently.
Key components involved in the transmission system include:

• Torque converter: Converts engine power into hydraulic power to drive the machine.
  
• Transmission case: Houses the gears and other mechanical components that control power distribution.
  
• Shifting mechanism: Controls the gear selection, allowing for forward, reverse, and neutral positions.
  
• Hydraulic pump: Provides fluid pressure needed for the hydraulic transmission system.
  

Understanding these components is essential before attempting to remove or replace the transmission, as it allows for proper identification of potential issues during the process.
Signs You Might Need to Remove the Transmission
There are several indicators that the transmission in your John Deere 710G backhoe may need to be removed or serviced:

• Slipping Gears: If the transmission is slipping out of gear or is difficult to shift, this can indicate internal damage or wear.
  
• No Movement: A complete failure to move or engage in forward/reverse gears could be a sign of a major transmission problem.
  
• Unusual Noises: Grinding or whining noises from the transmission can signal problems with the gears or torque converter.
  
• Leaking Fluid: Excessive hydraulic fluid leaking from the transmission area is often a sign of seal or gasket failure.
  

If you notice any of these signs, it is important to act quickly and assess whether the transmission needs to be removed for further inspection and repair.
Step-by-Step Guide to Removing the Transmission
Removing the transmission from the John Deere 710G backhoe requires careful attention to detail and proper handling of the heavy components. Follow these steps to successfully remove the transmission:
1. Prepare the Backhoe for Work
Before starting any disassembly, ensure the backhoe is on a stable, level surface. Engage the parking brake, and remove the key from the ignition to ensure safety during the process.
Next, raise the backhoe’s boom and secure it with blocks or supports to keep it elevated. This will provide you with ample space to work around the transmission area.
2. Disconnect the Battery
For safety reasons, disconnect the machine’s battery. This will prevent any electrical accidents when working around the transmission area and prevent inadvertent electrical system engagement during disassembly.
3. Drain the Transmission Fluid
To avoid hydraulic fluid spillage, drain the transmission fluid by removing the drain plug at the bottom of the transmission case. Collect the fluid in a clean container to dispose of it properly. Always check the fluid for any signs of contamination, which may provide insight into the issue at hand.
4. Remove the Rear Axle and Differential
In order to gain access to the transmission, you may need to remove the rear axle and differential. Begin by loosening and removing the bolts securing the rear axle to the chassis. You’ll also need to disconnect any hydraulic or electrical connections that run to the rear axle.
Once the rear axle is removed, support the differential and carefully remove it from the machine.
5. Disconnect Hydraulic and Electrical Connections
The transmission on the John Deere 710G is connected to various hydraulic and electrical systems. Disconnect all hydraulic lines running to the transmission, making sure to plug or cap the open connections to prevent contamination.
Additionally, disconnect any electrical wiring that connects to the transmission, including sensors and solenoids. Make sure to label these wires to ensure proper reinstallation later.
6. Unbolt the Transmission Mounting Bolts
Next, locate the transmission mounting bolts. These bolts secure the transmission to the frame of the backhoe. Use a large wrench or socket to remove these bolts, taking care to support the transmission while you work. Transmission bolts are often quite large and may require a breaker bar to loosen.
7. Remove the Transmission
With the mounting bolts removed, the transmission should now be free to be pulled out. It’s important to use a lifting device, such as a hoist or crane, to safely remove the transmission from the machine. Due to the heavy weight of the transmission, it’s crucial to have a second person or team to help with the lifting and guiding of the transmission during this step.
Carefully lower the transmission to the ground or onto a secure surface for further inspection or replacement.
Inspecting and Replacing the Transmission
Once the transmission is removed, it’s time to inspect it for any damage or signs of wear. Common areas to check include:

• Gears and shift mechanism: Look for signs of wear, damage, or misalignment in the gears and shift rods.
  
• Torque converter: Inspect the torque converter for leaks, cracks, or other signs of failure.
  
• Seals and gaskets: Check all seals and gaskets for damage that may cause fluid leaks.
  

If the transmission is significantly damaged or worn out, it may be more cost-effective to replace it with a new or refurbished unit. If the damage is minimal, certain components like seals, gaskets, and bearings can be replaced individually.
Reinstalling the Transmission
Reinstalling the transmission in the John Deere 710G backhoe follows the reverse process of removal. Here’s a quick rundown of the reinstallation steps:

• Position the Transmission: Use a hoist to carefully lift the new or repaired transmission into position.
  
• Bolt the Transmission: Secure the transmission with the mounting bolts, ensuring everything is tight and properly aligned.
  
• Reconnect Hydraulic Lines and Wiring: Reconnect all hydraulic lines and electrical connections, making sure to torque fittings and check for leaks.
  
• Reinstall the Differential and Rear Axle: If you removed the rear axle and differential, reinstall them by following the reverse steps from removal.
  
• Refill the Transmission Fluid: Refill the transmission with the appropriate hydraulic fluid, making sure it reaches the proper level as per the manufacturer’s specifications.
  

Testing the System
Once everything is reassembled, start the backhoe and test the transmission by cycling through the gears. Check for smooth shifting, no unusual noises, and proper hydraulic fluid levels. Take the machine for a short test drive to ensure that the transmission operates efficiently and without any issues.
Conclusion: Keep Your John Deere 710G in Top Condition
Removing and replacing the transmission on the John Deere 710G backhoe is a detailed process that requires a solid understanding of the machine’s components and a methodical approach. Whether you are repairing a damaged transmission or replacing it entirely, following these steps will ensure the job is done safely and efficiently. Regular maintenance and timely repairs can extend the lifespan of your backhoe and keep it running smoothly, reducing costly downtime on the job.