How to Plumb a Post Driver onto a John Deere 650

[MikePhua]

Introduction
A post driver is a hydraulic-powered attachment used to drive posts into the ground for fencing, sign installation, or other tasks requiring heavy-duty post setting. The John Deere 650 is a utility tractor with the capacity to operate many attachments, including post drivers. However, the process of plumbing the post driver to your tractor’s hydraulic system can be complex and requires an understanding of the tractor’s hydraulic circuits and the post driver's requirements.
Understanding the Hydraulic System of the John Deere 650
The John Deere 650 is equipped with an open-center hydraulic system. This means the hydraulic oil continuously circulates through the pump until it's directed to an actuator, like a cylinder or motor, when you engage a hydraulic function. It’s important to ensure that the hydraulic flow and pressure specifications match what the post driver requires.

1. Hydraulic Flow:
   The John Deere 650 provides a flow rate of about 6.6 gallons per minute (GPM) at full throttle, which should be sufficient for most small to medium post drivers. However, it's always important to check the post driver's requirements to make sure the flow rate aligns with its specifications.
   
2. Hydraulic Pressure:
   The John Deere 650’s hydraulic system operates at a maximum pressure of around 2,000 psi. Some post drivers may require higher pressures, so it’s essential to check compatibility. If the post driver requires higher pressure, you may need a pressure-regulated valve.
   

Choosing the Right Post Driver
When selecting a post driver, ensure it’s designed to work with a tractor that has a hydraulic system similar to the John Deere 650. Pay special attention to:

• Hydraulic Flow Requirements: Choose a post driver that matches or works within the tractor’s hydraulic flow capabilities.
  
• Pressure Requirements: Confirm that the post driver is designed to operate at the pressure that your tractor’s hydraulic system can deliver.
  

Steps to Plumb the Post Driver

1. Hydraulic Connections:
   Most post drivers will require two hydraulic connections: one for the driver’s vertical movement and another for the horizontal swing (if the model has it). Use quick-connect fittings for easy attachment and detachment of the hoses.
   
2. Connecting the Lines:
   The John Deere 650 typically has rear remotes, which are used to connect the post driver’s hydraulic hoses. These remotes control the flow of hydraulic fluid to the attachment. If your tractor does not have rear remotes, you will need to install a rear hydraulic kit to enable the necessary connections.
   
3. Installation of Flow Control Valve:
   Many post drivers have a flow control valve that regulates the speed at which the hydraulic motor operates. The John Deere 650 may not need an external flow control if the post driver includes its own, but if not, you can install a flow control valve on the hydraulic line to avoid excessive speed, which can cause damage to both the tractor and the post driver.
   
4. Check Hydraulic Pressure:
   Using a pressure gauge, verify that the pressure being supplied is within the range that the post driver can handle. If needed, install a pressure relief valve or an adjustable flow control valve to avoid damaging the attachment or the tractor’s hydraulic system.
   
5. Test the System:
   Once everything is connected, run the post driver for a short period to check for proper function. Listen for unusual sounds (which may indicate cavitation or air in the lines) and ensure that the post driver moves smoothly without jerking or stalling.
   

Troubleshooting

• Low Pressure:
  If the post driver seems sluggish or struggles to operate, check for air in the hydraulic lines, a clogged filter, or a malfunctioning pump. Ensure all fittings are tightly sealed to prevent leaks.
  
• Leaks:
  Hydraulic leaks can prevent proper operation. Inspect all hydraulic hoses and connections for leaks. Replace any worn or cracked hoses immediately to maintain system pressure.
  
• Inconsistent Operation:
  If the post driver moves intermittently or inconsistently, check that the flow control valve is set correctly and that the hydraulic oil is clean and at the right level.
  

Conclusion
Plumbing a post driver onto a John Deere 650 tractor is a task that requires careful consideration of hydraulic specifications, proper installation of necessary components, and thorough testing. By ensuring compatibility between your tractor’s hydraulic system and the post driver, and by following proper installation procedures, you can maximize the performance and longevity of both your tractor and your post driver. Regular maintenance and inspection will keep the system running smoothly for years of efficient post-driving operations.