Troubleshooting Oil Leaks Between Tandem Drive Pumps on Gehl Skid Steers

[MikePhua]

Gehl skid steers are renowned for their performance and reliability, but like all heavy equipment, they can experience issues over time. One common issue faced by owners is oil leakage between the tandem drive pumps. This problem can cause reduced hydraulic efficiency, potentially leading to more severe mechanical problems if not addressed in a timely manner. In this article, we will discuss the causes of oil leaks between tandem drive pumps on Gehl skid steers and provide solutions to fix them.
Understanding Tandem Drive Pumps
Tandem drive pumps are essential components in skid steer loaders like the Gehl models. They function by supplying hydraulic power to various parts of the machine, such as the lift arms, auxiliary hydraulics, and tracks. These pumps are typically driven by the engine and work in tandem to provide smooth and efficient operation.
However, like all hydraulic components, these pumps are subject to wear and tear. Over time, seals and gaskets can degrade, leading to oil leaks. Identifying the source of the leak and understanding its cause is crucial to addressing the issue effectively.
Common Causes of Oil Leaks Between Tandem Drive Pumps

1. Worn Seals and Gaskets
   

The most common cause of oil leaks between tandem drive pumps is worn or damaged seals and gaskets. These components are designed to keep oil contained within the pump, but constant pressure and heat can cause them to deteriorate over time.
Solution:

• Inspect the seals and gaskets between the tandem drive pumps.
  
• If any seals appear cracked, brittle, or damaged, they should be replaced with new ones.
  
• Always use OEM (original equipment manufacturer) seals and gaskets to ensure proper fit and performance.
  

1. Improper Installation or Tightening of Components
   

Another potential cause of leaks is improper installation or tightening of the pump components. If the pump housing is not properly sealed, or if bolts are overtightened or left too loose, oil can escape from the seams.
Solution:

• Ensure that the tandem drive pumps are correctly installed according to the manufacturer’s specifications.
  
• Check all bolts for proper tightness and torque settings. Refer to the maintenance manual for correct torque specifications.
  
• Re-tighten or replace any damaged bolts and seals to prevent leaks.
  

1. Hydraulic Pressure Issues
   

Excessive hydraulic pressure can sometimes cause seals to fail prematurely. If the system is pressurized too high or if there is a blockage in the hydraulic lines, it can lead to increased stress on the tandem drive pumps, causing oil leaks.
Solution:

• Check the hydraulic system pressure to ensure it is within the recommended range.
  
• Inspect the hydraulic lines for any blockages or restrictions that may be causing excessive pressure.
  
• If necessary, have a professional technician recalibrate or repair the hydraulic system to restore normal pressure levels.
  

1. Contaminated Hydraulic Fluid
   

Dirty or contaminated hydraulic fluid can increase wear on seals and internal components. If the fluid is contaminated with debris or water, it can cause premature failure of the tandem drive pump’s seals, leading to oil leakage.
Solution:

• Change the hydraulic fluid regularly, as recommended by the manufacturer.
  
• Use high-quality, clean fluid that meets the specifications for your Gehl skid steer model.
  
• Install and regularly check hydraulic filters to prevent contamination.
  

Steps to Fix Oil Leaks Between Tandem Drive Pumps

1. Shut Down the Skid Steer and Drain the Hydraulic Fluid
   

Before starting the repair, make sure the machine is turned off and the hydraulic fluid is drained. This will prevent accidents and ensure you can work safely without exposure to pressurized hydraulic oil.

1. Remove the Tandem Drive Pumps
   

Carefully remove the tandem drive pumps from their mounting positions. This may require removing certain components, such as hoses and bolts, to access the pumps.

1. Inspect the Seals and Gaskets
   

Once the pumps are removed, inspect the seals and gaskets between them. Check for any signs of wear or damage. If any seals are defective, replace them with new, high-quality seals.

1. Clean All Parts and Reassemble
   

Clean the parts thoroughly to remove any old oil and debris. This will help prevent contamination from affecting the performance of the new seals and components. Once cleaned, reassemble the tandem drive pumps and ensure they are securely installed.

1. Refill Hydraulic Fluid and Test the System
   

After the pumps are reinstalled, refill the system with fresh hydraulic fluid. Check for leaks by running the machine and observing the seals and gaskets closely. If no leaks are present, the repair is complete.
Preventive Maintenance Tips for Gehl Skid Steers

1. Regularly Check Hydraulic Fluid Levels
   

Maintaining the proper hydraulic fluid level is crucial for the performance and longevity of the system. Low fluid levels can cause air to enter the system, potentially leading to leaks.

1. Perform Routine Seal Inspections
   

Make it a habit to inspect the seals and gaskets around the tandem drive pumps during routine maintenance. Early detection of wear can prevent larger, more costly problems.

1. Use Clean, High-Quality Hydraulic Fluid
   

Always use clean, high-quality hydraulic fluid to ensure smooth operation and to reduce the risk of contamination that could damage seals.

1. Check Hydraulic Pressure Regularly
   

Ensure that the hydraulic pressure is within the recommended specifications for your machine. Too much pressure can cause wear on the pumps and seals, leading to leaks.
Conclusion
Oil leaks between the tandem drive pumps on a Gehl skid steer can be frustrating but are usually preventable with regular maintenance and attention. By checking for worn seals, ensuring proper installation, monitoring hydraulic pressure, and using clean fluid, you can keep your machine in top condition. If the problem persists, consulting with a professional technician may be necessary to address any underlying issues with the hydraulic system.