Repairing Final Drive Motor Leaks on the New Holland LX885 Skid Steer

[MikePhua]

The LX885 and Its Hydraulic Drive System
The New Holland LX885 skid steer loader was introduced in the late 1990s as part of the brand’s push into high-performance compact equipment. With a rated operating capacity of around 1,700 pounds and a 60-horsepower diesel engine, the LX885 became a popular choice for contractors, landscapers, and municipalities. Its hydrostatic drive system uses two final drive motors—one for each side—to deliver torque directly to the wheels, enabling precise maneuvering and variable speed control.
These final drive motors are hydraulic units mounted to the frame and connected to planetary gearboxes. They receive pressurized fluid from the pump and return low-pressure fluid to the reservoir. Over time, seals and O-rings within the motor housing can degrade, leading to external leaks or internal bypassing.
Terminology and Component Notes
- Final Drive Motor: A hydraulic motor that powers the wheels or tracks of a skid steer, converting fluid pressure into rotational motion.
- O-Ring: A circular elastomer seal used to prevent fluid leakage between mating surfaces; commonly used in hydraulic systems.
- Case Drain Line: A low-pressure return line that carries leakage oil from the motor housing back to the tank.
- Internal Pressure Spike: A sudden increase in hydraulic pressure within the motor, often caused by blockage or valve malfunction.
- Planetary Gearbox: A gear system that multiplies torque from the motor, allowing high force at low speed.
Identifying the Leak and Planning the Repair
In one instance, an LX885 exhibited a hydraulic leak at a specific location on the final drive motor housing. The operator identified the leak near a sealing surface and planned to replace O-ring number 29, based on the exploded parts diagram. This type of leak is often caused by seal fatigue, improper installation, or elevated internal pressure.
Before replacing the O-ring, it’s important to assess whether the leak is symptomatic of a deeper issue:

• Is the motor experiencing excessive heat or noise?
  
• Has the machine lost drive power or shown signs of sluggish movement?
  
• Is the case drain line flowing more than expected, indicating internal bypass?
  
• Are other hydraulic components showing signs of contamination or wear?
  

If the leak is isolated and the motor still performs normally, replacing the O-ring may be sufficient. However, if the motor must be removed to access the seal, it may be more cost-effective to rebuild or replace the entire unit, especially if labor hours are high.
Repair Strategy and Practical Considerations
When replacing the O-ring:

• Clean the motor housing thoroughly to prevent debris from entering the system
  
• Use OEM or high-quality aftermarket seals rated for hydraulic fluid and temperature
  
• Lubricate the O-ring with hydraulic oil before installation to prevent pinching
  
• Inspect the sealing surface for scratches or corrosion that could compromise the seal
  
• Torque bolts evenly to avoid warping the housing
  

If the motor must be removed:

• Drain hydraulic fluid and cap all lines to prevent contamination
  
• Label hoses and fittings to ensure correct reassembly
  
• Consider replacing other seals and bearings while the motor is disassembled
  
• Test the motor on a bench rig before reinstalling to confirm leak-free operation
  

One technician noted that elevated internal pressure can cause leaks at the weakest sealing point. If the motor is leaking despite a new O-ring, the root cause may be a blocked return line or a malfunctioning relief valve upstream.
New Holland’s Skid Steer Legacy and LX885 Market Impact
New Holland, originally founded in Pennsylvania in 1895, became a major player in agricultural and construction equipment. The LX885 was part of its compact loader lineup during the late 1990s and early 2000s, competing with models from Bobcat, Case, and Gehl.
Sales of the LX885 were strong across North America, with many units still in service today. Its mechanical simplicity and robust frame made it a favorite among owner-operators and small contractors. The hydrostatic drive system, while efficient, requires careful maintenance to avoid costly repairs.
Preventative Maintenance and Long-Term Solutions
To prevent future leaks and extend motor life:

• Change hydraulic fluid and filters at recommended intervals
  
• Monitor case drain flow to detect early signs of internal wear
  
• Use infrared thermometers to check motor temperature during operation
  
• Avoid sudden directional changes that can spike internal pressure
  
• Keep the machine clean to reduce contamination risk during repairs
  

In one fleet, regular fluid sampling helped identify early motor wear before external leaks occurred. By replacing motors proactively, they avoided downtime and reduced repair costs.
Conclusion
A leaking final drive motor on the New Holland LX885 is often a seal issue—but it can also signal deeper hydraulic imbalance. Replacing the O-ring may solve the problem, but only if internal pressure and motor condition are within spec. By combining careful inspection, quality parts, and preventative maintenance, operators can keep their LX885 running smoothly and avoid the costly consequences of overlooked leaks. In compact equipment, small seals protect big investments.