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Excavator Final Drive Removal and Replacement

Here are some tips to help with excavator final drive removal and correct connection of the hydraulic hoses.

The original machine manufacturers procedures should be followed when known.

How to remove final drive from excavator

  • Remove the track and loosen the sprocket bolts
  • Tip: It is much easier to loosen the sprocket bolts before removing the final drive
  • Remove the track motor cover plate from inside the undercarriage frame
  • Sling the final drive and take the weight: Caution: final drives can be very heavy
  • Mark the hydraulic hoses so you can later identify them
  • Remove the hoses and cap them, plug the ports on the track motor. It is very important to seal all hydraulic hoses and ports to prevent contamination of the hydraulic system.  
  • From inside the track frame remove the bolts securing the final drive to the frame.  
  • Swing out the final drive.

If the final drive is tight in the track frame do not hit the travel motor in an attempt to free it. It will damage the motor. Lever the final drive out from outside of the track frame.

Fitting a new final drive

Fitting a new final drive is the reverse of removal but pay special attention when connecting the pipes as incorrect fitting can cause an immediate failure of the travel motor.

Refer to the Bolt Torque Settings page when tightening bolts

Hydraulic pipe connections

Refer to Travel Port Motor Identification to safely identify the appropriate connections for your machine.

ATTENTION Case drain — Leak-off. All piston type hydraulic motors leak oil from the barrel and piston assembly (sometimes called the rotating group assembly) into the motor casing. This leakage is deliberate and lubricates the piston slippers and swash plate (or thrust plate) as well as the interface between the valve plate (or lens plate) and the cylinder block. The oil that leaks into the motor casing has to find it’s way back to the tank under very little pressure and a leak-off pipe (or drain line) runs from the travel motor to the hydraulic tank for that purpose. If the leak-off pipe is not connected or becomes blocked or pressurised, oil pressure will build up in the motor casing and can, and usually does, cause catastrophic damage to the travel motor and often the final drive gearbox. It is therefore vital to ensure that the leak-off pipe is connected correctly, is not obstructed and has no significant back pressure.