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Home›Repair guides›John Deere›Reassembly of Remaining Hydraulic Motor Parts

John Deere — Reassembly of Remaining Hydraulic Motor Parts

Repair & overhaul

From a John Deere service manual — check it applies to your exact model before use.

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Before you start

  • The Woodruff Key can slide up behind the Inner Gear of the Gerotor when the Gear is installed. Make sure the Key is visible in the slot after the Gear is in place.

Procedure

  1. Place Motor Body in a vise with large end of Shaft facing up.
  2. Install the O-ring in the Body.
  3. Install the Roll Pin on the Shaft and place the Inner Gear of the Gerotor onto the Shaft, lining up the slot with the Key.
  4. Install the outer portion of the Gerotor, centered within the o-ring groove on the Body.
  5. Install the Gerotor Housing, making sure the Pins line up with their respective holes in the Body.
  6. Lightly lubricate between the Inner and Outer Gerotor and the Outer Gerotor and Gerotor Housing with hydraulic oil or mineral oil.
  7. Install O-ring on the Motor End Plate and place End Plate on Gerotor Housing.
  8. Install four Socket Head Cap Screws and tighten in a crisscross pattern to approximately 15 foot pounds [2.07 Nm].
  9. Install the Bypass Adjusting Screw for closed center or open center systems as applicable.
  10. Replace O-rings in both Port Adapters and install Pressure Port Adapter then Tank Port Adapter.
  11. Turn Shaft by hand to check for binding; install Slinger Ring over Motor Shaft.
  12. Install Motor into Pump Mounting Flange and insert four Hex Head Bolts and tighten securely.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Tighten the Socket Head Cap Screws in a crisscross pattern to approximately 15 foot pounds [2.07 Nm] of torque.
  • For open center systems, turn the Bypass Adjusting Screw in until it bottoms out; then turn back out 1-1/2 full turns.

Source: John Deere service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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