John Deere — Disassembly and Repair of the Hydraulic Motor
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 work area and motor should be as clean as possible to prevent contamination of parts.
- Special attention should be exercised when working with retaining rings.
Procedure
- Place Hydraulic Motor in vise.
- Remove Tank Port Adapter and Pressure Port Adapter with large crescent wrench or 1-1/16" box end wrench.
- Remove the Bypass Adjusting Screw (Screw, Nut, Washer and Thread-Seal Gasket).
- Remove the Socket Head Cap Screws from the Motor End Plate using a 1/4" allen wrench.
- Carefully pry apart the End Plate and Gerotor Housing; remove both parts of the Gerotor.
- Remove the O-ring from the Motor End Plate and Body.
- Inspect Motor End Plate, Body and Gerotor Housing for wear and/or gouging and replace worn parts.
- Clean all parts in a solvent bath.
Tools required
- vise Amazon
- large crescent wrench or 1-1/16" box end wrench Amazon
- 9/16" box end wrench Amazon
- small screwdriver Amazon
- 1/4" allen wrench Amazon
- knife blade Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- If gouging has occurred in both the Motor End Plate and Body, the Motor is not repairable.
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.