John Deere — Disassembling Gear Drive Unit Series PM9000C Models
Repair & overhaul
From a John Deere service manual — check it applies to your exact model before use.
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Before you start
- Special attention should be exercised when working with retaining rings. Always wear safety goggles when working with spring or tension loaded fasteners or devices.
- Do not wash the bearing.
Procedure
- Remove the Drain Plug from the bottom of the Gearcase and drain the waste oil.
- Remove the four Gear Case Cap Screws with a 9/16" socket wrench.
- Remove Mounting Flange Adapter from Gear Housing.
- Remove Retaining Ring from the Mounting Flange Adapter with screwdriver.
- Place Mounting Flange Adapter in an arbor press with the shaft end up; press out the Shaft and Bearing Assembly.
- Remove the Bearing Seal, Crescent Retaining Rings, and press the Shaft out of the Bearing.
- Examine teeth of Shaft Pinion Gear or Sun Gear and sealing area for wear or damage.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- On 1000 rpm models, Sun Gear must first be removed with wheel puller.
- On 1000 rpm Models have two Crescent Retaining Rings.
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.