John Deere — Gear Drive Unit Reassembly
Repair & overhaul
From a John Deere service manual — check it applies to your exact model before use.
Browse John Deere generators & specs →
Before you start
- Be careful not to damage the Teeth of the Gears.
- The weep holes in the Mounting Flange Adapter must face down - towards feet. Do not force together.
- Do not overfill. Do not use the Side Plugs on the Gear Case for a fill level indicator.
Procedure
- Place the Gear Case in the press face up; press the Main Bearing in and insert a large Retaining Ring.
- Position the Driver Hub in the Main Bearing and press in, bottoming on the Main Bearing.
- Install the Main Bearing Retaining Ring with pliers.
- Slide a new Oil Seal over the Driver Hub and press into the Gearcase until flush.
- Position the Large Fixed Gear into the Gear Case, aligning lugs into slots, and insert oiled Cushion Bumpers.
- Install the Driver Gears with thrust washers and races; apply red thread locking compound to the bolts and tighten.
- Press the Pump Shaft into the Bearing and install Crescent Retaining Rings.
- Lightly grease and install the large O-ring into the groove of the Mounting Flange Adapter.
- Align holes and secure with Gear Case Cap Screws using a 9/16" socket wrench.
- Replace the Bottom Drain Plug, remove the Top Fill Plug and fill the Gearcase with approximately 6 oz. of Phillube SAE 80W90 Gear Oil.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Fill the Gearcase with approximately 6 oz. of Phillube SAE 80W90 Gear Oil.
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.