PLUG 3900320 - Caterpillar

Illustration 1 g01451295
(1) Oil fill/drain plug
(2) Oil check plug
Position one final drive so that the oil fill/drain plug (1) is at the bottom. Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on containing fluid spillage.
Use an 8 mm (5/16 inch) allen wrench. Remove the oil plugs (1) and (2). Allow the oil to drain into a suitable container.
Check the drained oil for metal chips or for particles. If there are any chips or particles, consult your Caterpillar dealer. Note: Dispose of drained fluids according to local regulations.
Clean the plugs and inspect the plugs. Replace a worn plug or a damaged plug.
Position the final drive so that the oil fill/drain plug (1) is at the top.
Add oil through the opening of the oil fill/drain plug (1) that is now at the top.
Fill the final drive to the bottom of the opening for the oil check plug (2). Refer to Operation and Maintenance Manual, "Lubricant Viscosities" and Operation and Maintenance Manual, "Capacities (Refill)".
Install the two oil plugs. Tighten the oil plugs to a torque of 27 1 N m (20 0.7 lb ft).
Perform Step 1 to Step 8 on the other final drive.
Completely remove any oil that has spilled.
Start the engine and allow the final drives to operate through several cycles.
Stop the engine.
Check the oil level.
Maintain the oil level to the bottom of the opening for the fill/drain plug (2).