306, 306 CR, and 306.5 Mini Hydraulic Excavators Final Drive Oil - Change Caterpillar


Final Drive Oil - Change
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------ WARNING! ------

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.




Illustration 1g03483619
(1) Oil drain plug
(2) Oil level plug
(3) Oil filler plug

  1. Position one final drive so that oil drain plug (1) is at the bottom.

    Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on containing fluid spillage.

  2. Remove oil drain plug (1), level plug (2), and filler plug (3). Allow the oil to drain into a suitable container.

  3. Clean the plugs and inspect the plugs. Replace a worn plug or a damaged plug.

  4. Apply pipe sealant to oil drain plug (1), level plug (2), and filler plug (3).

  5. Install drain plug (1).

  6. Add oil through the opening of filler plug (3).

    Note: Overfilling the final drive will cause the seals to move out of place in the travel motor. Hydraulic oil or water may then enter the final drive and contaminate the final drive.

  7. Fill the final drive to the bottom of the opening for level plug (2). Refer to Operation and Maintenance Manual, "Lubricant Viscosities" and Operation and Maintenance Manual, "Capacities (Refill)".

  8. Install level plug (2) and filler plug (3).

  9. Perform Step 1 to Step 8 on the other final drive. Do not combine the oil for the final drives in the same container. The oil from the final drives must be kept separate for the check that is performed in Step 15.

  10. Completely remove any oil that has spilled.

  11. Start the engine and allow the final drives to operate through several cycles.

  12. Stop the engine.

  13. Check the oil level.

  14. Maintain the oil level to the bottom of the opening for level plug (2).

  15. Check the drained oil for metal chips or for particles. If there are any chips or particles, consult your AVSpare dealer.

    Note: Dispose of drained fluids according to local regulations.

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