Changing the gearbox oil on a Komatsu D375A-3 bulldozer is essential for maintaining optimal performance and prolonging the life of the equipment. click here for more details on the download manual…..

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Below is a detailed guide outlining the tools and steps required for the oil change process:

### Tools and Equipment Needed:
– **Oil Drain Pan**: A large, suitable container to catch old oil.
– **Wrenches**: Various sizes, including a socket set, to remove drain plugs and fill plugs.
– **Torque Wrench**: To ensure that bolts and plugs are tightened to the manufacturer’s specifications.
– **Oil pump or Funnel**: To facilitate the filling of new oil into the gearbox.
– **New Gearbox Oil**: Ensure it meets the specifications recommended in the operator’s manual (typically API GL-4 or GL-5).
– **Oil Filter**: If applicable, replace the oil filter during the change.
– **Rags or Shop Towels**: For cleaning up spills and wiping hands.
– **Safety Equipment**: Gloves, goggles, and a coveralls to protect against oil and dirt.
– **Jack and Jack Stands**: To elevate the machine safely if required for access.
– **Pliers**: For removing any clamps or hoses that may obstruct access.

### Steps for Gearbox Oil Change:
– **Preparation**:
– Gather all necessary tools and materials.
– Park the Komatsu D375A-3 on a flat, stable surface and engage the parking brake.
– Allow the machine to cool down if it has been in operation to prevent burns.

– **Access the Gearbox**:
– If necessary, elevate the bulldozer using a jack and secure it with jack stands for better access.
– Locate the gearbox oil drain plug, typically found at the lowest point of the gearbox.

– **Drain old Oil**:
– Position the oil drain pan under the drain plug.
– Use the appropriate wrench to loosen and remove the drain plug.
– Allow the old oil to completely drain into the pan. This may take several minutes.
– Once drained, clean the drain plug and inspect it for any metal shavings or damage.

– **Check and Replace Oil Filter** (if applicable):
– Locate the oil filter on the gearbox.
– Use an oil filter wrench to remove the old filter.
– Apply a thin layer of new oil to the rubber gasket of the new filter before installing it.
– Install the new oil filter by hand until snug, then tighten it slightly more with the wrench.

– **Replace Drain Plug**:
– After ensuring that all oil has drained, reinstall the drain plug and tighten it securely using the torque wrench to the manufacturer’s specifications.

– **Fill with New Oil**:
– Locate the gearbox fill plug, which is usually at the top or side of the gearbox.
– Remove the fill plug using the appropriate wrench.
– Using an oil pump or funnel, fill the gearbox with new oil until it reaches the recommended level, as indicated in the operator’s manual.
– Replace and tighten the fill plug securely.

– **Check the Oil Level**:
– If the gearbox has a dipstick or sight glass, check the oil level to ensure it is within the acceptable range.
– Add more oil if necessary, and recheck the level.

– **Clean Up**:
– Dispose of the old oil and filter according to local environmental regulations.
– Clean any spilled oil and remove tools from the work area.

– **Final Checks**:
– Start the Komatsu D375A-3 and let it run for a few minutes.
– Check for any leaks around the drain plug and oil filter.
– After confirming there are no leaks, turn off the machine and recheck the oil level, adding more if necessary.

– **Document the Service**:
– Record the date of the oil change, the type of oil used, and the machine’s operating hours for future reference.

By following these steps and using the appropriate tools, you can successfully change the gearbox oil on a Komatsu D375A-3, ensuring the machine operates efficiently and reliably. Always refer to the manufacturer’s manual for specific details and maintenance schedules.
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