A Step-by-Step Guide: How to Change Differential & Final Drive Oil for Caterpillar 950F using CAT ET

Regular maintenance plays a vital role in ensuring the smooth functioning and longevity of heavy machinery like the Caterpillar 950F. One essential maintenance task is changing the differential and final drive oil. In this comprehensive guide, we will walk you through the step-by-step process of changing the differential and final drive oil for your Caterpillar 950F using the CAT ET (Electronic Technician) diagnostic tool.

Tools Required:
To successfully complete the oil change, you will need the following tools:
1. CAT ET diagnostic tool
2. CNH DPA5 kit diagnostic tool
3. John Deere Service Advisor EDL
4. JPRO Heavy Truck Diagnostic Scanner
5. Volvo Vocom Adapter

Step 1: Preparation
1. Park the Caterpillar 950F on a flat surface and engage the parking brake.
2. Ensure the machine is turned off and the engine is cool before proceeding.

Step 2: Accessing the Differential and Final Drive
1. Using the CAT ET diagnostic tool, connect to the Caterpillar 950F's electronic system.
2. Navigate to the "Service" or "Maintenance" section and select "Differential and Final Drive."

Step 3: Draining the Old Oil
1. Locate the drain plug on both the differential and final drive.
2. Position an oil catch pan underneath the drain plugs.
3. Loosen the drain plugs using the appropriate tools.
4. Allow the old oil to drain completely.

Step 4: Inspecting the Drain Plugs
1. Remove the drain plugs and inspect them for any metal shavings or debris.
2. Clean the drain plugs thoroughly and reinstall them once the inspection is complete.

Step 5: Refilling with New Oil
1. Refer to the Caterpillar 950F's user manual or specifications for the recommended oil type and quantity for the differential and final drive.
2. Using a funnel, pour the new oil into the respective fill holes.
3. Monitor the oil level closely to ensure it reaches the recommended level.

Step 6: Completing the Process
1. Once the new oil is filled to the appropriate levels, reinstall the fill hole plugs securely.
2. Disconnect the CAT ET diagnostic tool from the electronic system.
3. Start the Caterpillar 950F and allow it to run for a few minutes to ensure proper oil circulation.
4. Check for any leaks or abnormalities in the oil system.
5. Double-check the oil levels and make any necessary adjustments.


Regularly changing the differential and final drive oil is crucial to maintain the performance and durability of your Caterpillar 950F. By following this step-by-step guide and utilizing diagnostic tools like the CAT ET, CNH DPA5 kit, John Deere Service Advisor EDL, JPRO Heavy Truck Diagnostic Scanner, and Volvo Vocom Adapter, you can ensure a seamless and efficient oil change process. Remember, proper maintenance leads to enhanced productivity and longevity for your heavy machinery.