428F, 432F, 434F and 444F Backhoe Loaders Caterpillar

Operate the machine for a few minutes in order to warm the transmission oil.

The machine should be level. Lower the bucket to the ground and apply slight downward pressure. Engage the parking brake and stop the engine.

Illustration 1	g01204396
Drain plug for direct drive transmission

Illustration 2	g01204398
Drain plug for power shift transmission

1. Remove the transmission drain plug. Allow the transmission oil to drain into a suitable container. Clean the transmission drain plug and install the transmission drain plug.

2. Change the transmission oil filter element. Refer to Operation and Maintenance Manual, "Transmission Oil Filter - Replace".

3. Clean the transmission magnetic screen. Refer to Operation and Maintenance Manual, "Transmission Magnetic Screen - Clean".

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Illustration 3	g02669396

4. Remove the transmission breather from the top of the transmission case. Clean the breather in clean nonflammable solvent and allow the breather to dry. Replace the breather.

5. Open the engine access door on the top of the machine.

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Illustration 4	g02709942

6. Remove the oil level gauge/fill cap and fill the transmission with transmission oil. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" and Operation and Maintenance Manual, "Capacities (Refill)".

7. Start the engine and run the engine at low idle. Apply the service brake. Slowly operate the transmission controls in order to circulate the oil.

8. Move the transmission control lever to NEUTRAL and engage the parking brake. Inspect the transmission for leaks.

9. Maintain the transmission oil level within the crosshatched region on the "CHECK WITH OIL WARM" side of the oil level gauge when the transmission is warm. Add transmission oil through the transmission filler tube, if necessary.

   Note: The transmission can be checked with cold transmission oil. Ensure that the oil level is within the crosshatched region on the "Safe to Start" side of the oil level gauge/fill plug. Add transmission oil, if necessary.

10. Install the oil level gauge/fill cap and install the engine access door.

11. Stop the engine.