Caterpillar Mini Hydraulic Excavator 308 CR

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).

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.

Sign off on the 100 Hourly Mini Hydraulic Excavator Maintenance

Engine Crankcase Breather - Replace

Open the engine access door at the rear of the machine. Refer to Operation and Maintenance Manual, “Access Doors and Covers”.

The engine crankcase breather is located in the engine compartment on the right-hand side of engine. A replaceable filter element is located inside the engine crankcase breather.

Remove cover (4) and remove filter element (2).

Clean housing (1) and cover (4).

Inspect O-ring for damage. Replace if necessary.

Install a new filter element and Install cover (4).

Sign off on the maintenance procedure

Air Conditioner/Cab Heater Filter (Recirculation) - Replace

An air recirculation filter element plugged with dust will result in decreased performance and service life to the air conditioner or cab heater.

To prevent decreased performance, clean the filter element, as required.

The cab recirculation air filter is located in the cab, near the floor left of the operator seat.

1. To remove the filter element (1), depress the locking tab and pull out the filter towards the front of the cab.

2. Install the air filter ensuring that the locking tabs are in engaged.

Boom and Stick Linkage - Lubricate

Note: Cat recommends the use of 5% molybdenum grease for lubricating the boom, stick, and bucket control linkage. Refer to Special Publication, SEBU6250, “Caterpillar Machine Fluids Recommendations” for more information on molybdenum grease.

Position one final drive so that oil drain plug is at the bottom

Remove oil drain plug, level plug, and filler plug

Clean the plugs and inspect the plugs

Apply pipe sealant to oil drain plug, level plug, and filler plug

Add oil through the opening of filler plug

Fill the final drive to the bottom of the opening for level plug

Install level plug and filler plug