Caterpillar Mini Hydraulic Excavator 308.5

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

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

Remove oil drain plug, level plug, and filler plug. Allow the oil to drain into a suitable container.

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

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.

Battery or Battery Cable - Inspect/Replace

Blade Cutting Edges - Inspect/Replace

Every 10 Service Hours or Daily First 100 Hours

Note: Caterpillar recommends the use of 5% molybdenum grease for lubricating the blade linkage.

Refer to Special Publication, SEBU6250, “Caterpillar Machine Fluids Recommendations” for more information on molybdenum grease.

Wipe all fittings before you apply lubricant.

1. Apply lubricant through fitting (1). This fitting is on the rod end of the blade cylinder.

2. Apply lubricant through fitting (4). This fitting is on the head end of the blade cylinder.

3. Apply lubricant through fitting (2) and through fitting (3). These fittings are on the bar that supports the blade.

Boom and Stick Linkage - Lubricate

Note: Refer to Special Publication, SEBU6250, “Caterpillar Machine Fluids Recommendations” for more information on grease.

1. Wipe the fittings before lubricating the swing bearings.

Note: There are two fittings that need lubricant. One fitting is on the front of the swing bearing and one fitting is on the rear of the swing bearing.

2. Apply lubricant through both fittings until the lubricant comes out of the bearing (area (1) below the fitting).

3. Rotate the upper structure of the machine 90 degrees from the original position.

Note: The grease fitting rotates with the upper machine structure.

4. Apply lubricant through both fittings until the lubricant comes out of the bearing (area (1) below the fitting).

5. Repeat Step 3 and Step 4 until the upper structure has rotated 360 degrees.