Caterpillar Caterpillar Hydraulic Excavator 320 320

Is the date of installation label present?

If the date of installation label is missing, replace the belt within 3 years from the year of manufacture.

Year of manufacture as indicated on the belt webbing label, buckle housing, or installation tags

Consult your Cat dealer for the replacement of the seat belt and the mounting hardware.

Manufacture date of the new seat belt

Does the manufacture date of the new seat belt exceed the install by date on the label?

A complete seat belt system should be installed with new mounting hardware.

Diesel Exhaust Fluid Filter - Replace

Open the Diesel Exhaust Fluid (DEF) compartment.

Ensure that the area around the DEF filter is clean and free from dirt. The DEF filter threaded cap and the filter element are a combined assembly.

Remove the protective cover (1) from DEF pump housing (2).

Remove the DEF filter assembly (3) and discard.

Install a new DEF filter assembly into the DEF pump housing.

Tighten the filter assembly to 10 N·m (88.5 lb in). Install the protective cover.

Turning on the power will automatically prime the DEF system.

Sign off on the 1500 Hourly Hydraulic Excavator Maintenance

Diesel Exhaust Fluid Injector - Replace

Receiver Dryer (Refrigerant) - Replace

10000 Hourly Hydraulic Excavator Maintenance: DEF Manifold Filters - Replace

Sign off on the 5000 Hourly Hydraulic Excavator Maintenance

Hydraulic System Oil Filter (Return) - Replace

WARNING: Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.

The return filter is a cartridge type filter. The amount of foreign material that enters the hydraulic system is reduced when the filter element is replaced.

Two different filters are available for the return filter. One filter is used for standard applications such as digging and normal use of a hammer. The second filter is used for an application such as demolishing a ceiling in a tunnel with a hammer.

Note: If the message display shows that the hydraulic return filter is plugged, turn off the machine. After you make sure that the warning has disappeared, start the machine and run the machine on level ground for approximately 10 minutes. If the warning still appears in the message display, inspect the filter and replace the filter, if necessary.

The use of hydraulic hammers shortens the life of hydraulic oil. If a hydraulic hammer is used, the maintenance interval is shortened, refer to Table43 for the intervals.

Return Filter Replacement Procedure

1. Remove five bolts (1) and washers (2). Remove cover (3) from the top of the hydraulic tank.

Steps to check the Final Drive Oil Level

Final Drive Oil Sample - Obtain

Steps to obtain the Final Drive Oil Sample

Fuel Lift Pump Strainer - Replace

Steps to replace the Fuel Lift Pump Strainer

Fuel System Primary Filter (Water Separator) Element - Replace

Steps to replace the Fuel System Primary Filter

Fuel System Secondary Filter - Replace