Caterpillar Hydraulic Excavator 323

The engine oil and filter change interval for standard service application is every 1000 hours when the following requirements are met:

• Utilize Cat Recommended Fluids

• Utilize S·O·S Services at recommended interval

When these requirements are not met, the oil and filter change interval should be every 500 hours, or use S·O·S Services oil sampling and analysis program to determine an acceptable oil change interval.

If you select an interval for oil and filter change that istoo long, you may damage the engine.

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.

Cooling System Coolant Extender (ELC) - Add

Cat HYDO Advanced 10 Oil Change Interval

Procedure to Change the Hydraulic Oil

Steps to change the hydraulic oil

Steps to clean the hydraulic tank screen

Steps to check Final Drive Oil Level

Final Drive Oil Sample - Obtain

Steps to obtain Final Drive Oil Sample

Fuel Lift Pump Strainer - Replace

Steps to replace Fuel Lift Pump Strainer

Fuel System Primary Filter (Water Separator) Element - Replace

Steps to replace Fuel System Primary Filter

Fuel System Secondary Filter - Replace

WARNING: Engine hood and engine hood parts can be hot while engine is running or immediately after engine shutdown. Hot parts or hot components can cause burns or personal injury. Do not allow these parts to contact your skin, when engine is running or immediately after engine shutdown. Use protective clothing or protective equipment to protect your skin.

WARNING: Personal injury can result from hot coolant, steam and alkali. At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.

NOTICE: Do not change the coolant until you read and understand the cooling system information in Special Publication, SEBU6250, “Caterpillar Machine Fluids Recommendations”. Failure to do so could result in damage to the cooling system components.

NOTICE: Mixing ELC with other products will reduce the effectiveness of the coolant. This could result in damage to cooling system components.

Unlatch the engine hood and raise the engine hood.

Slowly loosen the pressure cap that is on the coolant reservoir to release pressure from the cooling system.

Inspect the gasket on the pressure cap. If the gasket is damaged, replace the pressure cap.

Open the rear access door on the left side of the machine.