Caterpillar Mini Hydraulic Excavator 303C CR

Fuel Tank Water and Sediment - Drain

Swing Frame and Cylinder Bearings - Lubricate

Is the date of installation label attached to the seat belt retractor and buckle?

If the date of installation label is missing, replace belt within 3 years from the year of manufacture as indicated on belt webbing label, buckle housing, or installation tags (non-retractable belts).

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

Is the age of new seat belt determined before installing on seat?

A manufacture label is on belt webbing and imprinted on belt buckle. Do not exceed install by date on label.

Is the complete seat belt system installed with new mounting hardware?

Are date of installation labels marked and affixed to the seat belt retractor and buckle?

Note: Date of installation labels should be permanently marked by punch (retractable belt) or stamp (non-retractable belt).

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

Park the machine on level ground

Extend the stick and the bucket fully. Lower the boom so that the bucket is rested on the ground. Lower the blade to the ground.

Open the access cover for the hydraulic tank. Clean the area around the hydraulic oil filler cap in order to prevent dirt from entering the hydraulic tank.

Relieve the internal pressure from the hydraulic tank by loosening the hydraulic oil filler cap. After the pressure is relieved, remove the hydraulic oil filler cap.

Remove the hydraulic oil drain plug. Allow the oil to drain into a suitable container.

Clean the drain plug and inspect the drain plug. Replace the drain plug if the drain plug is damaged or worn. Reinstall the plug.

Remove bolt (1), washer (2), and left cover (3).

Clean the battery surface with a clean cloth

Keep the terminals clean and keep the terminals coated with petroleum jelly

Install the post cover after you coat the terminal post with petroleum jelly

Tighten the hold-downs for the battery in order to prevent the batteries from moving during machine operation

Ensure that the engine can not be started while this maintenance is being performed

Allow additional time for the engine to cool before measuring/adjusting valve lash clearance

Boom and Stick Linkage - Lubricate

Boom, Stick, and Frame - Inspect

Final Drive Oil Sample - Obtain

Fuel System Primary Filter (Water Separator) Element - Replace

Fuel Tank Cap and Strainer - Clean

Hydraulic System Oil Filter (Return) - Replace

Hydraulic System Oil Sample - Obtain

Sign off on the 500 Hourly Mini Hydraulic Excavator Maintenance