Caterpillar Mini Hydraulic Excavator 303C CR

Inspect the belts for wear and for cracking

Water Pump Belt, Fan Drive Belt, and Alternator Belt

Apply approximately 98 N (22 lb) of force midway between the pulleys

Measure the deflection of the belt. The belt should deflect 8 to 11 mm (5/16 to 7/16 inch)

If the deflection is not correct, loosen alternator mounting bolt (4) and adjusting bolt (1). Move the alternator forward and backward in order to adjust belt (5) to the specified tension

When the adjustment is correct, tighten adjusting bolt (1) and mounting bolt (4) securely

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: Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loose the cap slowly to relieve the pressure.

Cooling System Coolant Extender (ELC) - Add

For additional information on the addition of extender, see Operation and Maintenance Manual, SEBU6250, “Caterpillar Coolant Recommendations” or consult your Caterpillar dealer.

Sign off on the maintenance procedure

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).

Remove spring (4) and screen (5).

Cooling System Coolant Sample (Level 2) - Obtain

Refer to Operation and Maintenance Manual, “Cooling System Coolant Sample (Level 1) - Obtain” for the guidelines for proper sampling of the coolant.

Sample of the coolant obtained as close as possible to the recommended sampling interval?

Supplies for collecting samples can be obtained from your Cat dealer.

Sample submitted for Level 2 analysis?

For additional information about coolant analysis, refer to Special Publication, SEBU6250, “Caterpillar Machine Fluids Recommendations” or consult your Cat dealer.

Sign off on the coolant sample collection and analysis