BASE ASSEM. 4N5490 - Caterpillar

Do not disconnect the air line from the air compressor governor without purging the air brake and the auxiliary air systems. Failure to purge the air brake and the auxiliary air systems before removing the air compressor and/or the air lines could cause personal injury.
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Air compressor motor assembly
If the air compressor pressure relief valve that is mounted in the air compressor cylinder head is bypassing compressed air, there is a malfunction in the air system, possibly ice blockage. Under these conditions, your engine may have insufficient air for normal brake operation.Do not operate the engine until the reason for the air bypass is identified and corrected. Failure to heed this warning could lead to property damage, personal injury, or death to the operator or bystanders.
For Operation and maintenance procedures and OEM specifications of air compressor components refer to the Special Instruction, REHS9687 Consult your Caterpillar dealer for assistance.The following table represents the Standard (Prime/Continous)maintenance interval schedule:
Table 1
Air Compressor Standard Maintenance Intervals
Description Maintenance Interval
When Required Every 1,000 Hours Every Year
Air Compressor Air Filter with Pre-filter - Change X
Air Compressor Oil Level - Check X
Air Compressor Oil/ Water Separator Water - Test X
Air Compressor Oil and Filter - Change X
Air Compressor Oil Separator - Change X
Air Compressor Motor Bearings - Lubricate X
Air Compressor Pre-filter Element - Change X
Air Compressor After-filter Element - Change X
Air Compressor Water Filter - Change X
Air Compressor Oil/ Water Separator Filter Element - Change X
Air Compressor Dessicant Dryer Element - Change X
Air Compressor Zero Air Loss Drain Service Unit - Change X The following table represents the Standby maintenance interval schedule:
Table 2
Air Compressor Standby Maintenance Intervals
Description Maintenance Interval
When Required Every 1,000 Hours Every 3 Years
Air Compressor Air Filter with Pre-filter - Change X
Air Compressor Oil Level - Check X
Air Compressor Oil/ Water Separator Water - Test X
Air Compressor Oil and Filter - Change X
Air Compressor Oil Separator - Change X
Air Compressor Motor Bearings - Lubricate X
Air Compressor Pre-filter Element - Change X
Air Compressor After-filter Element - Change X
Air Compressor Water Filter - Change X
Air Compressor Oil/ Water Separator Filter Element - Change X
Air Compressor Dessicant Dryer Element - Change X
Air Compressor Zero Air Loss Drain Service Unit - Change X