Craftsman 921.1521 owner manual Storage, Maintenance

Maintenance

NOTE: Any service procedure not covered in the maintenance schedule below should be performed by qualified

service	personnel.
Items to Check/Change			Before each	After first	Every
			use or daily	10 hours	100 hours
Check Tank Safety		Valve	X
Overall	Unit Visual	Check	X
Check	Oil Level		X
Change Oil				X	X
Check Air Filter (more frequently in dusty or humid environments)			X

To ensure efficient operation and longer life of the air compressor unit, a routine maintenance schedule should be followed. The following schedule is geared toward a consumer whose compressor is used in a normal working environment on a daily basis. If necessary, the schedule should be modified to suit the conditions under which your compressor is used. The modifications will depend upon the hours of operation and the working environment. Air compressors used in an extremely dirty and/or hostile

environment will require a greater frequency of all maintenance checks.

The air compressor should be turned off and unplugged from the power source before any maintenance is performed as well as the air bled from the tank and the unit allowed time to cool. Personal injuries could occur

from moving parts, electrical sources, compressed air or hot surfaces.

Oil Changing

For changing the pump oil, be sure to do the following:

1.Turn the unit off and unplug the power cord from the receptacle.

2.Allow the compressor time to cool if it has been in operation.

3.Open the drain valve to bleed all air from the tank.

4.Close the drain valve.

5.Remove the oil fill cap on the pump.

6.Remove the sight glass with a box end wrench or socket. Drain the oil into a suitable container and

dispose of properly. The compressor may need to be tipped slightly towards the drain hole to allow all of the oil to drain.

7.Reattach the sight glass. Note: Torque the sight glass 10-12 inch Ibs. when re-assembling. Be sure the gasket is between the sight glass and the pump crankcase.

8.Refill the compressor pump with an air compressor oil such as SAE-30 non-detergent (API CG/CD Heavy Duty) oil at slow intervals until the oil reaches the center

of the red circle in the sight glass. Use a SAE-10 during extreme winter conditions.

Storage

For storing the air compressor, be sure to do the following:

1.Turn the unit off and unplug the power cord from the receptacle.

2.Remove all air hoses, accessories, and air tools from the air compressor.

3.Perform the daily maintenance schedule.

4.Open the drain valve to bleed all air from the tank.

5.Close the drain valve.

6.Store the air compressor in a clean and dry location.

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