Craftsman
Air Compressor

Model #921166380 Official Craftsman air compressor

Here are the diagrams and repair parts for Craftsman 921166380 air compressor, as well as links to manuals and error code tables, if available.

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Owner’s manual

Showing 10 of 35 parts

Air Compressor Piston Kit

#NI03

All parts Diagram

Air compressor piston kit

Part #E100251

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Vibration Isolator Pad#25

Air compressor Diagram

Air compressor vibration isolator pad

Part #E100240

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Cylinder Head#3

Air compressor Diagram

Air compressor cylinder head

Part #E100227

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Pressure Gauge, 1.5-in, 200-PSI#38

Air compressor Diagram

Air compressor pressure gauge, 1.5-in, 200-psi

Part #E100093

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Pressure Switch#40

Air compressor Diagram

Air compressor pressure switch

Part #E101348

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Pressure Relief Tube Kit

#NI07

All parts Diagram

Air compressor pressure relief tube kit

Part #E101402

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Pressure Regulator#37

Air compressor Diagram

Air compressor pressure regulator

Part #E100059

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Shroud#22

Air compressor Diagram

Air compressor shroud

Part #E101137

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Check Valve#32

Air compressor Diagram

Air compressor check valve

Part #E101208

The manufacturer no longer makes this part, and there's no substitute part

Air Compressor Pump Gasket Kit

#NI02

All parts Diagram

Air compressor pump gasket kit

Part #E100959

The manufacturer no longer makes this part, and there's no substitute part

Symptoms common to all air compressors

Choose a symptom to see related air compressor repairs.

Main causes: rusted air tank, loose air tube fitting connections, bad check valve, leaky safety valve, bad tank drain valve
Main causes: bad safety valve, pressure switch failure
Main causes: loose air tube fitting connections, bad check valve, faulty safety valve, damaged or corroded air tank, bad air pump
Main causes: tank drain valve open or leaking air, leaky air tank, bad safety valve, worn pump seals, bad pump valve plate
Main causes: lack of electrical power, check valve failure, bad pressure switch

Repair guides common to all air compressors

These step-by-step repair guides will help you safely fix what’s broken on your air compressor.

How to replace an air compressor pressure switch

You can replace a broken air compressor pressure switch in about 45 minutes.

Repair difficulty
Time required
 45 minutes or less
May 1, 2015
By Lyle Weischwill
How to rebuild an air compressor pump

If the air compressor won't fill the tank with compressed air, rebuild the pump using these steps in about 45 minutes.

Repair difficulty
Time required
 45 minutes or less
How to replace an air compressor check valve

You can replace a defective air compressor check valve in about 10 minutes.

Repair difficulty
Time required
 15 minutes or less

Articles and videos common to all air compressors

Use the advice and tips in these articles and videos to get the most out of your air compressor.

April 24, 2015

How to reduce air compressor noise

By Lyle Weischwill

Find out how to reduce air compressor noise.

April 21, 2015

How to maintain an oil-free air compressor

By Lyle Weischwill

Learn how to maintain an oil-less air compressor for safe and efficient operation.

April 21, 2015

How to maintain an oil-lubricated air compressor

By Lyle Weischwill

See how to perform routine maintenance on your oil-lubricated air compressor.