Craftsman
Air Compressor

Model #921166400 Craftsman air compressor

Here are the repair parts and diagrams for your Craftsman 921166400 air compressor. 

The diagram(s) below can help you find the right part.  If you’d like help, we invite you to call our customer service number at the top of the page, or click chat.

On this page, you can also find any manuals, installation guides and error code tables associated with this model.

For advice on diagnosing problems with appliances, lawn & garden equipment and other products, check out the videos, repair guides and articles in our DIY section.

Save to my profileOwner’s manual

Showing 10 of 31 parts

Air Compressor Pump Gasket Kit

#NI

Compressor Diagram

Air compressor pump gasket kit

Part #E100959

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

Air Compressor Air Filter

#6

Compressor Diagram

Air compressor air filter

Part #E100435

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

Air Compressor Check Valve

#36

Compressor Diagram

Air compressor check valve

Part #E101362

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

Air Compressor Vibration Isolator Pad

#42

Compressor Diagram

Air compressor vibration isolator pad

Part #E101037

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

Air Compressor Pressure Switch

#50

Compressor Diagram

Air compressor pressure switch

Part #E100957

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

Air Compressor Drain Valve

#43

Compressor Diagram

Air compressor drain valve

Part #E100098

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

Air Compressor Cylinder Head

#3

Compressor Diagram

Air compressor cylinder head

Part #E100227

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

Air Compressor Valve Plate Assembly

#9

Compressor Diagram

Air compressor valve plate assembly

Part #E100228

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

Handle Cap

#60

Compressor Diagram

Handle cap

Part #E101490

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

Air Compressor Cylinder

#13

Compressor Diagram

Air compressor cylinder

Part #E101113

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

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 check valve

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

Repair difficulty
Time required
 15 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 pressure switch

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

Repair difficulty
Time required
 45 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 Sears PartsDirect staff

Find out how to reduce air compressor noise.

April 21, 2015

How to maintain an oil-free air compressor

By Sears PartsDirect staff

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 Sears PartsDirect staff

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