Model # 921166430 Official Craftsman air compressor

Here are the diagrams and repair parts for Official Craftsman 921166430 air compressor, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

Click a diagram to see the parts shown on that diagram.
In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual

Model diagram and schematic

SEARCH WITHIN THIS MODEL

ALL PARTS

Showing 10 of 22 parts |

#NI04

All parts diagram

Air compressor wheel kit

Part #E102369

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

#41

Air compressor diagram

Air compressor check valve

Part #E100898

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

#36

Air compressor diagram

Tube

Part #E103637

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

#42

Air compressor diagram

Hose

Part #E103638

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

#51

Air compressor diagram

Air compressor drain valve

Part #E101717

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

#34

Air compressor diagram

Air compressor outlet tube

Part #E103636

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

#37

Air compressor diagram

Air compressor safety valve

Part #E102612

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

Companion Air Compressor Intake Filter Kit E100794

#NI03

All parts diagram

Companion air compressor intake filter kit

Part #E100794

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

#NI02

All parts diagram

Air compressor valve plate kit

Part #E103497

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

Companion Air Compressor Quick-connect Hose Coupler E100307

#46

Air compressor diagram

Companion air compressor quick-connect hose coupler

Part #E100307

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

Most common symptoms to help you fix your air compressors

Choose a symptom to see related air compressor repairs.

View all

Why does air leak from my air compressor?

Main causes: loose air tube fitting connections, bad check valve, faulty safety valve, damaged or corroded air tank, bad…

Why won't my air compressor start with a full air tank?

Main cause: bad check valve…

Why won't my air compressor build tank pressure?

Main causes: tank drain valve open or leaking air, leaky air tank, bad safety valve, worn pump seals, bad pump valve pla…

Why won't my air compressor tank hold air?

Main causes: rusted air tank, loose air tube fitting connections, bad check valve, leaky safety valve, bad tank drain va…

Why does my air compressor safety valve keep popping open?

Main causes: bad safety valve, pressure switch failure…

Why can't I adjust the output air pressure on my air compressor?

Main cause: faulty output air pressure regulator…

Why doesn't my air compressor's pressure gauge work?

Main cause: bad air tank pressure gauge…

Why is my air compressor not turning on?

Main causes: lack of electrical power, check valve failure, bad pressure switch…

Most common repair guides to help fix your air compressors

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

View all

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

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

Effective articles & videos to help repair your air compressors

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

View all

Model # 921166430 Official Craftsman air compressor

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Most common symptoms to help you fix your air compressors

Why does air leak from my air compressor?

Why won't my air compressor start with a full air tank?

Why won't my air compressor build tank pressure?

Why won't my air compressor tank hold air?

Why does my air compressor safety valve keep popping open?

Why can't I adjust the output air pressure on my air compressor?

Why doesn't my air compressor's pressure gauge work?

Why is my air compressor not turning on?

Most common repair guides to help fix your air compressors

How to replace an air compressor pressure switch

How to rebuild an air compressor pump

How to replace an air compressor check valve

Effective articles & videos to help repair your air compressors

How to tell if a fuse is blown

How to reduce air compressor noise

How to maintain an oil-lubricated air compressor

Parts & More

Stay Connected

Quick links

Let us help you

More resources