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Model # 921166390 Official Craftsman air compressor
Here are the diagrams and repair parts for Official Craftsman 921166390 air compressor, as well as links to manuals and error code tables, if available.
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921166390 Power Tools
#10
Air compressor diagram
Air compressor reed valve
Part #E100229
The manufacturer no longer makes this part, and there's no substitute part
#NI08
All parts diagram
Tube kit
Part #E101429
The manufacturer no longer makes this part, and there's no substitute part
#58
Air compressor diagram
Air compressor shroud
Part #E101137
The manufacturer no longer makes this part, and there's no substitute part
#55
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
#55
Air compressor diagram
Task force air compressor pressure regulator
Part #E100059
The manufacturer no longer makes this part, and there's no substitute part
#36
Air compressor diagram
Air compressor check valve
Part #E100898
The manufacturer no longer makes this part, and there's no substitute part
#NI06
All parts diagram
Air compressor crankcase cover kit
Part #E101332
The manufacturer no longer makes this part, and there's no substitute part
#4
Air compressor diagram
Air compressor exhaust elbow
Part #E100809
The manufacturer no longer makes this part, and there's no substitute part
#NI05
All parts diagram
Craftsman handle ki
Part #E101492
The manufacturer no longer makes this part, and there's no substitute part
#9
Air compressor diagram
Air compressor valve plate assembly
Part #E100228
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.
Main cause: bad check valve…
Main causes: tank drain valve open or leaking air, leaky air tank, bad safety valve, worn pump seals, bad pump valve pla…
Main cause: faulty output air pressure regulator…
Main cause: bad air tank pressure gauge…
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…
Main causes: rusted air tank, loose air tube fitting connections, bad check valve, leaky safety valve, bad tank drain va…
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.
![How to replace an air compressor check valve](https://images.ctfassets.net/fpe0ec7r30ix/3DlFd7jSbdpepXZwoeQWOf/773e4eb7eec7e69d1ca8369ad32cbabd/RG-ACOM-Replace-Air-Compressor-Check-Valve-Intro-Image.jpg?fm=png&w=270&h=270)
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
![How to replace an air compressor pressure switch](https://images.ctfassets.net/fpe0ec7r30ix/4c1jGdaQudYugHgEfimRCh/bff0ae97711d03f7113554aebdb91515/RG-ACOM-Replace-Air-Compressor-Pressure-Switch-Intro-Image.jpg?fm=png&w=270&h=270)
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](https://images.ctfassets.net/fpe0ec7r30ix/6pOqS7AE51GYh2xrfFOXcP/8370a39e5e68b0b544470d793452df48/RG-ACOM-Rebuild-Air-Compressor-Pump-Intro-Image.jpg?fm=png&w=270&h=270)
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
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.
![How to reduce air compressor noise](https://images.ctfassets.net/fpe0ec7r30ix/5VXWaYxbdAqcGI8LazvCIN/90bb0ab37278bffc1fa1eb98a4b6ad5b/ART-ACOM-How-to-Reduce-Air-Compressor-Noise.jpg?fm=png&w=270&h=270)
Find out how to reduce air compressor noise.…
![The unseen dangers of air compressors](https://images.ctfassets.net/fpe0ec7r30ix/5y4vc0uys5UPOeBltTcJjA/2425cf70545aebee7c054485defb24de/ART-ACOM-The-Unseen-Dangers-of-Air-Compressors.jpg?fm=png&w=270&h=270)
Learn about the possible dangers associated with using an air compressor and how you can reduce the risks of property da…
![How to maintain an oil-free air compressor](https://images.ctfassets.net/fpe0ec7r30ix/75wJkikOoNxXPleCuhIRgU/9b001c1c290d5a75249ed0be8da2d901/ART-ACOM-How-to-Maintain-an-Oil-Free-Air-Compressor.jpg?fm=png&w=270&h=270)
Learn how to maintain an oil-less air compressor for safe and efficient operation.…