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Hitachi
Air Compressor

Model # EC12 Official Hitachi air compressor

Here are the diagrams and repair parts for Official Hitachi EC12 air compressor, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 71 parts  |
Hitachi Motor 881-564
#38

Air compressor diagram

Hitachi motor

Part #881-564

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

Hitachi Cylind Head 881-550
#13

Air compressor diagram

Hitachi cylind head

Part #881-550

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

Hitachi Screw 881-551
#12

Air compressor diagram

Hitachi screw

Part #881-551

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

Hitachi Fan 881-565
#41

Air compressor diagram

Hitachi fan

Part #881-565

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

Hitachi Housing 881-568
#19

Air compressor diagram

Hitachi housing

Part #881-568

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

Hitachi Piston Pin 881-560
#9

Air compressor diagram

Hitachi piston pin

Part #881-560

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

Hitachi Gasket 4pk 881-555
#6

Air compressor diagram

Hitachi gasket 4pk

Part #881-555

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

Hitachi Gasket 881-473
#32

Air compressor diagram

Hitachi gasket

Part #881-473

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

Hitachi Rings 3pk 881-559
#8

Air compressor diagram

Hitachi rings 3pk

Part #881-559

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

Hitachi Joint 881-509
#55

Air compressor diagram

Hitachi joint

Part #881-509

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.

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Why does my air compressor safety valve keep popping open?

Main causes: bad safety valve, pressure switch failure…

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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…

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

Main cause: bad check valve…

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

Main cause: faulty output air pressure regulator…

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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…

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Why is my air compressor not turning on?

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

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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…

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

Main cause: bad air tank pressure gauge…

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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.

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How to replace an air compressor check valve

How to replace an air compressor check valve

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

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Repair difficulty
Time required
 15 minutes or less
How to rebuild an air compressor pump

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. …

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Repair difficulty
Time required
 45 minutes or less
How to replace an air compressor pressure switch

How to replace an air compressor pressure switch

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

Read more
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.

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How to reduce air compressor noise

How to reduce air compressor noise

Find out how to reduce air compressor noise.…

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The unseen dangers of air compressors

The unseen dangers of air compressors

Learn about the possible dangers associated with using an air compressor and how you can reduce the risks of property da…

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How to maintain an oil-free air compressor

How to maintain an oil-free air compressor

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

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