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How do I remove the cover on my Hitachi air compressor

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I got a powermate 17 gal it wont shut off not until the breaker trips can't get the air set right on

Find the pressure switch. Remove the cover and loosen the spring loaded nuts on-till the switch opens. Readjust for the pressure you need. Keep it below the amp rating on the motor to keep the breaker from tripping. (RLA or FLA).

Dec 14, 2013 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Model ec 510 just won't start. Can't find the reset button, unit is only 4 months old

I just looked a the owners manual, did not see a reset, try taking the plastic cover off and see it the motor has a button on it to reset the motor, the motor may be damaged also, always try to use a direct connection to the wall outlet for power, Hitachi air compressors dont like extension cords.

Mar 08, 2011 | Hitachi Air Tools & Compressors

2 Answers

Very hard to start when cold, even in temps above freezing but below 60 degrees.

The early Hitachi EC89's came with a 40 microfarad capacitor to start the motor. This is insufficient when its cold, or the compressor hasn't been used in a while, or the compressor is still in its break-in period. Hitachi later changed it to a 60 microfarad capacitor, as it now is with the currently offered EC89's, which provides reliable and consistent starts of the electric motor. FYI: the capacitor is the white tube looking thing just under the black cover on the top side of the compressor. You can just see it without disassembling anything if you peek under the black cover to the best of your ability. To get at it you need to remove the black plastic cover. To do that, it takes about 20 minutes of disassembly time and a few tools: unplug the compressor, disconnect at least one end of the copper pressure tube (the tube that runs from the pump to the tank), remove the four main bolts that hold the black steel compressor base to the main frame, now you can get at the four phillips head screws that hold the plastic cover on, loosen (but don't remove) these four phillips head screws, then pop off the plastic cover (there are anti-vibration side locks that need to be disengaged- by using a long flat head screwdriver from the inside- to pry them and pop them off from the inside). Once the black cover is loose, you will either have to reach in and disconnect the two wires to the breaker, or unthread the breaker's little hex nut and separate it from the black cover. Replacing the 40 microfarad capacitor with a 60 microfarad capacitor (available at your local electric motor rebuilder- yellow pages) will resolve the problem of the weak starting motor that pops the breaker before the motor gets a chance to start rotating. Shame on Hitachi for not publishing this fix themselves.

Feb 27, 2011 | Hitachi EC89 4 Gallon Twin Stack Air...

1 Answer

We've had our compressor for about a year, and it suddenly stopped working and only hums when you turn it on, then flips the reset button (as someone previously stated). We tried leaving the valve open...

Failed capacitor will result in problem as you describe. Remove capacitor and have test. It should read/measure to 95% of stated valve. If cap test good, remove rear cover and manually turn fan. If frozen of hard to turn, drain oil and remove cylinder where it is attached to body and pull it off. From here you will be able to examine the piston, rod and crank. Good holidays.

Dec 12, 2010 | Hitachi EC12 Portable Electric 2hp Air...

2 Answers


what type of air compressor you have,since when you maintained it

Sep 23, 2009 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Air tank leaks along the weld


Jul 27, 2009 | Hitachi EC12 Portable Electric 2hp Air...

2 Answers

Hitachi ec12 motor hums after drop in pressue

There should be a pressure switch adjustment under the cover of the switch remove the cover and reset.

Feb 03, 2009 | Hitachi EC12 Portable Electric 2hp Air...

2 Answers

Ec12 hard restart after drop in air pressure

It sounds like the air pressure assembly unit is not reading the pressure drop. some of these units have adjustments under the covers and be reset.

Aug 31, 2008 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Coleman air compressor

Should be an electrical diagram on the motor. The motor name plate should also indicate if it is a dual voltage motor. There should be a cover on the end of the motor to access the terminals.

Aug 30, 2008 | Hitachi EC12 Portable Electric 2hp Air...

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