20 Most Recent Hitachi EC12 Portable Electric 2hp Air Compressor, Oil Lubricated - Page 2 Questions & Answers

look for a bad start capacitor.

possibly a bad capacitor or motor

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).

It sounds like your car ran out of oil and the engine seized

I would not worry. Drain the tank completely, and check the oil in the compressor, top off if necessary. Watch it for the first cycle.

The non-return valve is sticking and it's an easy fix. First, for safety, unplug the electric power to the unit and release any pressure in the tanks. Then unscrew the cap of the non-return valve (between the compressor and the tanks). Inside you should find a tapered rubber plug which is probably sticking in the valve housing. Sand down the diameter of the large end of the plug, being careful not to damage the flat face at the narrow end (which is the sealing surface). For sanding try 400 or 600 grade wet-or-dry paper and sand until the plug just moves freely in the housing. Reassemble and the compressor should work. Incidentally it's an oil-type unit, and quite durable. Make sure it has enough oil.

Most P/C compressors shut off at 150psi. If the pressure switch is bad, the pressure will rise until the safety pops. If the safety is not opening, then most likely the cylinder / piston ring is worn to the point that pressure will not increase past safety range (cylinder could be scratched near top ). If cylinder and piston are ok, then air is leaking somewhere (check all joints with soapy water). Good luck

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

what is the working pressure bud

The regulator sounds like it is cranked closed. Try slowly operating the adjusting knob in the opposite direction. As the valve moves, you should see the pressure rise on your gauge (it probably does work).
Hope this helps....now go make something!
Best regards, --W/D--

With a 110, you do not need a Capacitor

About the best that you could do is compromise between using one cord and more hose. Your compressor draws about 15amps and will probably draw more as the units heats up. One 12 gauge 100' cord will most likely give you enough power to run the compressor (do not use 14 or 16 gauge). (depends on strength of outlet) There is a voltage drop of about 7.5 volts on 100 feet but should deliver 15 - 20 amps. Best to test with meter as compressor runs to prevent damage to capacitors. Now for the hose, that leaves about 250 feet to reach project. Pressure drops in the hose depending on inside diameter up to 40 psi per length. If you used a 1/2id x100 hose at the compressor then the rest 3/8 id or maybe 1/4 you may have enough to power your gun. Another consideration to get more pressure is to use maybe 100' or more threaded pvc pipe or metal pipe 3/4 or 1"id. Finally to get plenty of volume at the gun, you could use a small air tank (3-4 gal) at the end of the run then another jumper hose from the small tank to the gun. Unusual circumstances/challenge makes for unusual solutions. Good Luck on your project.

Bad cord or pressure switch maybe

First you have to remove the motor/pump assembly from the frame to get access to the motor housing screws. You'll have to remove the infeed tube. The power cord from the pressure switch may or may not have to be removed depending on how much slack there is. Remove the motor housing and the fan is right there bolted/screwed to the armature.

Remove the motor base from the tank frame so you can get at the screws on the back of the motor housing. Remove the infeed line running from the pump to the tank and the motor power line at the pressure switch if there isn't enough slack to swing the motor out. Remove the motor housing. Touch a screwdriver to both posts on the capacitor to make sure it's discharged. Remove the two wires on top of the capicitor and take the bolt off the back to remove it from the motor housing. Reverse everything putting it back together.