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...