ec12 sometimes won't start
ec12 fills to 125, stops but bleeds off to start pressure but wont fire up. This can happen at different times, works great other times. I think it is the non return valve (item 53) Help
Hitachi EC 12 bogging down and not running
Hi this Peter .
I have a Hitachi EC 12 twin tanks.it bogging down not running.
I checked capacitor,replaced with capacitor made by Packard ,model Prcf40 40ufd :5. 440vac 60/50hz from the local a/c store.
The original is made by Facon mod 7G73400P7B 40 uF: 5 SH. 450 Vac cl.D 50Hz .
But it doesn't work either.
You think I should install the OMD so it can works .
The capacitor from Hitachi is so expensive $38 a each or you think just keep the money and by a new one.
It is ten years old. I want to make sure it work before order the capacitors .
Peter, are you sure it is the cap? How did you test it?
When you acquired the replacement, did you take the old one and ask the store person to give you the exact replacement?
As I've often said, I am not an electrical guy. I build air circuits. So, if you don't have the exact replacement capacitor, or if you haven't checked the old cap (you say you did, but how?) then it may not even be the cap that's at fault.
At what pressure is your compressor bogging down? Is it at the same pressure every time, or does that vary? What is the circuit amperage? Are you using an extension cord? (Don't) With the intake filter removed, do you still get the same issue?
There are a host of things, including a cap problem, that can cause a compressor to bog down.
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Hitachi EC12 pressure switch releasing air at cut-out pressure
I have a Hitachi EC12.
The existing pressure switch was a MDR 21(?) 4 port switch.
That one had the symptom of setting off the safety valve at the cut-out pressure (~125 psi).
The valve was rated at 10 bar (~145 psi), so I'm assuming there was some mechanical method to cause the valve to release or it was faulty.
I've replaced the pressure switch (with http://www.ebay.com/itm/Air-Compressor-Pressure-Switch-Hitachi-882-609-PS104PPL-/400380488858?ssPageName=ADME:L:OC:US:3160) and the valve. I think I've installed everything properly, but now, the pressure switch stops the motor at the cut-out pressure (~120) and releases air through the back of the switch (the safety valve appears closed).
Just wondering if that rings a bell with anyone. I don't think there's an issue with the safety valve, unloader tube, etc. because the tank is able to reach "max" pressure with any apparent leaks. It appears like the switch itself is releasing the air pressure once it reaches the cut-out pressure.