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Old 08-24-2009, 07:52 PM
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Problem with air compressor I assembled

I made me an air compressor from an oilless campbell hausfeld tank.I have a 3 hp central pnuematic and a 3 hp 230 v motor.I left the old check valve in the tank.It builds up air fine but when air pressure gets to about 75 lbs starts blowing oil out of vent.I mean alot of oil.I called hf and they said it justs needs to break in.Everything seems to work fine but continues to blow oil.I got a repacement pump from hf but it still blows out oil. The only thing that I can think of is the check valve.Does this seem right? Give me some ideas thanks proge

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Old 08-24-2009, 09:35 PM
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Wow, same rare problem twice in two weeks!

The check valve is probably the problem although it should not blow a lot of oil like that, maybe after the rings seat it would help but it would not eliminate the problem completely. If the valve is ok and it is just pump blow-by I seriously doubt the rings will ever seal enough to stop that much leakage. Check that in-tank valve, if the oil and air continues to blow out even after the pump stops it is the valve but if it is good then you need to complain to HF. I have installed a couple of the 5 HP V-type pumps and they seem to be good ones but a couple of the guys here had bad luck with the 3 HP version.

I figure you probably already know this but it is worth repeating anytime someone is working on a compressor especially around that tank valve, BE CAREFUL! make darn SURE the tank is empty and the water drain valve is left open before you disassemble anything. People have been seriously hurt and even killed just by removing the head from a pump so make sure the pressure is gone before removing that first bolt.
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