Bostitch 6 gal pancake compressor starts, then shuts off.

by Paul
(Snohomish)

I have a Bostitch 6 gal pancake compressor. After plugging it in, i pull the knob out to start building pressure. It starts, but then shuts off in less than 10 seconds. It sometimes restarts, but then runs for only a couple seconds, then shuts off again. Good 20amp power supply. Tank pressure starting at 0 psi. Any ideas? Thanks.

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If this were my compressor Paul I'd use a multi-meter to check the power on the compressor motor side of the switch after the compressor shuts off, assuming that the tank pressure is below the normal compressor cut out.

If the tank pressure is zero, and the pressure switch is not allowing power to flow through it to the motor circuit, then the pressure switch has tripped to off, and, that makes me suspect that the pressure switch itself is the problem.

Cheers,

Bill

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bostich ol 195 compressor

by Steve
(tn)

I have ol 195 bostich.

It was not building pressure much at all.

opened and found flapper valve broken on one.

Bought retro kit and changed it over to new kind, piston head, gaskets, head,etc.

Now it builds to 20_30 psi and just runs. May be check valve, or pressure switch, what else ?
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It is doubtful that it is the pressure switch Steve, as the purpose of that switch is to turn the air compressor on when the pressure in the tank is low enough, and to turn it off when the pressure in the compressor tank gets high enough.

In between those two pressure settings the pressure switch does not provide any function except to let power flow to the motor circuit.

If the compressor is running and getting up to 20-30 PSI and no higher pressure, then the typical compressor problems are plugged intake filter, damaged intake valve, damaged pressure valve, piston seals or, and what is most likely in your case I would guess, is the internal gasket(s) are leaking.

Did you replace all gaskets with new, or use the old?

Cheers,

Bill


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reset switch trips often

by Rich
(River Vale, NJ)

On cold days I let the compressor reach room temp or use a heat gun to warm the oil. In warmer weather I find that most time it starts fine. However there are times that I need to plug the unit into a 20 amp. circuit, but not always. Whats up?
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As far as I'm concerned a compressor should be plugged into a 20 amp circuit as a norm, Rich.

Assuming the reset switch itself is not faulty, then I would think that it's the power supply, not necessarily from the socket (unless you are using a power bar or extension cord) but from the start capacitor.

My guess is that your start cap is failing.

Bill


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Will only got up to 40 lbs and will not shut off.

by J. Corder
(Aliceville, Alabama)

The compressor will only build up 40 lbs and will not shut off. I did check the head and the middle gasket is detoriated. Thanks.
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Well, since your Bostitch air compressor symptoms are in keeping with either a failed intake or pressure valve, or a blown gasket, I suspect you've hit the problem on the head.

Worn gaskets can often seal under lower pressure, but as the back pressure in the tank grows and the compressor pump has to work harder to push air into the tank, a weak gasket will let go at the higher pressure and create the scenario you describe.

Replace the gaskets, make sure the valve plates are good - replace them if they are at all suspect because they will go next, and that should take care of it.

Bill

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