Central Pneumatic 67847 tripping reset switch?

by Jim

Central Pneumatic 2.5 Hp 21 gallon 125psi air compressor model 67847

This compressor is 7 years old and is used occasionally. Mainly used for airing up tires, and to operate different air tools.

Recently, the compressor has started tripping the reset switch when reaching about 40 lbs of pressure.

I can reset it and it may run for 15 to 20 more seconds before kicking again. The compressor is on clean power hooked to an individual circuit without an extension cord.

I have checked the capacitor for voltage after operation and it reads zero.

After unplugging wires from capacitor, it checks ok on ohms reading according to the instructions on this site.

I have changed the pressure switch and this did nothing.

I do not hear any leaks and it will hold whatever pressure is in the tank after continually resetting the switch.

The motor is definitely not hot when the reset/thermal overload switch trips.

I have not found a solution to this problem on this site.

Do you think the reset switch could be bad or a bad reed valve?

Any help would be greatly appreciated.

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Nov 11, 2018
by: Doug in s.d.ca.


Thanks for letting us know...

Nov 10, 2018
Reset Switch
by: Jim

Changed the reset switch ($10.00 on EBAY) solved the problem.

Oct 26, 2018
Do you think the reset switch could be bad or a bad reed valve?
by: Doug in s.d.ca.


But first, how's the oil? Clean?
Also, the intake filter - clean?

It's been on this house/shop circuit and working until now?

Can you get a clamp-on ammeter and check the current? Failing that, you might go ahead and replace 42, the overload protector. But that's not really likely to be the trouble if it hasn't tripped quite a few times in the past. (It IS the manual, and not the automatic reset on the motor, that's tripping, right?)

Thanks for a comprehensive report.

Let us know.

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