Central Pneumatic 67847 runs for a few seconds then cuts out

by Tom
(Whitehall,Pa)

Central Pneumatic  model #67847 compressor

Central Pneumatic model #67847 compressor

My compressor runs for a few seconds then cuts out put new pressure regulator switch on lf-10h same as the one that was on there still does same thing, have to keep hitting reset button to build up more pressure I have plugged into 20amp circuit with nothing else on that breaker

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Mar 20, 2017
Reset and trips
by: Bill

Thanks, Brian, for your guidance on this.

Mar 18, 2017
67847 trips & resets issues.
by: Brian

Ok I have a 67847 about 3-5 yrs old.
compressor does not like low voltage...
Hence 50ft ext cords.-;) 12awg only.

Mine would stall on roll up if on long ext cord.( Low voltage)
Low voltage = high current more than 14 amps then the overload or thermal protector trips.

First empty all the air from the compressor.

Changed the oil by draining from the sight glass.
Add new oil only to the level just at the middle of sight glass.

Ran compressor with amp clamp meter reads 120v @11.82amps at zero psi.= unloaded

This is important to understand.

The Tank is the load for the compressor.
0psi = unloaded. 125psi= full loaded

The compressor is the load for the motor.

11.82amps=unloaded. 125psi= less than 14amps

A motor pulls whatever amount of current amps it needs to turn at full rpm.

Let's say motor turns at 1750 rpm @60hz 120v.

Tank fills up so 11.82 amps increases but remains below 14amps until pressure switch cuts out at 125psi.

If you have low voltage you will exceed 14amps.
Then trips the protection overload.

If your pressure switch contacts are worn out
Due to on /off work cycle use that to will cause low voltage.

If the piston rings have damaged the walls of the cylinder this will increase load by friction since oil can not lubricate. It will trip the protection.

If you have always used your air compressor and it slow starts or trips of as you start with or without the ext cord. Then it's perhaps time for a new capacitor.

A capacitor makes up for for low voltage upon the motor starting. However constant slow starts indicate low voltage.

Capacitors do have a limited operating life.
I hope this helps. But hey... for $179.00 it's all fun huh?-;)

Peace to you always in your journey of life!

That means that at empty tank start up
Motor turns at 1750 rpm speed @

Mar 04, 2015
Same Issue
by: Josh

I have the same issue with the same compressor. I runs at low RPM before it trips the reset. My guess is a capacitor problem but haven't had a chance to troubleshoot.

Aug 26, 2014
Central Pneumatic cuts out
by: Bill

My first thought would have been the pressure switch too, Tom.

However, when you say "have to keep hitting reset button to build up more pressure" that is suggesting to me that the motor is overheating.

Good that you have the 67847 plugged into a 20 amp breaker.

Tell me as a comment, do you feel that the motor is overheating?

If so, time to check the run capacitor I think. See how on the page on this site.

Bill

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67847 Compressor keeps overloading reset switch

by lou

i have a central pneumatic air compressor #67847. i just brought it used.

when i went to turn it on, it would run for 20 secs then shut off , maybe building up to about 40 psi. i have to hit the reset buton to kick it back up but it wont build pressure past that. itll just run for a few then shut off again.

then i checked the fuild levels an realized they filled it past the full mark, the oil was black which was a bad sign also.

turned it on again an it reached past 90 psi but it popped the reset a couple times during that process, and sometimes when i hit the reset it will hum then pop the reset again.

the pressure switch is broken also because it'll stay on even though the lever is in the off position, what can be the problem

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Mar 03, 2015
What could be the 67847 problem?
by: Bill

Lou, probably a couple of things.

Check the unloader valve to make sure it's working, and do that by seeing the the compressor starts OK with the tank totally empty.

While you may have a pump problem, I'd check the start capacitor next. See that page on this site.

Bill

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Model #67847 just hums then pops the reset

by josh g.
(lockeford ca)

My compressor model # 67847 just hums then pops the reset, no extension cord ether

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Jul 16, 2015
67847 - I can sell mine to you or I need parts
by: Anonymous

I have an air compressor 67847 I need spare parts or I can sell mine to you.

Please let me know.

May 27, 2015
Source for capacitor
by: Bill

If you Google start capacitor suppliers you will find many.

You need to know the size of yours, the voltage rating, the microfarad ratings, and as long as the new one has the same ratings, and as long as it fits the footprint, then it will work.

The rating information should be on the side of the old cap.

May 27, 2015
Parts
by: Gaylon

Where do I get a start capacitor for the 67847?I've looked every where. Thanks

Oct 26, 2014
Troubleshoot
by: Dewayne

Not sure what your compressure looks like, but if you have a guard or cover over the drive, remove it (unplug copmpressor), make sure it spins over and not locked up. If it spins free, it's probably the start capacitor.

Aug 06, 2014
Humming or buzzing air compressor
by: Bill

Hello Josh...

See the troubleshooting pages and find the page that talks about humming or buzzing air compressors.

Follow the checks and add a comment here with more if you wish.

Bill

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