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Compressor runs and shuts off when set pressure is reached but won't restart when pressure get low. I tries but will flip a breaker in the house

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You need a new starting capacitor for the electric motor

Posted on Nov 12, 2009

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I have a a old Gibralco compressor when i cut it on it starts fine when it reaches desired pressure it stops and restarts until i kicks the breaker what can i try


i suspect that the start/run capacitor is faulty or the centrifugal switch in the back of the motor is faulty

have an accredited electrician check the motor , capacitor and the pressure control switch
the air leak at the head is a faulty non return valve in the compressor line to the tank
available at good tool shops for around $60.00

Sep 07, 2015 | Air Tools & Compressors

2 Answers

Compressor runs and compress air,but when air setting is depleted compressor will not start to compress more air.If you waite it will start some times do think this might the compressor switch


If it doesn't try to start, then it could be the pressure switch. Another suspect could be the thermal overload on the motor. The motor (or just the overload) might be overheating and shutting the unit off, then allowing it to restart when it cools.

Is there any humming, or does it blow the breaker? When ot shuts off, do you hear a brief hiss of air?

If there is humming or breaker blowing on restart, or no hiss of air at shutoff, the pressure switch unloader valve is probably bad. If the air blows off, and there is no humming, and the compressor doesn't reliably start, it is probably the pressure switch. If pressure drops too low, give the pressure switch a tap with a screwdriver. If it starts then, the pressure switch is your problem.

Jun 02, 2011 | Air Tools & Compressors

3 Answers

Compressor runs to 175psi but trips pressure relief when pressure drops tries to restart motor but motor wont turn blows breaker. changed whole pressure switch have same problem.


The problem is lilkely the check valve between the compressor and the tank -- it is alowing pressure to build from tank to compressor preventing the compressor from turning over. Clean, maybe replace, check valve...

Charlie

Jan 09, 2011 | Craftsman 25 gal Air Compressor 3 12 hp...

1 Answer

I have a roll air compresor its the weelbarrow type gas powerd wen i start it it fills up then it shuts off it will start again wen tanks are empty and the prosses has to be repited over an over


The pilot valve controls the pressure, idles the engine when set pressure is obtained and releases compressed air thru small vent while the engine is idling. If the idle is set too low, the engine may stall. Try increasing idle speed and make sure that when set pressure is reached that air is venting from pilot muffler vent. The pilot valve can be easily tested. With engine off and pressure in tank, flip the pilot valve start lever up then down. When flipped up, the throttle control shuld activate idle and the pull rope should be easy to pull. With lever down, throttle is pulled on engine and compressor is loaded making the rope very difficult to pull. If the engine stalls with air in the tank flip lever up to easily start engine then down to pump. Good holidays

Dec 19, 2010 | CRL 4hp Gas Powered Compressor

2 Answers

Champion VR7F will not restart without hitting reset switch.


Solved this problem. It required a new motor starter (or at least one component from the starter. The main power lead running to the thermal overload relay had oxidized and was conducting current poorly. Each time it would run ( I did this with the motor starter cover off) the lead going to the bottom side of the thermal overload would spark then glow red during the tank fill. I removed the bad section of wire, and installed a new thermal overload in the starter.

Sep 15, 2009 | Air Tools & Compressors

1 Answer

Locks up on restart untill the pressure. is down around 50 lbs.and kicks out the breaker


The pressure bleed valve is not working when the compressor shuts off. It is supposed to drain pressure from the compressor air line to the check valve and pressure regulator switch so that the compressor restarts with low pressure in the output line.

Aug 15, 2009 | Makita MAC700 2 HP Air Compressor "The Hot...

1 Answer

Pressure switch does not shut off unit and the


make sure your plugged directly to an outlet. no extension chords

tighten pop off valve colar
check oil / might be over filled

Jul 14, 2009 | Hitachi EC12 Portable Electric 2hp Air...

2 Answers

Amcoraire / aos241hx / code p8 / unit shut down will not restart


for all error codes. http://www.digelair.net/pdfs/TECHLIT/MITSUBISHI/MrSlim_P-SERIES_Troubleshooting_TIPS.pdf

Jun 30, 2009 | AmcorAire UCHW-H24AF2 Split System Air...

1 Answer

Air compressor flips breaker before it will start?


Air compressors tend to draw more power as they age, however, will not trip breaker unless some malfunction. Here are some simple tests. Unplug compressor and turn the pump by hand, you may have to remove a cover to do this. It should turn freely; any resistance could be failing bearing (would make noise) unloader/check valve leaking allowing back pressure to pump, or failed start capacitor/start winding. Easy test for checkvalve. With pressure in tank loosen discharge hose at tank and check for air leak. Check valve should hold pressure in tank. Replace as needed. Failed capacitor/s will cause high amp draw. Remove from circuit and test. UF reading should be within 95% of printed rating. Finally, most air compressor motors have two windings, start and run. Power to windings is controlled by flyball switch inside rear of motor. This switch has contacts that can stick in start position and cause high amp draw. Examine windings for signs of overheating. Copper windings generally have color of new penny. Very dark brown windings bad news. Gook luck

Jan 06, 2009 | Air Tools & Compressors

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