Question about Senco PC1010 1/2 HP 1 Gallon Mini Air Compressor

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Senco air compressor pumps up..when it reaches full pressure it shuts off and then something under the electronic box opens and discharges all of the air.

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Paul Beyer

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That is the safety relief valve which means it has gone bad or you need to turn back the high pressure setting about 5 t0 10 psi. When this happens again there should be a small pin in the middle of it that has a metal ring through it. When it goes off push on that pin and if the air coming out stops or shuts off then you need to turn back the psi if not the valve needs replaced.

Posted on May 09, 2011

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Senco pc1005 air compressor It builds pressure shuts off but then a valve under the control box bleeds down and then it tries to restart and kicks the reset button
the discharge valve is leaking replace it. good luck finding parts.

Jun 04, 2018 | Senco Air Tools & Compressors

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1 Answer

Compressor shuts off before it has reached pressure
probably mis adjusted cut off valve... not something we recommend doing as it could lead to catastrophic failure

Dec 30, 2013 | Ridgid FactoryReconditioned 12 HP 5Gallon...

1 Answer

I have a SENCO PC1005 compressor with a Condor MDR 21-EA/11 pressure switch. When the tank reaches full Pressure (120psi) and the switch cuts out the small in line valve that comes out of the bottom of...
I would talk to senco, they can probably provide you with a parts diagram or a tech service rep to guide you through the problem. I agree that the problem is probably that valve, but I couldnt tell you what its called.

Jul 17, 2011 | Air Tools & Compressors

1 Answer

Where can I buy a new pressure regulator for my Senco PC1010 Compressor?
Normally these pressure switches are universal... Granger's is a good place to get parts like this.

Oct 29, 2010 | Senco PC1010 1/2 HP 1 Gallon Mini Air...

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My air compressor runs good but wont build pressure
If you have no leaks then the valve that discharges from the compressor cylinder(s) is hanging open. It should shut on the back stroke then open when the compressor completes a compression stroke. They are usuall spring loaded, somtimes not. If the compressior has something that looks like a cylinder head the valvle should be located under it.

Aug 26, 2010 | Air Tools & Compressors

1 Answer

Unloader valve keeps opening and closing during pump operation. does not give a continuous discharge, as when the ball valve is stuck open. seems that when the pump reaches max output pressure that the...
Sounds like the cutoff valve is failing to cut power off to the compressor drive motor, while it activates the unloader.--- I'd consider looking closely at the contacts, or replacing the cutoff.

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2 Answers

My air compressor can pump air in but when it get
when it reaches 120 psi it will cut out usually will cut back in at around 70- 80 psi if it struggles to restart at cut in pressure it may not be bleeding the head pressure om your compressor . this is done by the pressure switch which when shuts off releases a small squirt of air under it . to solve this problem you may need new switch . there is also the non return valve to check

Nov 12, 2009 | Campbell Hausfeld 28 - Gallon Air...

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My Senco PC1010 compressor keeps on running, it doesn't build up adequate pressure. All of the petcocks are closed, there are no air leaks. It holds the air pressure that it attains, but it never seems...
Mine was doing the same thing. The pressure regulator had failed. I just removed it until I get around to getting a replacement.

Jul 04, 2009 | Senco PC1010 1/2 HP 1 Gallon Mini Air...

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Makita MAC2200 runs fine (with new Manifold Switch and repaired power cord) but there is an air leak under the new manifold switch that seems to be a feature of the switch. When set to automatic, the...
I have worked on many makita compressors and have run-across this problem on a few of them. Your compressor has a check valve that is supposed to hold tank pressure after the switch reaches set pressure. There is an unloader valve built into the pressure switch that releases the pressure in the discharge hose after the unit shuts off. The unloader allows the compressor to restart with-out any pressure in the discharge line. If the brass check valve is leaking pressure back into the system, air will leak out of the unloader valve. Follow the discharge line to the tank and you will see the brass check valve. To test valve for fault, run the compressor till it builds around 80 psi and unplug the unit from the wall outlet. Remove the 1/4" hose connector from the check valve and check for air leaking out of the valve. If it is leaking you can order form www.toolpartsdirect.com. or call the makita 1-800 number. The price is about the same. Good Luck on your repair.

Mar 18, 2009 | Makita Air Tools & Compressors

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