Question about Coleman Powermate 11 Gallon Air Compressor

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My compressor builds up pressure in the tank but nothing comes out unless the unit is on and then it just trickles out like nothing is in the tank

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Have you drained tank
air tanks fill with moisture and crud if not regularly drained
this takes up room in tank and will eventually clog valves etc
you may have to remove hose conection from tank to clean out crud that has clogged it

Posted on Jan 04, 2011

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My 60 gallon kolbalt was running and stop when it filled now it wont go o ever with the tank drain it spins free it does nothing no sounds either


When you say it does nothing do you mean the motor wont come on or the motor comes on and it wont build pressure? if the motor comes on, there are several possibilities:
1. The unloader valve is stuck open
2. The valves in the head are bad
3. The flywheel is loose
If the motor wont come on, the pressure switch is bad (which holds the unloader valve open)
http://www.mastertoolrepair.com/air-compressor-parts-vt6362-p-60727.html

Oct 10, 2016 | Kobalt 3.7-HP 60-Gallon 155 PSI Electric...

1 Answer

Air compressor slow to build pressure, and noisy.


All large air compressors are very noisy.

How long it takes to come up to pressure depends on the size of the compressor piston(s), how fast they are running and the size of the air tank attached to it. (and if the tank or hoses have leaks)
A 20 gallon tank could easily take 10 minutes to get all the way up to 120 psi. 120 is very high, and probably the limit for the compressor. Depending on what you're using it for, try dropping the setting to say 80-90psi.

Sep 25, 2012 | Air Tools & Compressors

2 Answers

When I start my Job boss air compressor model#cffr350b It builds pressure to set psi and stops. Then after using any air gun for a while the pressure drops and the motor kicks in and struggle and will pop...


Whats happening is the compressor is trying to start with pressure on the head/ compressor. The motor is not strong enough to over come the pressure so the motor tries to run ,may be hum a little and pops the breaker. When you bleed the pressure in the tank down the motor does not have to over come the pressure and starts up as it normally would. Now, your problem is the check valve between the tank and compressor. It needs to be replaced. It is allowing pressure in the tank back to the compressor. Thus the compressor tries to start and can't. Trace the line from the compressor to the tank. You should find the check valve screwed into the tank and the compressor discharge line screwed into the check valve. Remove the compressor discharge line,then remove the check valve. Assemble in reverse . also you can loosen the fitting at the compressor. if it blows air all the time it's the check valve for sure.

Aug 08, 2011 | Porter Cable 4 5 Gallons 150PSI Job Boss...

1 Answer

Motor runs, but no air pressure builds in tank


Three things to check.

1) Check that the tank drain is closed

2) Check that your quick connect fitting at the discharge of your compressor is sealing properly.

3) There is a copper or aluminum line that goes from the head of the compressor to the tank. Check the fittings on each end they occasionally come loose due to vibration.

If all of the above is ok:

Check the head gasket of your compressor. The unit you have is notorious for blowing head gaskets.

Hope that helps,
under_psi

Aug 31, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Air won't come out of tank


does the guage show that it is building pressure? if not then the compressor is not working and its not pressurinsing the tank, if it is storing pressure and the compressor is working check the valve on the connector and that its depressing and releasing the air.

Jun 23, 2010 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

My Bostich CAP60P compressor will build pressure to about 40 pounds (tank pressure), and then keep running but not build more pressure or build it very slowly. No leaks.


sudden loss of capacity like that usually indicates broken or leaking valves in the head, or a blown gasket between inlet and discharge side of the head. if nothing is found there, then look at the piston and or cylinder bore for damage.

Jan 17, 2010 | Stanley Air Tools & Compressors

1 Answer

My hitachi EC12 compressor starts up and fills the two tanks. When I connect my hose, the pressure in one tank drops to zero, then goes back up to about 60 psi, then very slowly builds back up to max...


how do you know one tank drops to zero unless you have a pressure gauge on both tanks sounds unlikely unless you are looking at the gauge on the pressure regulator

Nov 18, 2009 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Compressor runs hot and won't build pressure


THE COPPER LINE IS SUPPOSED TO GET HOT, SCALDING HOT ACTUALLY. THE MOST COMMON REASON FOR COMPRESSORS NOT BUILDING PRESSURE IS CLOGGED AIR FILTER OR THE VALVES IN THE HEAD ARE BROKEN OR NOT OPENING AND CLOSING CORRECTLY. YOU MAY POSSIBLY HAVE A BAD AIR LEAK DOWNSTREAM BUT YOU CAN CLOSE THE DISCHARGE VALVE ON THE TANK TO ELIMINATE THAT PROBLEM. HOPE THIS HELPS OR GET YOU STARTED.

Mar 27, 2009 | Campbell Hausfeld Air Tools & Compressors

1 Answer

Air compressor fills, but slows down as the pressure builds


sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you

Mar 22, 2009 | Campbell Hausfeld Air Tools & Compressors

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