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Black max air compressor leaking air around pressure switch

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 19 Answers

SOURCE: Air leakage through pressure switch needle

1)Let your unit pump up.
2)Turn it off.
3)Find the supply line from the pump to the tank.
4)Remove the supply line from the pump head.
5a)If you hear air coming from the tank you have a bad check valve.
5b)If you do not hear air coming from the tank, you have a leaky
pressure switch.

Posted on Feb 02, 2009

  • 1383 Answers

SOURCE: Makita MAC2200 runs fine (with new Manifold Switch

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.

Posted on Mar 19, 2009

  • 1383 Answers

SOURCE: Coleman Powermate Model Number BV6548049, pressure switch leak.

Usually, a leak at the pressure switch unloader valve is caused by the checkvalve in the tank. The unloader valve at the pressure switch bleeds out the air from discharge tube after compressor reaches set pressure. This only takes a few seconds. If air continues to leak then air is leaking back into the discharge tube past the tank checkvalve. Follow the air discharge line from the compressor to the brass valve at the tank. The brass valve is the checkvalve that holds the pressure in the tank. There are usually two connections at this valve. One is the unloader tube to the pressure switch. Simple test for leaking checkvalve, with pressure in tank unplug or switch off the compressor and remove the small unloader line at the checkvalve(brass valve) and look/listen for leak. If leaking, remove the checkvalve and examine seat/check for debris keeping the valve slightly open. If it cannot be cleaned, order generic replacement from www.grainger.com. It will cost less than the factory checkvalve. Just pay attention to the thread sizes for easy fit. Good Luck on your repair and email if you have questions.

Posted on Mar 25, 2009

  • 89 Answers

SOURCE: my air compressor (pancake task force) cycles on

EITHER YOUR PRESSURE SWITCH IS BAD OR YOUR TANK IS COMPLETELY FULL OF WATER AND THERE IS LITTLE ROOM FOR AIR. ALWAYS TAKE YOUR SWITCH WITH YOU WHEN PURCHASING A REPLACEMENT.

Posted on Apr 05, 2009

lester482529
  • 226 Answers

SOURCE: air compressor slow to build air pressure.

you might need to checktosee if the filter is blocked or dirty were the air intake is just like a car dirt can build up there.

Posted on May 26, 2009

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1 Answer

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1 Answer

Leaking around Pressure Switch. Ordered & replaced switch but still leaking


Some pressure switches have a valve that reliefs the compressor head pressure when the motor stops and closes the head pressure relief valve when the motor runs.
There is a check valve that keeps air pressure from coming back to the compressor head and the relief valve.
I think the check valve is leaking tank pressure to the relief valve and compressor head.
The check valve is where the pressure switch mounts on to and it mounts threaded on to the compressor tank.
Try replacing the check valve

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I have a, sanborn black max compressor builds up to about 30psi but won't go higher. will hold that when shut off. couldit be a check valve?


If it were the check valve, (safety release valve), you would hear the air escaping from the safety release valve. You have an air leak somewhere. A small leak in the system will keep the compressor from building pressure. If you turn the compressor on and feel around the ends of the tube that leads from the compressor cylinder head to the tank (be careful... it will be HOT) you may feel air escaping from the tube connector at the tank or the connector at the compressor cylinder head. If that is the case, tighten the connectors at the compressor head and the tank. If the connectors still leak, you will need to remove the tube and replace the packings (gaskets) at each end of the tube. Also check all of the hose connectors for leaks, and check the hose for damage that may cause an air leak. If you remove the air hose from the compressor and run the compressor you will be able to tell if your problem is in the hose or hose connectors or the compressor-to-head air tube.

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1 Answer

Porter Cable Pancake compressor builds pressure, but will not shut off when max pressure is achieved. Pressure switch is NOT the culprit.


Most P/C compressors shut off at 150psi. If the pressure switch is bad, the pressure will rise until the safety pops. If the safety is not opening, then most likely the cylinder / piston ring is worn to the point that pressure will not increase past safety range (cylinder could be scratched near top ). If cylinder and piston are ok, then air is leaking somewhere (check all joints with soapy water). Good luck

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Henry@I have a coleman model #C65C600V1B103 air compressor. When te compressor shuts off it blleeds air thru a 1/4 inch line thath's attached to the pressure switch. This continues blleding off...


Hello
Check that the pressure switch is installed correctly,meaning there is a in and out.There should be.
If not try turning the pressure switch around or installing it reverse of what it is now.

Also there should be an adjusment on the switch to stop it from releasing at a certin pressure.I think 150psi is max.Set it below.

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1 Answer

My porter cable pancake PSI 150 keeps running will not shut off


The compressor has a max psi setting of 150.If the pressure is not reaching this or is only stabilizing at a low pressure you have an air leak around a gasket somewhere.If it is reaching 150psi and not shutting off your pressure switch is bad.Replace it.Check your owner's manual for a part number or go to www.factoryauthorizedoutlet.com to find the part.

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1 Answer

How dose the unloader work on a T30 compresser ? T30 compresser has small air leak sound comming from intake ? Is there a flow chart of how ther air is compressed T30 ?


There is no unloader on a 2340N5 compressor. However there is a pressure switch that cuts the motor on an off. Located inside of the pressure switch is an air bleeder. When the pressure switch is opened the motor is shut off. A small lever in the pressure switch pushes down on the bleeder valve which lets the air on the compressor head to be released. This allows the the compressor to start up freely. There should be some air heard bleeding off at the pressure switch. If air continues to bleed off all the time the tank check valve is leaking.

If air is leaking back thru the compressor an air leak sound coming from around the air filter (intake) you have a valve leaking allowing trapped pressure to escape thru the air filter (Intake).

I would search the web for a flow chart. I have not seen one.

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1 Answer

Compressor will not turn off


Most single stage compressors come with a pressure switch set to shut off at 125 - 145 psi. These switches become less efficient over time and will Begin to fail but remain useful. A safety valve (brass plut with pull ring) is installed somewhere on your compressor set to open at aprox. 160psi. If the pressure switch shuts off before the safety valve activates you could probably continue to use the unit. If however you would like to have the unit shut off at 125psi replace the switch any switch that can be installed in the space allowed. The black tubing that you see is the unloader. When the unit reaches set pressure and shuts off, the small valve under the pressure switch will open and release the pressure in the tubing. This allowes the compressor to start with no back-pressure. For max. life of compressor make sure that there are no leaks in system and upplug when not in use.
Pressure switches are sold in pressure ranges from 45psi to 160psi. Some brands are better constructed than others. A squareD switch will give long life being used w/o extension cord. Good Luck

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Leaks air at the pressure switch


start your compressor and let it buid up pressure to turn off. then unplug from power.lossen the fill tube that goes from the pump to the tank. when you loosen it. if it leaks air then your check valve is bad and will have to be replaced.

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