Question about Campbell Hausfeld 26 - Gallon Air Compressor

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Tank pressure reaches setting but outlet pressure is not releasing air

Used the compressor yesterday and it worked fine. Turned it on this AM and tank pressure reached the setting but no air is being released to the stapler. I do not have any directions to refer to. Thanks

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If you have a air nozzle I would plug that in and see if you can get air out of that if no then you may have to adjust the hose/line pressure or you may have something inside that isn't allowing the air to come out of the tank in that case drain the tank and use either a small rod or peice of wire to poke through the outlet and clear it

Posted on Oct 02, 2008

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Compressor comes on then stops wait a min comes on again and imediatly stops again


If you are using the air supply between when it stops and when it comes on again, then this might be normal. You havent mentioned what model/size compressor you have, but if is only a small 1-4 Gallon tank model, then these dont really hold a lot of air, and if you are using any air tool that uses a lot of air, you will be exhausting the tank supply VERY quickly, so the compressor fires up again to refill the tank.

If the compressor is only staying on for a split second after it fires up again, try plugging the compressor in directly to a wall outlet (ensuring the outlet is properly rated) and avoid using extension cords, which can leave the compressor with little power to overcome the tank pressure to kick over and refill. Compressors are best run directly connected to a main outlet, not via an extension cord.

There may also be a problem with the switching/regulating mechanism for the motor if it is jumping on and off in rapid succession. Check your regulator/tank pressure gauge. Take note of what pressure it kicks back on at, and what pressure it stops at. Many compressors will kick back in when the tank pressure drops to 80 PSI, and may stop when the pressure reaches 100-120 PSI.

I hope that helps!

Feb 13, 2011 | General Air & Gas Compressors

1 Answer

My compressor builds to 125 psi then shuts off like it should then when the pressure is released the compressor wont start back up. Sometimes it will attempt to start and it sounds like the motor is...


When a compressor reaches set pressure, there should be a release of air from discharge hose thru the unloader. This release of air unloads the compressor head pressure. The unloader is usually located within the pressure switch. Easy to check. Follow discharge hose from compressor head to tank. There should be a brass/steel checkvalve at the tank. The checkvalve allows air to enter tank, however not allow air to be released back into discharge hose. If this valve is leaking, air will be released from the unloader constantly. Follow 1/4" tubing from checkvalve to unloader and listen for leaks. Repair as needed. If air is not leaking from checkvalve then check unloader mechanism with-in pressure switch. Parts are available at www.toolpartsdirect.com Good luck

Aug 25, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Single cylinder/oil free 5.5hp 30gal will fill tank when started with tank empty. When tank pressure is bleed off motor attempts to start, humms and kicks breaker.


If the unloader is not working properly the motor cannot overcome the head pressure. Two things to check. Make sure tank check valve is not leaking. Easy test. With pressure in tank, unplug the compressor from outlet and remove discharge hose at tank and listen for leak or spray soapy water. If leaking replace valve or try to clean debris from valve seat. If not leaking then problem is most likely at pressure switch unloader valve. Follow 1/4 inch hose from checkvalve at tank to connection at pressure switch. When pressure switch reaches cutoff pressure the switch opens the contacts and moves small tang against valve stem to release air from discharge hose. Check for proper function and repair as needed. Good luck.

Aug 18, 2010 | Craftsman Air & Gas Compressors

1 Answer

Motor "bogs down" at roughly 120 psi...almost stops


You suspect this unit as being a two stage because of the unusually high cut off pressure. It is a single stage and the motor really has a difficult task and is being pushed to the limits. to reach this pressure. We usually reset the pressure to lower setting ~~ say around 140. Your pump probably has a leaking intank check valve (brass fitting at tank) or leaking valve plate in pump. Simple tests : with pressure in tank unplug compressor from outlet and listens for air leak around pressure switch. As you unplug the running compressor from outlet you should hear air leaking from pressure switch for just a moment as air is let out of airline from pump to tank. If air leaks out till zero pressure then change the valve. If tank holds pressure then valve probably ok. Next test, with no air in tank and air filter removed, plug in compressor and feel intake port for strong suction. If the valve plate is bad, suction will decrease as pressure neers the 120 mark till the point of feeling that air is actually blowing out of intake. With good valve plate there will be strong suction untill unit reaches set pressure. If valve plate is bad also change the cylinder and piston ring. Good luck with your repair.

Jul 28, 2010 | Dewalt 2 Hp 4 GAL Air Compressor

2 Answers

Why does my compreeor switch release the air after reaching the required pressure instead of holding the air at the required pressure??? I've just purchased and fitted a new automatic cut off switch to my...


There are two valves in play here. There is a relief valve that opens when the motor kicks off to release the pressure in the compressor itself. That is normal, and is required so that the motor can restart next time without having to overcome that pressure. The other valve is the problem. It is a reed valve between the compressor and the tank. This valve's job is to prevent the air in the tank from returning to the compressor. Think of it as a ratchet for the air. It is this reed valve that has failed.

May 27, 2010 | Northern Industrial 2 Hp Twin Tank...

1 Answer

Inconsistent pressure


As a first check, There should be 2 gauges and a pressure switch with histeresis.
You need to set the tank pressure switch above the regulated output pressure.
The tank pressure will fluctuate between the upper limit and lower limit set in the compressor switch.
The outlet regulated pressure should be below the lower of the switch settings or you will get a varied outlet pressure.
Try setting the tank pressure lower limit higher on the switch - above the outlet pressure required.
Always stay within the tank maximum rating.

If things are nor working properly, it may be the outlet regulator (make sure it is emptied of condensate daily) or a fault with the compressor switch if the tank pressure drops too low before starting.

If the compressor is on more often than usual, then it may need service or repair to worn parts. This is particularly true for vane compressors.

Aug 21, 2009 | Air & Gas Compressors

1 Answer

Once compressor reaches 125 lbs. pressure, the relief valve opens and releases pressure. the motor then tries to engage but cannot come to full speed because of back pressure I am trying to find and...


Generally, the safety/relief is set to 140 to 160psi. The pressure setting is stamped on the side of the valve. Replace the valve if it will not hold stamped pressure(cost about $6 at Lowes Lumber).The pressure switch is usually set at the factory to 120 - 130 psi. The unloader part of the pressure switch will not release backpressure unless it reaches set cut-off. The 1/4 inch line attached to the pressure switch connects to air discharge tube at the intank checkvalve (brass valve). The safety valve should very rarely release pressure, only when pressure switch malfunctions and allows pressure to reach up to 160psi. The tank will hold over 300psi so dont worry about the 160psi safety. I am not sure about your exact model number or brand, however most small compressors work the same and share similar parts. For manuals to other similar compessors to to www.dewalt.com. Here you will find manuals to dewalt and porter cable compressors. I prefer to use generic replacement parts from www.grainger.com or from Lowes Lumber. These parts will cost less than factory replacement. If you need to replace the pressure switch, use SquareD brand from grainger. Watch fitting sizes and pressure range. Good Luck on your repair.

Apr 03, 2009 | Northern Industrial 2 Hp Twin Tank...

1 Answer

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 & Gas Compressors

3 Answers

Start up problem


The problem that you describe is caused by the in-tank check valve and/ or the unloader at the pressure switch. When the compressor cycles off the pressure switch releases the air that remains in the air line thru a small valve. There is a 1/4 " plastic tube extending from the check valve to the switch. Listen for the release of air as soon as the compressor stops. There is a small metal tab that pushes on the unloader valve that may need to be adjusted. The motor does not have enough power to start pumping if there is air/backpressure in the air line. If these parts are working correctly then check the value of the start capacitor and use meter to measure. The cap should test within 95 % of stated value. Parts are available at www.chpower.com. Enjoy

Dec 12, 2008 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

Air compressor w/5hp motor


Assuming that the motor is factory matched to pump, it should be powerful enough to turn the pump. Most problems with motors are related to pressure switch and/or capacitor. The pressure switch could have burned contacts causing low amps to reach the motor. The capacitor should test at least 90% of rated value printed on capacitor. Some volt meters have capacitor check setting. Also this motor at 5 hp must draw lots of amps. The outlet should be rated at least 20 amps and plug the compressor directly into oulet without an extension cord. \
Secondary problem is the in-tank check valve. The check valve should hold in tank pressure without leaking back to the head of the pump. If check valve leaks, replace it with any brand of same thread size. enjoy

Oct 29, 2008 | Air & Gas Compressors

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