Question about Craftsman Air & Gas Compressors

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After initial start the compressor will not re-start due to head pressure because the tank air is bypassing something and coming out also until tank is empty. Also I cannot find where to get parts.

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Most all compressors have an in-tank valve which is usually made of brass. Just follow the discharge air line from the compressor to the tank. Remove the airline and the unloader hose (1/4inch line that attaches to the pressure switch) from the brass valve. Remove the checkvalve and examine it for debris keeping the checkvalve open. If the valve cannot be cleaned then order one from WWW.grainger.com (about $18 ) instead of sears. The generic replacement part will usually cost less. Determine the thread sizes by measuring or take the valve to the hardware store and ask salesman to determine sizes. Common tank thread is 3/8 or 1/2 npt. If you compessor has a model number that begins with WL, then most likely it was made by champbell hausfeld and parts are at www.chpower.com. but will most likely cost more. Good Luck

Posted on Mar 13, 2009

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My 5 hp campbell hausfeld model hl 7017 pumps up to pressure but when it drops the motor starts but the compressor wont turn the belt just slips until pressure drops off to about 30 psi


Your tank check valve is not closing properly. It's a valve on the tank where the air line from the pump head attaches, It allows air in but not back out of the tank through the pump. When the pressure swtich turns the motor off, valve on the pressure switch lets the air out of the head so the motor can restart without any pressure in the pump head when the pressure in the tank drops. On rare occasion, you can clean the check valve out and it'll work again, more often than not you have to replace it.

Nov 24, 2012 | Campbell Hausfeld Maxus 60 Gallon (Belt...

1 Answer

When the tank is empyt the compessor comes on with no problem and runs until it's full, once pressure gets low the compessor should automaticly come on and refill, that"s when the compessor comes...


Hi mcfadden21...

Check and clean or repair or replace your compressor's unloader valve.
The unloader valve is suppose to discharge the compressed air from the tops of the piston heads to the outside to make it easy for the compressor to start when the pressure in the tank drops to the starting point.
Please take time to rate me thumbs up

Sep 15, 2011 | Air & Gas 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

Comperrsor pumps uoto preassure, but when the preasure drops it tries to start . The motor come on but will not turn compressor until preasure drops to about 20 lb. Then it will start and build up to...


Run the compressor until there is about 75 psi in the tank and turn it off at the pressure switch. Remove the black bleeder line from the pressure switch:
1. If absolutely no air comes out of the line you may have a bad start capacitor on the motor. Have it tested at an electrical or refrigeration shop or just replace it to see if it takes care of your problem.
2. If you get a short blast (five or so seconds) of air then nothing your pressure switch isn't letting the head pressure bleed off after the motor shuts off. This pressure has to be relieved or the motor has to fight the tank pressure when it tries to restart. Reconnect the bleed off line and turn the motor back on. If it starts normally, replace the pressure switch. If it struggles or won't start it is more indicative of a bad start capacitor.
3. If you get constant air flow from the bleed line the problem is with your tank check valve. This causes the same problem as above. Replace the check valve.

May 04, 2011 | Ingersoll Rand 30 Gallon Garage Mate...

1 Answer

T30 model 2475N7.5 Ingersoll Rand will not bleed off head pressure when up to 145psi shuts down but will not start when at 95psi takes out breaker 50amp


If air continously comes from the bottom of the pressure switch (bleeder valve) you have a bad tank check valve. The check valve is located on the receiver tank where the copper line from the compressor head goes to the tank. The brass hex between the copper line and the receiver tank is the check valve. Remove it after making sure all pressure has been bleed off the tank. Then you can inspect it. I recommend replacing it unless there is something obviously stuck in it that can be removed with no damage to the check valve. Another way to see if it is the check vale is to loosen the nut on the copper line at the HP head that goes to the receiver tank. If air continously blows from the copper line the check valve is leaking.

Apr 29, 2011 | Ingersoll Rand - Rand Type - 30...

1 Answer

Compressor runs until overload release valve opens (pressure at 130 psi) and then air escapes until pressure lowers to 100 psi..Then motor begins to restart, but will not , due to 100 psi and kicks breaker...


There is a check valve between the compressor and tank, and there is also an 'unloader valve' which blows the pressure off the compressor so that it starts under little load. I think your check valve is stuck open and the unloader valve is blowing tank pressure off.. and when the compressor tries to start it's starting against the pressure in the tank.

So check/replace/thaw the check valve and you'll be good to go. It's generally at the tank where the line from the compressor head goes into the tank, it'll be between the two somewhere.

lp

Jan 02, 2011 | Senco PC2001 2 HP 4 Gallon Electric Hand...

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

Compressor stops then leaks down to low setting


That little copper line is an unloading line, to bleed compressed air out of the compressor head so that the motor can more easily start the compressor. Pressor switch should be threadded into top of air tank, and the unloading valve is built into the side of the switch. When the tank reaches the high pressure setting the switch disconnects power to the motor and opens the unloading valve at the same time. The unloading valve should be connected to the compressor discharge line through a check valve with an unloading valve port upstream of the check valve. These valves are usually threaded into the top of the air tank as well. Sounds to me like your valve was leaking and someone bypassed it.

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1 Answer

My Sears 1 HP compressor motor starts to slow down to almost zero RPM as pressure approaches 60 psi. Up until recently it produced 100 psi. Compressor rotates freely at shut down (no binding, etc). Is this...


IF IT HAS BELTS THE BELTS COULD HAVE BEEN LOOSE AND SLIPPING.. MOTOR COULD BE GETTING HOT DUE TO TOO SMALL OF CORD OR SMALL GAUGE DROPCORD. INTANK CHECK VALVE COULD BE GETTING CLOGGED NOT ALLOWING AIR TO PASS THRU IT. UNHOOK DISCHARGE LINE FROM HEAD TO THE TANK, THIS WILL ALLOW PUMP TO RUN UNDER NO STRESS AND SEE WHAT HAPPENS.

Apr 03, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

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.

Feb 02, 2009 | Campbell Hausfeld 26 - Gallon Air...

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