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Craftsman 33gal.150 psi air compressor:Start on M/T tank not when full. Start & builds up; then drops down to cut in pressure & kicks breaker when starting up.What can I do to fix this problem.

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Does the air pressure relief/unloaded hiss after the compressor stops on its own?
The tube between the pump and tank should release the pressure when it stops on satisfied pressure switch.
The pressure switch may have a 1/4" tube on a valve that opens and hisses making the pump ready to start
The tubes connect to the tank check valve, this check valve when bad just drains the tank thru the pressure relief at the switch.

Posted on Jul 12, 2019

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Sounds like you need a higher current circuit. When a motor starts up, there is a higher than normal current draw, usually 2x to 4x the running current. When it starts up against cut in pressure, there is even more resistance and hence more current draw than when starting up against no pressure in the tank. So, your circuit is capable of providing startup current with no presure, but with pressure it is drawing more current and tripping the beaker. Don't just put a higher rated circuit hreaker in unless you want to buern down your house. Get an electrician to measure the starting current of your compressor and wire up a circuit and outlet that will handle that current safely. That said, the advertising for the compressor says it can run on a standard (15 amp) household circuit, so your motor may be drawing excessive current. Either way, an electrician can help you. Another option is to add capacitive start to the compressor, but, again, a good electrician will have the solution.

Posted on Jul 12, 2019

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Posted on Jan 02, 2017

Fred Yearian

  • 5603 Answers

SOURCE: My craftsman air compressor model 919 16737 1.1 hp

Probably the check valve has failed. It apparently is where the pipe goes into the tank from the compressor.

Posted on Aug 24, 2009

macgivor

  • 234 Answers

SOURCE: My 33 gallon air compressor will at start build up

Most likely it is the unloader valve. This is inline with the air filltube from compressor to tank. Somestimes the unloader valve is screwed into the tank and air tube is attached to it. This device takes the pressure out of the tube so the compressor can start without the back pressure from in the tank. Other possibility, the start capacitors of the motor. The capacitors must give a kickstart upon startup or the motor will just hum for a couple seconds and overload the breaker. A tempoary solution is to turn off the power to compressor when it reaches 120psi, then allow the pressure to drop to 40 or less, then turn power on and mostlikey compressor will start with a load of 40psi or less. It is a nuisance but it works until you replace the bad part. Goodluck,Macgivor

Posted on Jan 16, 2010

al_kupchella

Al Kupchella

  • 843 Answers

SOURCE: I have an Ingersoll Rand

When the compressor comes up to pressure and kicks off, you should normally hear a gasp of air escaping. That gasp is the release of pressure from the compressor itself - not the tank, and it is supposed to get released so that the compressor can restart without being preloaded with compressed air. My guess is that the gasp is not happening. It is probably some debris or a gummy mechanism. The mechanism is supposed to be triggered by the same mechanism that shuts off the motor.

Posted on Aug 30, 2010

heatman101

D. Floyd Kolb

  • 43501 Answers

SOURCE: porter cable 3hp air compressor

Hi,
Check to see if the switch will kick in if the pressure is released from the hose going to activate it...if so then the problem is the air being trapped between a check valve and the switch in the hose...
I think that is your problem...
There should be a way for the air pressure to change and represent the tank air pressure accurately....
The different compressors all have different ways of checking the air and then allowing it to release as the the tank pressure decreases..

There is a small hole there somewhere that is clogged with dirt and or oil...find that and clean it and you are in business again...

heatman101

Posted on Jul 27, 2011

Repair Ahjoshe

  • 885 Answers

SOURCE: I have a Craftsman (919.176820) 2HP, 12 gal. compressor. I starts fine the first time, it reaches full pressure and cuts off. When the pressure drops and it tries to start again, the motor lugs and

Your tank check valve is stuck/broke. It's on the tank end of the line from the pump to the tank. It is supposed to close when the pump stops to keep air in the tank and let the system bleed pressure out of the pump so the motor can start when there is pressure in the tank. The part you need is CAC-437-2 and is available through searspartsdirect.com.

Posted on Feb 23, 2012

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2 Answers

Hello I have a 20 gallon kobalt model 033204. I just replase pressure switch but does same thing. When I tur on the compressor jus build 50 psi and shuts off.


This usually occurs when the motors internal thermal / amp breaker opens due to overload or weak breaker. Use an amp gauge to test for too much amp draw. If amp draw is normal, then problem could be the in-tank check valve leaking pressure back to the pump overloading the system, or weak capacitor or weak breaker. Bypass the breaker temporarily if the amp draw is normal to test system. Good luck

Oct 31, 2015 | Psi Air Tools & Compressors

1 Answer

Compressors kicks breaker at 60 psi.


This is usually caused by long extension cord, leaking check valve or weak capacitor. Most likely leaking check valve. Easy to check, run compressor for a couple of minutes and shut off. Listen for air leaking from pressure switch or at the intake filter. If leaking, let out air and remove check valve and look for debris stuck under the valve seat. To find the checkvalve, follow the air discharge tube from the head of the compressor to the tank. You should find a brass or chrome valve threaded into the tank. If check valve is not leaking, suspect weak capacitor or long cord (motor shop will test cap for free). Good luck

Apr 02, 2013 | Craftsman Air Tools & Compressors

1 Answer

Compressors


The pressure regulator on an air compressor is designed to let the pump motor run until the pressure in the tanks reaches their safe level. While you are using the air the pressure drops in the tanks until it reaches the level where the pressure switch turns the motor on again and refills the tanks to their rated level. The pressure where these two things happen is usually with in ten psi above or below the rated levels because few regulators are so precise and are affected by temperature that they turn and off exactly at the rated pressures. If a pressure regulator is damaged or broken it is possible for the tank to either reach unsafe high levels or not turn on when the pressure drops to where it should restart the motor. If you are in doubt, have the regulator checked or replaced as overpressured tanks are very dangerous.

Jun 24, 2012 | Craftsman 150 PSI Air Compressor

1 Answer

I have a Craftsman (919.176820) 2HP, 12 gal. compressor. I starts fine the first time, it reaches full pressure and cuts off. When the pressure drops and it tries to start again, the motor lugs and trips...


Your tank check valve is stuck/broke. It's on the tank end of the line from the pump to the tank. It is supposed to close when the pump stops to keep air in the tank and let the system bleed pressure out of the pump so the motor can start when there is pressure in the tank. The part you need is CAC-437-2 and is available through searspartsdirect.com.

Feb 22, 2012 | Craftsman 33 gal Air Compressor 6 hp...

1 Answer

I have a Clarke 150 ltr compressor and the original pressure switch broke so I replaced it with another one. When I start it, it builds pressure fine upto 150 psi (is this right) and then cuts out. Then...


no, Its sounds like you have a receiver tank check valve bad. This valve is designed to hold pressure in the tank . there should be a line on the side of the check valve that goes to the pressure switch. This allows air trapped from the top of the check valve to the compressor to escape so when the compressor starts it does not have to start against pressure in the system. Loosen the line at the check valve or the pressure switch. if it blows until the unit starts or drains the receiver tank if not powered up replace the receiver tank check valve.

Aug 05, 2011 | Electric Air Tools & Compressors

1 Answer

1 hp 3gal craftsman compressor will only build up to 20lbs pressure in tank. how much compression should single cyl have on compression stroke?


A piston in any engine should be around 100 psi I would guess. A Chevy 350 used to be around 150 psi. An air compressor that only pumps enough air to reach 20psi is obviously too low on compression. Nailers and the like need 80 or more psi. The intake valves may be shot, the unloader might be stuck or piston rings are worn.

Dec 08, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

I have an Ingersoll Rand T30 10 HP compressor that runs OK and will bulid up 150 psi without any problems. But when the pressure drops enough to kick the pressure switch, the motor won't start. just tries...


When the compressor comes up to pressure and kicks off, you should normally hear a gasp of air escaping. That gasp is the release of pressure from the compressor itself - not the tank, and it is supposed to get released so that the compressor can restart without being preloaded with compressed air. My guess is that the gasp is not happening. It is probably some debris or a gummy mechanism. The mechanism is supposed to be triggered by the same mechanism that shuts off the motor.

Aug 30, 2010 | Ingersoll Rand Type 30 Reciprocating Air...

1 Answer

My 33 gallon air compressor will at start build up to 120 psi and shut off, after use and at about 80 psi the motor tries to start but kicks our circuit breaker? Any help would be greatly appreciated!


Most likely it is the unloader valve. This is inline with the air filltube from compressor to tank. Somestimes the unloader valve is screwed into the tank and air tube is attached to it. This device takes the pressure out of the tube so the compressor can start without the back pressure from in the tank. Other possibility, the start capacitors of the motor. The capacitors must give a kickstart upon startup or the motor will just hum for a couple seconds and overload the breaker. A tempoary solution is to turn off the power to compressor when it reaches 120psi, then allow the pressure to drop to 40 or less, then turn power on and mostlikey compressor will start with a load of 40psi or less. It is a nuisance but it works until you replace the bad part. Goodluck,Macgivor

Jan 16, 2010 | Craftsman Air Tools & Compressors

1 Answer

My craftsman air compressor model 919 16737 1.1 hp 17 gal 150 psi won't build up any air pressure. It runs but sounds a little odd.


Probably the check valve has failed. It apparently is where the pipe goes into the tank from the compressor.

Aug 24, 2009 | Craftsman Air Tools & Compressors

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