sears craftsman 60 gal. 6.5 hp compressor won't build pressure past 30 psi

I have a sears craftsman 60 gal. 6.5 hp compressor 130 psi max. It had been working great, then when it was running it made a different sound and will not build pressure above 30 psi


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Bill says...

It's making a different sound? What's different about the sound... the motor sounds different or the pump sounds different.

If the motor seems to be running normally, then with the scant info provided, I'm going to guess that you've got a valve problem or a gasket failure, both of which are in the pump.

Cheers,

Bill

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model 919165250 overheats wont go over 30 psi

craftman 919165250 overheats wont go over 30 psi, whats wrong
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See the troubleshooting section on the site map page. Follow the link to the page about why air compressors will not build pressure for some tips.

B.

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Feb 21, 2014
Compressor will only build to 40psi
by: Anonymous

Head gasket blowing out in the center seems to be a common problem., new gasket fixed my compressor.

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craftsman 33 gallon builds pressure, stops, and the pops breakers when refilling.

by Jose R.
(Fresno, CA)

I have a craftsman 33 gallon 150 psi max horizontal compressor purchased about 8 years ago. I bought it and never used it. It was moved from the garage to the back patio, covered patio, but still never used.

Well now I have plugged it up and it works fine.... or so I thought. In one garage, it would start and build pressure, about 80 psi. It would then shut off. When I used it, it would try to start up again but it would trip the breaker. When plugged into a different socket, it would start up again fine but cut off at 80 psi. I have moved twice and every time it would build to 80 and stop. I didn't care cause I mainly used it to air up sports equipment and car and truck tires. I have added air tools to my new toolbox. My impact gun is rated at like 75 ft/lbs and I can use it for a few seconds before the tank needs to refil but it shuts off and then will pop the breaker. I don't know why I can't get it to go into the 100s. Would like for it to refill a few times so I can at least work on my car for a bit. Also once I open the regulator, there is a hiss and my air pressure of course gets lost. So I fill it, use it for a min or two, it will try to refil and then shuts off and will pop the breaker. I have to reset the breaker, unplug it, turn it to the off position, plug it back in, repeat it a few times to remove and install a power steering pump pulley. I just got a 1/2" impact rated at about 220 ft/lbs at 90 psi but my compressor will not get there without a little push. What should I do?!?

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Bill says...

Jose, from the sounds of it, your air compressor may have a couple of problems.

If you have read the information page on pressure switches, you know how they work. If the cut out pressure is 140 PSI for example, the compressor should run until the tank pressure is 140 PSI, and then the switch should trip to off.

If your pressure switch is tripping off at 80 PSI, then I suspect your pressure switch has a problem.

As to the restart issue, please check the unloader valve to be sure it is operating properly. Let me know, will you?

Cheers,

Bill

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6hp 120v 33 gall craftsman - 120v compressor tripping the circuit breaker

by keni thomas
(nashville, tn)

Good Morning Bill.

I have a 6hp 120v 33 gall craftsman. It was running fine earlier this week. but now keeps tripping the circuit breaker at start up.

Having read a previous post i did as you suggested and drained the air out of the tank using the pull pin at the Pressure switch. The compressor then started right up as if it were new.

Can you explain to me why draining the air seems to "fix" the problem and what can i do to prevent it from tripping the circuit breaker again? thanks so much for helping. God bless

Keni

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Bill says....

Keni... pop on over to the site map page, and scroll down to the link for the UNLOADER VALVE. A read of this info will tell you what it is, what it does, and how, when it doesn't work, air compressors sometimes pop breakers on start up.

By draining the tank you have emulated the function of the unloader valve.

Cheers,

Bill

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