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Old 03-27-2011, 02:46 PM   #1
Morpheus77
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Default Craftsman air compressor not building pressure.

Hello folks. I have a 1.75 HP, 125 psi 7 gallon craftsman air compressor that is not running right. It will not get past 50 psi, and it will not turn off. It gets really hot, and after a few min, it'll start smelling funny. Almost like something is burning. The fan runs fine, I've drained the water out of it. The cylinder head gets really hot, and the oil level is normal. What should I do? Thanks in advance.

T.
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Old 03-27-2011, 03:16 PM   #2
fordbroncodave
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Default Re: Craftsman air compressor not building pressure.

it needs new piston rings or reeds in the pump head. if it doesn't compress air and build it, its leaking back into the pump unless there is a significant exterior leak of the compressor tank or fittings.

if its the oil less design throw it away and get a new one
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Old 03-27-2011, 03:17 PM   #3
YellowLakeWelding
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Default Re: Craftsman air compressor not building pressure.

Bad regulator possibly or bad check valve? Take out the check valve and see if you can move the valve. There's either a bypass in the head valve also or the regulator is just faulty.
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Old 03-27-2011, 03:17 PM   #4
99_xc600
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Default Re: Craftsman air compressor not building pressure.

Sound'e like either the ring's are shot or one of the valves are broken.

If you put you hand over the muffler, can you feel suction or do you feel air coming back out?

If you feel air coming out, chances are one of the valves is broken and is allowing the air to be pushed back out of the intake.
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Old 03-27-2011, 03:19 PM   #5
YellowLakeWelding
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Default Re: Craftsman air compressor not building pressure.

Quote:
Originally Posted by fordbroncodave View Post
if its the oil less design throw it away and get a new one
I agree...

How old is this compressor? Many hours on it? Could very well be the rings like fordbroncodave said.
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Old 03-27-2011, 03:23 PM   #6
mrchuck
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Default Re: Craftsman air compressor not building pressure.

Head Gasket is blown. I had this exact one, only pumped a little, gave it to a friend and he took off the head and made a new gasket out of some material, installed it and it works perfectly for him. This was 3 years ago, and it's still working fine for him.
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Old 03-27-2011, 04:47 PM   #7
Morpheus77
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Default Re: Craftsman air compressor not building pressure.

Wow! Thanks for the quick responses. Looks like I have several things to check out then. Not sure how old the unit is, bought it from my best friend after he upgraded to a bigger one. Next time I talk to him, I'll ask. I went back out and looked for a muffler, I don't see one, sorry. However, it's sucking through the intake pretty good, no air coming out of the intake.

T.
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Old 03-27-2011, 07:17 PM   #8
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Default Re: Craftsman air compressor not building pressure.

when it gets to 50psi, unplug it and listen for any leaks.

i am still willing to bet it needs reeds in the pump head or rings.

i had a cman professional 6.5hp 60 gallon oil less compressor and it needed new piston kits every 2 months (it intentionally self destructed and should have been recalled)
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