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Pressure holding at 30 psi Craftsman 60 Gallon Compressor

I have a similar problem. mine is holding at 30 psi, and there is no air leaking at all. I imagine the compression isnt building up because I can free wheel the fan & crank. I have the cover off, and everything looks okay.

Has anyone had to rebuild the ''pistons''?

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I have rebuilt a compressor before. You need new rings and possibly a new sleeve, but probably just new rings.

Posted on Aug 02, 2009

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1 Answer

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Cbillgreene:

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For many years now, stores are in a race to have more HP and PSI to attract customers. Customer is really the loser because components used to make the units can not handle the higher pressure. Normally small 115v compressors are set to cut out at 125psi and larger two stage units will cut out at 160psi. Small compressor set to 200psi makes for short lived compressor. Could be compared to driving your car at 100mph all day every day. Longest life is attained when unit is being used at about 60 to 75 % of capacity.
To allow your compressor to reach cutout pressure and keep working for a while, lower cutout to 120psi (pressure switch may be adjustable). To restore to 200psi, replace cylinder/ ring.
If your compressor is oil type, suspect leaking reed valves.

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Here are the specs.

http://shoppingcart.msservicecompany.com/msservice_net/product_files/D22629/d22629.pdf

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p.s. its not your typical valve like in a car.

is it a wet compressor, check the oil.

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