Question about Craftsman Air Tools & Compressors

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Have a Craftsman Professional 150 PSI 25 Gal 1.8 HP compressor. When this compressor starts to run it seems to run very hard and only runs for a few seconds and then the motor trips off. When I retry to start it again it runs a few seconds longer and after 3 or 4 tries it continues to run. Can you help.

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Sounds like one of the following three possibilities:

Too small of service to the unit... You need 20 amp and #12 wiring.

Too long extension cord with too much voltage drop.

The "unloader" is defective. This is a little valve that MAY be a part of the pressure switch that bleeds cylinder head pressure at shutdown to make starting easier. At shutdown you can usually hear it "exhale".

Posted on Sep 09, 2009

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Just fixed my compressor. It would start ok when the tank was empty but trip the breaker if it tried to start with pressure. Searched and read about weak caps, or problem with check valve or pressure switch leaving pressure in the pump head, etc. Turned out that the black plastic box which holds the 2 start up caps and is attached to the end of the motor with 2 screws had cracked on the bottom. The black box had tilted out enough that the start up caps switch was not engaging. Pushed on the lower part of the box and it started perfectly. Fixed it for the cost of some 2 part epoxy. Maybe not your fail, but definitely worth checking out first.

Posted on Feb 17, 2013

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