Craftsman 919.177541 bogs down and stalls

by Jr. Gunn
(Ionia Michigan )

Craftsman 919.177541 air compressor

Craftsman 919.177541 air compressor

Hi, I purchased an older model Craftsman compressor today. 4hp, two cylinder, 220v power.


With good,clean, power to the unit it will run flawlessly up to about 40 psi, where it slows, then stalls.

At this point, I can turn the flywheel by hand easily. If I turn it off, it remains sealed and holds the 40 psi.

Now, if I stick my finger over the intake valve, either one, it will merrily run on up to 110 psi.

So, is this an indication of a bad gasket, or bad valves?

Thank you

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Sep 11, 2015
stall
by: Doug in s.d.ca

Chris:

So, you had this problem and put on a new motor trying to fix?

Even if it's a "new" new motor, it might also be bad, especially if it has been sitting for a long time.

Are the pullies aligned and properly tensioned?

How much current is it drawing a few seconds after it's running (with empty tank).

Will it run w/o bogging with drain open?

Did your 40A circuit change? What gauge wire? What voltage do you have at the compressor end? At the panel?


Sep 10, 2015
Same problem here with similar unit
by: Chris smith

Mine does the same. I rewired the plug, line and cord. Put a new motor on it and disassembled and diagnosed the hard lines and check valve at the top of the tank. It will run to 40psi, start to bog and finally kick the breaker. The motor is rated at 16amps but the ammeter says its spiking to 35 amps while it's bogging. I'm getting ready to buy new. The only thing I can think of is its on a 40 amp breaker with a 20 ft run from the sub panel.

Jun 13, 2015
stops, but not really?
by: Doug in s.d.ca

By intake valve, did you mean intake port, or can you actually get your finger on the valve?

How long a period between when it starts to stall to full stall, and at stall, what if any noise is it making?

Will it restart from stall if you drain some air?

Finally, it would be informative if you can get an ammeter on it and see what's happening with the current as it stalls.

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