5z404b pumps to 40psi normally then bogs down.

by Steve
(Mount Ida, Arkansas)

5z404b pumps to 40psi normally then bogs down until it pops breaker.


If it is not power related. I will test the capacitor after sunrise. Assuming it's not power what would be the best bet for my troubleshooting to begin?

Comments for 5z404b pumps to 40psi normally then bogs down.

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Mar 09, 2018
 40psi
by: Grimmerguru

Classic check valve symptom. Does the unloader leak air until the tank is empty?
Feb 08, 2018
 5z404b is the pump...
by: Doug in s.d.ca.

...so what motor is on it?

And yes, the run cap is likely the problem, assuming the motor is big enough. (5 HP)

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