1988 leroi dresser q250dpe

by Dan
(Quakertown PA)

88 leroi dresser q250dpe bogs and stalls 4 cylinder perkins diesel engine when air discharge valve is closed. pressure guage reads 100 psi when this happens. what could do this? help greatly appreciated thanks

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Oct 12, 2017
by: Doug in s.d.ca.

It's not unloading - either the pressure sensor is not telling it to, or the intake is not closing for some reason. If not the sensor, then either the solenoid or wiring is bad, or the valve is sticking.

Good luck.

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