Webster Hydraulic Fan Motor

[cmillsap]

(09-22-2013 20:23)davidbrady Wrote:  Chuck,

I should have included the document where the drawing came from. It's out of our Library and it's the 1990 Wanderlodge Wide Body Chassis Parts Catalog, page 118. Item number 34 is a high pressure filter with a wired dash indicator. Item number 37 is the Webster relief valve with an integrated fan solenoid valve - wires are also visible on this part. We don't know what portion of this valve has failed and likely never will. The good news is that both pump drive failures look like they have the same cause and that's excessive a damaging downstream head pressures. It's my hope that Tommy will benefit by not subjecting a third pump to the same environment without first rectifying the root cause.

Trying to fulfill WaGu's mission of "answering every question and on occasion even correctly". No guarantee that this one of those rare occasions...

That makes more sense, David, as there is only the one dump line back to the tank showing in the system. Tommy said the solenoid valve is no longer available. If it is an integral part of the relief valve; I’m wondering if a new relief valve would include the fan speed solenoid valve with it… Again, the relief valve which is probably internally piloted may be working properly and the solenoid valve spool may be blocking the flow.

A schematic or diagram of the internal flow pattern of that relief/solenoid valve would be a big help.

Chuck