Webster Hydraulic Fan Motor

[davidbrady]

Tommy,

There is a Webster Relief Valve in your hydraulic circuit. When neither the power steering nor the hydraulic fan is calling for pressure the relief valve redirects fluid back to the reservoir. I'd look closely at this valve. If it's failing to open pressures could build to excessive and damaging levels. Here's a schematic of your system. In the drawing item number 37 is the Webster Relief Valve:



My theory is that the pump worked fine as long as you were moving the steering wheel, when you stopped the pressure built and the shaft failed. When you stopped, the pressure had no where to go most likely due to a faulty Webster relief valve.