425 hydraulic problem


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425 hydraulic problem

Mike K I have a JD 425 that runs great until the hydraulic system warms up. Then the mower will barely go up hill forward, won't go uphill in reverse and the steering comes and goes. I have been through the charge pump replaced the charge pump, the forward directional valve (because it was sticking), visually inspected the relief valves in the charge pump. Replaced the filter and fluid, using low viscosity oil, and can not figure out what to go after next. Does anyone have any clue where to go next? Does anyone have a hydraulic schematic of the hydraulic system? Any help would be great!! Thanks.

ross Sounds like you have a high pressure leak in the system. Let the mower sit overnite, then start it up and feel the hydraulic components, cylinders, steering motor, transaxle. Which ever one heats up without being used is the one that has a leak in it.


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