Hi! Working on a deere 540b skidder, no hydraulics working, testing at the pump finds 0 charge pressure until about 3/4 throttle, then the gauge will come up to around 150 psi but drops to zero again at idle, I've tested the transmission pump pressure at 175 psi, according to the book the transmission pump charges the main hydraulic pump, either my oil is bypassing somewhere or tranny pump is weak and can't flow enough. Any ideas? Please.
Deere 540B lost hydraulics
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