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4020 john deere

larry hoffmann I have a 4020 John Deere that will start only if I shut the valve on the hydraulic pump. Has anyone else had this problem? What is the solution? Thanks It is a diesel.
bill the main hydraulic pump is not "destroking".

when the pump builds pressure, it kicks itself out, causing no drag. have you tried turning the steering wheel back and forth while turning the engine over? that relieves the hydraulic pressure and thus, the additional resistance.
you're dealing with a closed center hydraulic system. it builds pressure and maintains it, as long as the engine is running.(or spinning fast enough). check the starter for bad field coils. load test the batteries. if it's a late model (with a 12 volt system) bench check the alternator. it may have bad diodes which will fry a battery, causing it to turn over slow and will overheat the starter, burning out the field coils.
oh, if it's a power shift, pull back the hand clutch. that was to help during cold weather starting.

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