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Is the problem in the pump on the front of the crank shaft or is there an electrical relief valve that relieves the hydraulic pressure when you turn the engine off. This is a late model 4020, in good shape well maintained, oil and filters changed routinely. Hydraulicas have NEVER given us problems before. If the tractor sets for several hours, the pressure bleeds down and the starter can turn the engine over and it starts fine. Where do we look. Thanks. John
 

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1963 Ford 851
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Many years ago I was a mechanic at a Ford tractor dealership. A friend of the owner brought in his 4020 with the same problem. It had something to do with the pressure relief valve, but I forget what the final repair involved. We did figure out that if you turned the steering wheel left to right to left vigorously while cranking, the pressure was relieved in the system and the engine would start.
Thanks for the memory,
oldjohnny
 
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