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John Deere 7800 hydraulics

Pulled into the yard on my 7800 and suddenly no brakes, no steering, and no 3pt hydraulics. Gearbox and engine still working. Presume it's the charge pump - or maybe main pump. It has plenty of transmission oil. One contact mentioned a "preload valve". I think that's what he said. Anyone got any ideas of where I start - before I call the dealer! Kiwiiana.

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