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Re: Ford 800 Tractor Hydraulics

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05-03-1999 16:43:39

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Question. Will implement settle all the way to the ground when you shut the engine off? If so, you have an internal leak. Possibly a worn control valve, leaking unload valve plug, lift piston seals, etc. A sticking unload valve will make the system dead, not bounce around like yours is. Try draining some of the oil out of the reservoir, remove access cover (one with dipstick), and look inside with a mirror and flashlight while your 3 point is settling down (engine off). By doing this you might be able to see exactly where your leak is. Could also be a lift cylinder safety valve, but these rarely give trouble.

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05-04-1999 05:30:20

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 Re: Re: Ford 800 Tractor Hydraulics in reply to Bern, 05-03-1999 16:43:39  
Thanks. If I remember correctly, the implement settled to the ground when I shut the engine off, but I will check it again. I did replace the lift piston O-ring and backup seal, however I did not measure the piston O.D. or lift cylinder I.D. to check for clearance. The piston fit was fairly snug when I installed into lift cylinder so I don't think fluid is leaking past piston. However, I plan to check for internal leakage as you suggested and then go from there. Thanks again.

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