850 ford

JAL1012 · Oct 16, 2012

Also have trouble with hyd lift I lift bush hog and it bleeds off.and lowers it lifts good when its cold I have a vane pump now but I just purchased a piston and manifold from a 2000 model 4cyl should I try anything before I change out the pump the fluids are full

souNdguy · Oct 16, 2012

just to be clear.

it lifts fine cold.. but won't lift hot?

the 'drifting down' is the 'when it gets hot part..? and not because the 3pt control is falling is it.?

if the friction disc is worn, and lets the 3pt handle fall.. the lift will of course drop.

if it's the war / heat issue..then yeah... pump work time.. or replacement as you are doing.. etc..

however for giggles.. you could pressure test it when hot.

after getting hot, chain upper lift arms to axles, plumb in a 0-3000 psi gauge to the plug in the 3x5 cover under the seat.. or even intot he head of the pump.. and then exercise the lift and see what pressure she makes.. yours likely won't hit relief pressure as it is probably bypassing..

i'd also look into the sump and see if there is excessive leakage from the top side..

JAL1012 · Oct 16, 2012

the control arm is locked down with the slide lock when its cold it will lift good the more you use it the harder it is to lift it gets to the point where you have to get off tractor help lift it then it still will go down

souNdguy · Oct 17, 2012

sounds like time for the tests and observations i mentioned.

850 ford

JAL1012

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souNdguy

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JAL1012

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souNdguy

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