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851 hydraulic question

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09-16-2003 15:43:11

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I am not able to get the 3 point arms to lift.
This model has the pump along the right side of the engine near the rear. The proofmeter cable runs out the back of the pump.

I loosened the plug on top of the pump with the tractor running, fluid comes out but not under much pressure. When I got the tractor a few months ago, I checked the fluid levels and the hydraulic reservoir was way over full. According to a friend, this reservoir takes 8 quarts, which is the level it is now at.

When I grab the lift arms, I feel no resistance what so ever, with tractor running.

Any of you guys got any ideas how this old farm boy can fix this thing??


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09-16-2003 18:25:42

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 Re: 851 hydraulic question in reply to Terry, 09-16-2003 15:43:11  
Sounds like either the pump is "laying down" on you or there's a leak in the hydraulic circuit somewhere. Since you do apparently have some oil flow at the pump (indicating that the pump is primed) I would first remove the round cover from the left side of the center housing (the one with the dipstick & PTO lever in it). Then start the tractor, put the 3-point control lever in the full raise position and look into the upper area of the center housing around the lift cylinder. If you see oil streaming out from the lift cylinder or the surrounding area then you have located a leak in the circuit. Many times I've seen the o-ring on the oil passage blown out between the lift cover and center housing. If it runs out of the cylinder itself the lift cover needs to be removed and resealed. Anytime this is done the linkage should also be adjusted but requires special tools to accomplish. There is also a check valve that could stick and dump off the oil, but in my experience this is a rare occurance. Maybe this will give you a place to start. Hope it helps, good luck!

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