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hydraulic fluid migration problem in my 850

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Bill Boquist

09-25-2004 19:42:26

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I have an 850 in which I can fill the rear end and the hydraulic reservoirs to factory spec, then operate the tractor for a few days, and find that almost all of the fluid is in the rear end. I asked an older friend of mine who has had an 861 since it was almost new, and he said he had the same problem, and showed me a solution he had rigged up on his tractor. Basically, it is a copper line that runs from the level plug on the left side of the differential to a fitting he added to the PTO lever cover. It keeps the fluid levels equal between the two areas. Has any one else heard of or experienced this behavior? If so, is there another fix for it?

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Scott PA

09-26-2004 18:04:05

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Re: hydraulic fluid migration problem in my 850 in reply to Bill Boquist, 09-25-2004 19:42:26

Look in the side cover hole with an attachment safely raised and see if it squirts oil from the lift cylinder valve back to the rear end vent opening in the housing when the hitch corrects to compensate for an internal leak, if it does you can make a deflector plate.

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john_bud

09-25-2004 20:00:50

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Re: hydraulic fluid migration problem in my 850 in reply to Bill Boquist, 09-25-2004 19:42:26

Hi Bill,

How you doin? I still can't get over how nice your 4000 looks! Smok'n!!

Say, it sounds like the PTO shaft seal is bad on your 850. As the PTO spins it is dragging hydo fluid into the rear end.

I would drain both the rear section and the axle of fluid and replace the PTO seals. You might need to do that from the hydraulic cover side, your manual will tell for sure. The only other seal is the pinion gear seal. Less likely as it is pretty high up and can't transfer much fluid.

There is quite a bit of force on the ring and pinion in the rear end when you are using the tractor. Having the fluid diluted from 90W with stuff around ~30W is going to wear them faster. Time to panic? Naw, but I wouldn't blow it off either!

Take care and stay in touch!

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