806 hydraulics

wijd

Member
I have a 806. Was planting with it this spring shut it off for the night went to start up next day and had no 3 point and no rear hydraulics. Has been sitting for awhile and getting back to the project now. I replaced the rear 12gpm pump which tested good 25 hrs prior to this happening with a 17gpm pump. Started up tractor and still absolutely no hydraulics. Took out relief valve and found no issues. Then I took rear top link bracket off and started the tractor. Found massive waterfall like stream of oil coming from right side top. Upon further inspection I found the stream coming from someplace up top right above the rock shaft. Seems like it would be something that is feeding the top valves or a plug that blew out? Wondering if anyone has seen a similar problem and what was the fix?
 
(quoted from post at 19:05:23 08/04/15) I have a 806. Was planting with it this spring shut it off for the night went to start up next day and had no 3 point and no rear hydraulics. Has been sitting for awhile and getting back to the project now. I replaced the rear 12gpm pump which tested good 25 hrs prior to this happening with a 17gpm pump. Started up tractor and still absolutely no hydraulics. Took out relief valve and found no issues. Then I took rear top link bracket off and started the tractor. Found massive waterfall like stream of oil coming from right side top. Upon further inspection I found the stream coming from someplace up top right above the rock shaft. Seems like it would be something that is feeding the top valves or a plug that blew out? Wondering if anyone has seen a similar problem and what was the fix?

One rather common problem that causes that symptom is the draft control valve leaking where it mounts to the lift cylinder. Usually find a broken lock washer or in some cases a broken bolt.
 
The first thing I would do is swap the relief valve with another tractor to make sure it is not stuck open. The valve is pilot operated so when you look at them the valve assembly will move quite easily with your finger even on a good valve. There is a smaller valve inside the larger one that controls the amount of pressure required for the valve to open. If the inner spring breaks or there is debris caught in the orifice the valve will open with just a few lbs of hydraulic pressure.
 

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