856 not feeling too good...

Dan Swanson · Dec 22, 2009

BIL was out moving tree stumps around with a loader and got up against a big one and lost the clutch and pto. Called me, I checked it out. At first there was no clutch, then in a bit the tractor felt like it shifted,(Like pressure came up or the such) then there was clutch for a bit. Tried to see if the pto would work because the grapple had ahold of the stump. PTO wouldn't turn at all. Also as soon as the tractor is started there is a very loud whine/somewhat of a grinding directly below the clutch and brake pedals. Got the tractor to move enough to get away from the stump and backed the tractor up to the yard. Clutch seemed to hold for that long. I messed with the pto while I was moving and - no go. When I shut off the pto lever then the T/A would work. I am thinking it is the pump and clutch pack for the pto to start with. Steering seemed to be O.K. Any other ideas? Thanks, Dan

trulyred · Dec 22, 2009

You stripped out the clutch pressure plate spline. It drives the two hyd pumps and the pto. Your clutch seemed to slip due to the erratic pressure of the mcv pump. Your looking at a complete clutch job and the ipto hollow input shaft.

Owen Aaland · Dec 22, 2009

(quoted from post at 19:55:42 12/22/09) BIL was out moving tree stumps around with a loader and got up against a big one and lost the clutch and pto. Called me, I checked it out. At first there was no clutch, then in a bit the tractor felt like it shifted,(Like pressure came up or the such) then there was clutch for a bit. Tried to see if the pto would work because the grapple had ahold of the stump. PTO wouldn't turn at all. Also as soon as the tractor is started there is a very loud whine/somewhat of a grinding directly below the clutch and brake pedals. Got the tractor to move enough to get away from the stump and backed the tractor up to the yard. Clutch seemed to hold for that long. I messed with the pto while I was moving and - no go. When I shut off the pto lever then the T/A would work. I am thinking it is the pump and clutch pack for the pto to start with. Steering seemed to be O.K. Any other ideas? Thanks, Dan

Did the TA and steering work when you were hearing very loud whine/somewhat of a grinding noise? If not, the splines for the clutch cover hub and the IPTO gear have worn out. The gear slipping in the hub is the noise that you hear. When you lose the drive for the PTO you also lose the hydraulics. The sprague clutch is also worn out in the TA. When you lose the hydraulics you no longer have the use of the high side of the TA and you also lose the hydraulic back up of the low side so you have only the drive through the sprague. When you turn off the PTO you lessened the load enough on the PTO drive train that splines held enough to drive the hydraulics.

Janicholson · Dec 22, 2009

382349R1 might be the part Number, I was looking it up and you got to it first. Jim

mkirsch · Dec 23, 2009

The actual clutch itself is fine.

Your problem is, the tractor needs hydraulic pressure to operate the TA. Without that there is no way power will get from the engine to the rear wheels.

If anything is a weak point on these tractors, that's it. Takes 30 years to get there, but when it does, you're dead in the water...

Unfortunately, the pressure plate is probably damaged from the splines letting go, so you will have to replace it. Since you have to replace the pressure plate, you really should replace the clutch too, and for best results with the new clutch, you should have the flywheel resurfaced.

Dan Swanson · Dec 23, 2009

When I first started it the whining was there immediately, power steering worked. Nothing hooked to the hydraulics to see if they work. loader runs off a pto pump. He had the T/A in the forward position when I got there. We got the tractor away from the stump by help pulling it with a pickup. Once I got clear of the stump I backed it to the yard. The whining noise was there the whole time. At first the T/A didn't shift but after a bit I moved it forward and it hesitated a bit then it worked. Thanks for the info. I appreciate it. Have a Merry Christmas!! Dan

Fred Winkler · Dec 23, 2009

Check the fluid. if it is too low, nothing will work either

Dan Swanson · Dec 23, 2009

I checked that first thing and all was O.K. Thanks. Dan

856 not feeling too good...

Dan Swanson

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trulyred

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Owen Aaland

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Janicholson

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mkirsch

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Dan Swanson

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Fred Winkler

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Dan Swanson

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