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981 SOS No power to Rear Wheels


 
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williamp
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PostPosted: Fri Oct 12, 2012 9:58 am    Post subject: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

Dad was Brush hogging a pasture and suddenly lost forward movement. Gear selector moves normally. Had to turn disengagement nut to roll tractor onto trailer. I"m not much of a mechanic and closest shop with tools to work on the SOS is more tnan a hour and a half way. Any ideas on potentail cause and suggested fix? Help is greatly appreciated.
 
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awhtx
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PostPosted: Fri Oct 12, 2012 10:06 am    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

Low fluid level?
Stripped the splines on the input shaft and/or the clutch disc?
 
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Larry NCKS
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PostPosted: Fri Oct 12, 2012 10:17 am    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote


did the PTO quit too? if so, conditions as awhtx outlined. If not, internal transmission failure.
 
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williamp
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PostPosted: Fri Oct 12, 2012 2:23 pm    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

PTO working, Fluid level full, 3 point works, remote hydraulics raise and lower modifified dearborn dozer blade I use to plow snow.
 
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awhtx
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PostPosted: Fri Oct 12, 2012 2:38 pm    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

If the PTO is working the input shaft/clutch splines are not stripped. However, the fact that the 3PH and remote hydraulics work has nothing to do with the transmission. They work off of a completely separate hydraulic system than the transmission. You need to check the fluid level in the transmission itself. There is a square head plug in the side of the transmission to check the fluid.
 
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ZANE
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PostPosted: Fri Oct 12, 2012 4:48 pm    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

I have seen the pump line to the control valve array break and loose all function.

Probably the PTO would quit too though????

Zane
 
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mooger
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PostPosted: Fri Oct 12, 2012 8:35 pm    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

The main hydraulic tube broke in my 671 and, although the tractor wouldn"t move, the PTO shaft still turned when the engine was running.

Without oil pressure because of the broken tube, it was still the typical SOS condition where the PTO shaft always rotates - input shaft geared to front PTO shaft/clutchpak/rear PTO shaft and enough friction in the clutchpak to overcome any resistance by shaft bearings.
 
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Larry NCKS
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PostPosted: Sat Oct 13, 2012 5:07 am    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote


There would be a huge difference of possibilities here if the PTO is just coasting under no load. I'm assuming that this PTO is still driving his bush hog???????
 
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James Trovillion
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PostPosted: Sun Oct 14, 2012 5:09 am    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

The transmission has lever to allow the tractor to be towed, check and see if lever got struck and moved. this would cause tractor to have no power to differential
 
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Sean in PA
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PostPosted: Sun Oct 14, 2012 6:04 am    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

James Trovillion wrote:
(quoted from post at 09:09:07 10/14/12) The transmission has lever to allow the tractor to be towed, check and see if lever got struck and moved. this would cause tractor to have no power to differential


From the original post:

Quote:
Had to turn disengagement nut to roll tractor onto trailer.


I take this to mean that after the problem started that the tractor wouldn't roll until he disengaged the traction disconnect.
 
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Larry NCKS
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PostPosted: Sun Oct 14, 2012 9:02 am    Post subject: Re: 981 SOS No power to Rear Wheels Reply to specific post Reply with quote

James Trovillion wrote:
(quoted from post at 08:09:07 10/14/12) The transmission has lever to allow the tractor to be towed, check and see if lever got struck and moved. this would cause tractor to have no power to differential

x2 what sean said. This bridge already collapsed before you got to it. You fell in the river andgot wet! Laughing
 
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