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Garden Tractors Discussion Forum

hydro transmission problem

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6jack

11-09-2012 15:24:48
71.173.167.155



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I recently replaced the Sunstrand HT90 hydro transmission in my Bush Hog tractor with a new old stock unit. The old one took quite an effort to push without opening the bypass valve and would drift slowly on an incline if the engine was shut off. The new one can be pushed with little effort and will roll down hill easily. All the check and relief valves are free and clean. I like to stop the tractor on the ramps when loading to clean under deck and it drifts back down. Any ideas where my problem might be ?
The old parking brake was a pin in slot arrangement and was hard to release when on the ramps. I replaced it with a band brake. It will not keep the tractor from drifting backward. Unit seems to work well otherwise.

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6jack

11-10-2012 15:29:24
71.173.167.155



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 Re: hydro transmission problem in reply to 6jack, 11-09-2012 15:24:48  
Thanks for the information.



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JT

11-09-2012 17:42:45
68.53.181.110



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 Re: hydro transmission problem in reply to 6jack, 11-09-2012 15:24:48  
Roger is correct, a hydro will not hold on an incline for very long before the start bleeding off/bypassing and start moving.



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Roger in Iowa

11-09-2012 15:54:13
166.182.3.221



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 Re: hydro transmission problem in reply to 6jack, 11-09-2012 15:24:48  
Hydros will not hold a vehicle from rolling. There is always a little bleed off and once all is bled, look out!

Need to fix the parking brake!



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