Question about hydrostatic transmission
 

So I've spent the last few weeks getting accustomed to my 147. I have noticed that if I set the hydro to a certain speed on level ground, it will slow down a bit going uphill, and speed up some going downhill. At real slow ground speeds (less than 1mph) it may actually stop when going up a grade and I need to push forward on the lever.

Is this normal or a sign of a worn-out transmission?

I rode my buddy's 1986 Wheel Horse 520-h and it maintains a constant speed regardless of whether you are going uphill, downhill, etc, but I know that uses a different brand of hydro unit as well. This is what me question the operation of my 147.

Thanks

A hydro on a Cub isn't like a cruse controll, it is more like a hydraulic cillinder.

If you try to pick up more weight with a hydraulic cillinder you need to push the lever a little further. Same with a Hydro Cub, pulling more weight or going uphill requires more power.

If you are on flat ground and your speed changes by itself, then you need to look here

http://www.onlycubcadets.net/forum/showthread.php?t=43

http://cubfaq.com/hydrolurch.html

http://cubfaq.com/trunionrepair.html

hydro slip
 

Sam is totally correct
Yes I'm sure there is wear in the hydro, everything wears, but it is normal to have to add a little throttle going up hill and it will coast a little faster going down hill.
That is just how that style of hydro works.
it is inherant to a axial piston pump/motor If you would like to learn more, go here:
http://www.cushmantrackster.com/pay-pdfs/sundstrand.pdf
it is an old service manual with some really good explainations/pictures of how it works.

Thanks for the input, guys! I appreciate it! :beerchug: