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Does anyone know what I could do to replace my very old 1987 John Deere tuff torq hydrostatic transmission. Everything else on the mower works fine. This tranny lost power and will not move the mower. the filter and fluid have been changed.

Thanks in advance!

Numbers off the tranny?

View attachment bdu.pdf
Maybe this will help or look for a used replacement

Here's a few more items you can check over ...

.........http://www.hydro-gear.com/service-and-repair-manuals/

..........http://www.surpluscenter.com/shop.axd/Search?keywords=transaxles

you can also check on EBay ....

Sundstrand-Sauer
BDU-21L- 200
88-12-14109

$891.50 new
https://sleequipment.com/hydro-gear...K913IHCZvbrxx265QsUj2HIyG0RTLk-uj8aAtFm8P8HAQ

$229.99 used
https://www.ebay.com/p/?iid=112066304484&lpid=82&&&ul_noapp=true&chn=ps

Or you can rebuild it. They still make the unit and parts.

Boobala said:

Here's a few more items you can check over ...

.........http://www.hydro-gear.com/service-and-repair-manuals/

..........http://www.surpluscenter.com/shop.axd/Search?keywords=transaxles

you can also check on EBay ....

Click to expand...

Thanks you so much. I was able to determine the bypass valve was stuck by looking at the manuals. Now that I fixed it, the mower is like new Thanks again!

That is fantastic you got her fixed. Thanks for posting the fix.

WOW !! We actually got a Thank-You from someone ..... will miracles never cease ..???