[Lue]

How does the Sunstrand 90/92 Hydro unit compare to the TuffTorq 71 and up? Reliable?
Tuff torq seems to still support their hydros with parts and service, is the same true for the Sunstrand hydro's?

 

[Diesel332]

Sundstrands are very common, so parts aren't particularly neccesary. When they are, they're usually available from the OEM.

 

[TUDOR]

How does the Sunstrand 90/92 Hydro unit compare to the TuffTorq 71 and up? Reliable?
Tuff torq seems to still support their hydros with parts and service, is the same true for the Sunstrand hydro's?

If you are referring to the Sundstrand Series 15 hydros used in several JD, as well as other brands of GTs, you have to go upscale from the TT K71 to find the equivalent. Mine has only given me one minor problem in 2500 hours that wasn't my own doing from tinkering with it on the bench.

Used replacements can often be found on ebay, and Sauer-Danfoss (the parent company) still supports them.

Sundstrand Series 90 hydros are used in 100+ hp farm tractors.

 

[Lue]

So the Sunstrand model 90 listed on the spreadsheet for JD models 316,318,330322,332,420,430, are capable of handling 100 H.P.? Wow ! sounds like these would last forever on a 20 H.P. garden tractor. Anybody out there ever have one of these Sunstrand model 90's to fail?

 

[TUDOR]

Check the specs. There is a difference between the Series number and the model number. If you go looking for a "90" manual for fixing your GT hydro, it won't help you very much. The tractors in your list all use a Series 15 'U'. The JD 400 uses a Series 15 Inline.

Sundstrand Series 15/70 Technical Information

Note: Series 70 = BDU Series

http://www.sauer-danfoss.com/stellen.../bln-10006.pdf


Sundstrand Series 90 Service Manual

http://www.sauer-danfoss.com/stellent/groups/publications/documents/product_literature/520l0818.pdf