Comparing SUDT2 and Deere Hy-Guard in M6800-M7040 hyd shuttle transmission

[sixdogs]

When I changed to trans oil in my M6800 hydraulic shuttle transmission, I figured no big deal to use Deere Hy-Guard. After all, I already had it. Anyway, the difference in performance of the hyd shuttle was noticeable. The shuttle doesn't have the same fast engagement of the SUDT2 but is slightly delayed. Also, it feels like it takes longer for the oil to warm up and the transmission is sluggish with the Hy-Guard until it warms up. The SUDT2 was a faster engagement and crisper response with cold oil.

I think the Hy-Guard is wonderful stuff but that the SUD2, being all or partially synthetic has a leg up for a hydraulic shuttle. it kind of like apples and oranges comparison but I don't think Deere has a syn or semi-syn trans fluid. Anyway, that's what I found.

The M6800 is really the same as an M7040 so I would expect similar results. I have one and will use SUDT2 on the 50 hour change this coming summer. SUDT2 must be great stuff. Just an FYI.

 

[Farmer495]

Good to know. Will likely stick with Kubota oil.

 

[sixdogs]

Good to know. Will likely stick with Kubota oil.

Not sure why but SUD2 absolutely makes a difference. Probably the fact it's synthetic. I would bet another quality brand synthetic would work as well but I don't know of any. Kubota SUD2 is over $100 for a 5 gallon bucket.

 

[ovrszd]

I changed to SUDT2 at 500 hours. I too noticed an improvement.

I'm certainly not going to say it's absolutely worth the cost. But I will say you get improved performance. You personally have to decide if it's worth that cost. Was for me.

 

[sixdogs]

Does anyone else make a synthetic trans fluid? Well, other than Amsoil and just a personal preference but I don't care for it.

 

[RaydaKub]

I changed to SUDT2 this fall. When I turn my head to back up, the whine in my tuning fork (most people think this is called a ROPS) is *WAY* less.

 

[MessickFarmEqu]

This is not atypical. Whatever is in SUDT... it seems to be magic stuff. We buy other branded oils by the tanker load, but still get small quantities of SUDT because we keep seeing performance issues when running other fluids.

 

[ovrszd]

This is not atypical. Whatever is in SUDT... it seems to be magic stuff. We buy other branded oils by the tanker load, but still get small quantities of SUDT because we keep seeing performance issues when running other fluids.

Respecting your opinion, can you elaborate?

My improvements are in cold weather operation. Easier to shift the transmission. Completely stopped power steering whine when first cranked in cold weather.

Being synthetic, I expect to extend change interval.

 

[MessickFarmEqu]

Respecting your opinion, can you elaborate?

My improvements are in cold weather operation. Easier to shift the transmission. Completely stopped power steering whine when first cranked in cold weather.

Being synthetic, I expect to extend change interval.

pretty much exactly what you said. Easier shifting, less whine. Most evident in hydrostatics, RTV in particular can be really fussy with the wrong HST fluids.

 

[dieselbob69]

Why mess around w/other hydraulic oils? Cub Cadet's hydro oil is over $40/gallon,while the Kubota Super UDT2 was about $22/gallon at my dealer.Kubota oil is priced about the same as synthetic motor oils,as if I kept the Cub people on here were recommending Rotella T-6 full synthetic for the transmission oil. You can always check to see if anyone on Ebay sells the Super UDT2 for cheaper(or Amazon)....