SUDT2 versus Universal Hydraulic Fluid

[vulcancowboy]

I can my L3940 is a whole new tractor with SUDT2 in it.

Much quieter HST operation, smoother direction changes, better loader control and best of all it help reduce the sticking third function. Not healed but a thousand times better.

Very worth while investment.

Probably a dumb question, but what is the "sticking third function"?

 

[Onemoreokie]

MX4700. Recently switched to SUDT hoping to quiet the whine. Spent the big money even against the advice of dealer.
No difference at all for me. Cha-Ching, live and learn.

 

[k0ua]

Probably a dumb question, but what is the "sticking third function"?

There have been some problems with the Kubota factory 3rd function valve option.

 

[gwdixon]

I'm among the quality oil fans.

Little HST tractors, like a BX, balk at cheap fluid. I know. Changed out the cheap stuff after only 25 hours on it. That doesn't make it very cheap. Kubota SUDT made everything hum again.

Older gear drive tractors don't seem to care about the quality. The FEL and 3PH of my old L3650 functioned just fine.

Larger new tractors that have a lot of hydraulics involved (hydraulic clutch like on the M-series) really are sensitive, almost like a HST. The hydraulics in the clutch was noisy and stiff with cheap fluid in the M7040. Once again, changed it out after only a few hours.

My L48 TLB hydraulics would shake and shudder when the hydraulics got hot. Changed it out to Amsoil ($$$$$) and haven't had a problem since.

Oh, and to you folks that change the filter and leave in the old hydraulic fluid...good luck.

"It is the cheapest person that ends up paying the most" is a good canard for this situation.

 

[C4Ranch]

MX4700. Recently switched to SUDT hoping to quiet the whine. Spent the big money even against the advice of dealer.
No difference at all for me. Cha-Ching, live and learn.

So you put in sudt and not sudt2? I've read the biggest improvement when using sudt2....

 

[rayclar]

I can confirm that my tractor is much quiter now with super udt2, runs smoother and is worth every penny for the oil.

 

[TripleR]

I've tried a variety of oils over the years and as long as it was good quality, I really couldn't tell any difference. I have not tried SUDT2, so I may put some in when I change the fluid in my 5740. Dealers down here only stock UDT, so I'll have to order it.

 

[ovrszd]

I have heard that SUDT2 makes the HST much quieter, I would switch if that is true. Can anyone confirm?

Though I'm not HST, I noticed no difference in gear noise. Roaded my tractor 10 miles couple days ago right after changing.

 

[ovrszd]

I have SUDT2 in my M8540 paid $89 plus tax per 5 gallons. I experience the same cold cold issues you describe when temps are below ~15ｰF. Pump Whine above 1400 - 1500 rpm when cold. only way to shift easily is to move the shuttle lever to neutral pushing the clutch does not allow for smooth gear changes. Might as well forget range changes for the first 20 minutes the lever freezes in place most of the time. I might try full synthetic AMSOIL tractor hydraulic fluid next time.

Bummer Dave. I was hoping to improve the cold operations a little. Once it gets below freezing my happy butt stays in the heated shop along with the tractor. I've gotten used to starting the tractor, leave trans in neutral, shuttle lever in forward and let it circulate for a few minutes to warm up.

 

[ovrszd]

I've tried a variety of oils over the years and as long as it was good quality, I really couldn't tell any difference. I have not tried SUDT2, so I may put some in when I change the fluid in my 5740. Dealers down here only stock UDT, so I'll have to order it.

I was considering AMSOIL synthetic. Would have only cost a couple dollars a gallon more. Maybe next time.