SUDT2 - Hydraulic Response Loss

[Garybake]

I have a sensative feel for mechanical responses from 30+ years running engine dynamometers pushing the engine limits and swear SUDT has made my machine spongy. I no longer have the BX24 herky jerky reverse pedal symptom anymore either.:laughing:
I changed all my axle fluids to SUDT2 at my 400 hr. mark because I thought for a c-note for five gallons it was the hydraulic fluid to use. When it poured out like Wesson Vegtable oil I checked the label as it was just supprsingly thin (flashbacks to 5w-30 oil introduction). Thinking I could give it an advantage in MI winter it was worth the cost as well as proposed better heat transfer ability in summer.
Today and yesterday I took out two 35+ year old Blue Spruce stumps cut down in winter while sap level was chain saw compatable. I had replaced the backhoe bucket with a Bro-Tek ripper tooth and had at it. Many of those roots were 4" easy and took a lot of control action to get through. I just noticed less of a response or sharpness to the control levers. Even the stabalizers seemed slugish at 2800 rpm. Also noticed what off idle RPM after starting, I used to get hydralic response to lift the bucket and now get nothing. Seems an extra 200+ RPM was required to get any response.

Has anyone else experienced a difference in hydraulic response with SUDT fluid when switching?
Thanks for any feedback.:thumbsup:
Gary

 

[Garybake]

Just to close this post out it took a day to get all the air out of the system. Possibly the thinner fluid may be harder to eliminate air bubbles. Having changed a fitting that broke on backoe cylinder after changing fluid did not help the matter. It is responding better than ever and even have my BX24 reverse pedal herky jerky stop back. Probably should have let filter sit and absorb more fluid before installation.

 

[olde man]

sorry gary i meant to respond sooner. i did look up the fluid couldn't find any issues, talked to some friends with similar machines and nothing. i'm glad you got her fixed

 

[Garybake]

Thanks olde man, if it was still an issue I would have shouted out but we had rain here in MI and did not get back to it. Thanks for the post.:thumbsup:

 

[TBarD]

I switched to SUDT2 (three 5 gal buckets) last fall and so far have not noticed any difference from what was in there before - probably whatever was stock from the Kubota factory in about 2009. Hydraulic fine control seems fine.

 

[Garybake]

Thanks TBarD, I was skeptical when the fluid was like Wesson cooking oil. Then when it seemed spongy I worked it hot and no difference.