Hydro Cooler Failure TC-40D

Soundguy · Jul 30, 2006

I'm guessing 'max' is the only temp spec to worry about. Flowing fluid in a hyd system is going to come up from 'nominal' temp pretty quick if work is being done..

Soundguy

PineRidge · Jul 30, 2006

Bob does the manual transmission on your TN-70 have a hydraulic oil cooler?

I didn't see any reference to hydraulic oil temperatures listed in the Class III repair manuals. It may be there but I didn't see it.

Doc_Bob · Jul 30, 2006

PineRidge said:
Bob does the manual transmission on your TN-70 have a hydraulic oil cooler?

I didn't see any reference to hydraulic oil temperatures listed in the Class III repair manuals. It may be there but I didn't see it.

Yes, I have a hydro cooler. I have a manual and a Power Shuttle. It is a cross between and HST + Manual..

The thing took 13 gallons of hydro fluid. And a hydro filter and Power Shuttle filter.
Bob

Doc_Bob · Jul 30, 2006

Soundguy said:
I'm guessing 'max' is the only temp spec to worry about. Flowing fluid in a hyd system is going to come up from 'nominal' temp pretty quick if work is being done..

Soundguy

I ask because the folks in Kubota always discuss SUDT and UDT. SUDT is supposed to be "better" in cold weather.
Bob

jinman · Jul 31, 2006

Doc_Bob said:
I wonder if they could tell me the min and max, if such numbers exist.

Bob, I can tell you that hydraulic fluid starts to decompose around 250º F. That's also hot enough to make seals and o-rings fail. I would sure want to keep it below coolant temperature if possible, but I'd say you would be okay up to 180º, but the best would be below 150º. I don't have a lot of concrete evidence for those last two figures except knowing what temperatures are the normal operating range on airplane hydraulic systems. Types of fluid have a lot to do with it too.

I didn't answer your question, Bob. I just rambled on as usual.

Doc_Bob · Jul 31, 2006

jinman said:
I didn't answer your question, Bob. I just rambled on as usual.

Good answer. Maybe we need a new handle for you, like "RamblingJinman"?

I asked a lot of the questions when someone mentioned an aftermarket oil cooler. Less money and if it allows a temp gauge, then so much the better to monitor fluid temperature that the aftermarket cooler provides.
Bob

daTeacha · Jul 31, 2006

The fluid for the Case versions of your tractors (HyTran Ultra for my DX29) has the temperature range printed on the label. For MS1209 (HyTran Ultra) it's from -30C to +50C, which is around -22F to +125F. Whether that refers to ambient temperature or fluid temperature is not mentioned, but I'm going to guess it's ambient since 125F isn't all that hot and the fluid can easily get hotter than ambient but not colder than ambient. Your home water heater is probably set close to 135F.

If I was looking for an aftermarket oil cooler, I think I'd go bigger than stock since you can't get the fluid too cold to work. No fluid to air oil cooler will lower the temperature below ambient air temperature and I doubt that you'd be out there for long at those temperatures anyways.

dieselsmoke1 · Jul 31, 2006

I like the idea of an HST temp gauge. Mine gets hotter than I like when running a bush hog for several hours. Makes we wonder if the PTO could be hydro motor driven, as tranny temp runs noticably higher when pulling PTO load.

Guess it's probably that the only time I keep the rpm's up for extended periods is when hogging.

No place for a sender, how would one install a tranny heat sensor?

PineRidge · Jul 31, 2006

dieselsmoke1 said:
I like the idea of an HST temp gauge. Mine gets hotter than I like when running a bush hog for several hours. Makes we wonder if the PTO could be hydro motor driven, as tranny temp runs noticably higher when pulling PTO load.

Guess it's probably that the only time I keep the rpm's up for extended periods is when hogging.

No place for a sender, how would one install a tranny heat sensor?

How about a T at the inlet to the hydro cooler. Then if you wanted to get really fancy you could also add one to the outlet as well and know how well the cooler is working. Of course this is all relative to just how hot the hydraulic fluid should be when the tractor is working anyway.

Soundguy · Jul 31, 2006

dieselsmoke1 said:
HST temp gauge. Mine gets hotter than I like when running a bush hog for several hours. Makes we wonder if the PTO could be hydro motor driven, as tranny temp runs noticably higher when pulling PTO load.

Unless you have done some custom work on your tractor.. I don't think the NH tc 40 has anything BUT a mechanical pto. If it were a powertrac or a skid steer.. you would be headed up the right path..

soundguy