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#4633718 - 01/13/18 02:38 PM 1970's Kubota tractor SAE 80?
Hatch Offline


Registered: 01/13/18
Posts: 6
Loc: Florida
Hello all,
I am trying to figure out what's the best thing to replace my trans/hydraulic oil with on my 40+ year old kubota. Manual simply states SAE 80 and previous fluid looked like engine oil. I've been scratching my head at tractorbynet and someone mentioned bob so here I am.
There's basically 2 schools of thought - SAE80W-90, or tractor THF. What say you?

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#4633723 - 01/13/18 02:41 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
Ramblejam Offline


Registered: 11/05/13
Posts: 3212
Loc: Kentucky
What model Kubota?

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#4633729 - 01/13/18 02:48 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
Hatch Offline


Registered: 01/13/18
Posts: 6
Loc: Florida
M4500DT
Diesel 6cyl gear driven

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#4633826 - 01/13/18 04:24 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
CT8 Offline


Registered: 10/09/14
Posts: 11230
Loc: Idaho
I would call a dealer and see what they recommend.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#4633863 - 01/13/18 05:25 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
Hatch Offline


Registered: 01/13/18
Posts: 6
Loc: Florida
Dealers don't really deal with 40+ year old tractors

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#4633906 - 01/13/18 06:09 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
Ramblejam Offline


Registered: 11/05/13
Posts: 3212
Loc: Kentucky
Original fluid spec has been superseded, and THF (please get a quality product, not some low-priced garbage) is the updated recommendation for shared gear drive/hydraulic systems on M4500.

Two, five-gallon pails will get it done.

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#4633979 - 01/13/18 07:49 PM Re: 1970's Kubota tractor SAE 80? [Re: Ramblejam]
Hatch Offline


Registered: 01/13/18
Posts: 6
Loc: Florida
So regular old tractor supply THF instead of 80w-90?

It sure is hard to find info on old M4500 tractors, is there a good source you're pulling from?

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#4633980 - 01/13/18 07:50 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
IndyIan Offline


Registered: 09/23/08
Posts: 9113
Loc: Ontario, Canada
Get one of the heavier THF and run it in the hydraulic system. Get some heavy gear oil for the front axle if its separate.
_________________________
07 Focus ZXW, 5spd manual, 210km M1 5W30
18 Outback 2.5 CVT 8km FF

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#4634000 - 01/13/18 08:17 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
Ramblejam Offline


Registered: 11/05/13
Posts: 3212
Loc: Kentucky
Originally Posted By: Hatch
is there a good source you're pulling from?

If you're going to Tractor Supply, I'd get Rotella HD Tractor Fluid ($49.99/5gal).


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#4634064 - 01/13/18 09:47 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
Hatch Offline


Registered: 01/13/18
Posts: 6
Loc: Florida
Awesome! Thanks ramblejam

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#4634434 - 01/14/18 10:05 AM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
dlundblad Offline


Registered: 09/30/13
Posts: 10188
Loc: Indiana
Originally Posted By: Hatch
M4500DT
Diesel 6cyl gear driven


Gear driven, but with a hydraulic system. (3 point hitch, loader, or belly mower)

Would this be 2 different fluids?

Hydrostatics on the other hand would be shared.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4635059 - 01/14/18 07:38 PM Re: 1970's Kubota tractor SAE 80? [Re: dlundblad]
IndyIan Offline


Registered: 09/23/08
Posts: 9113
Loc: Ontario, Canada
Originally Posted By: dlundblad
Originally Posted By: Hatch
M4500DT
Diesel 6cyl gear driven


Gear driven, but with a hydraulic system. (3 point hitch, loader, or belly mower)

Would this be 2 different fluids?

Hydrostatics on the other hand would be shared.

No, they all seem to use the same fluid for the trans and hydraulics, even the gear drive ones.
_________________________
07 Focus ZXW, 5spd manual, 210km M1 5W30
18 Outback 2.5 CVT 8km FF

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#4635060 - 01/14/18 07:38 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
Hatch Offline


Registered: 01/13/18
Posts: 6
Loc: Florida
Not sure what you're asking, but yes this is not hydrostatic, it's gear driven and apparently the transmission is lubricated by the shared hydraulic fluid.

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#4635787 - 01/15/18 01:37 PM Re: 1970's Kubota tractor SAE 80? [Re: IndyIan]
dlundblad Offline


Registered: 09/30/13
Posts: 10188
Loc: Indiana
Originally Posted By: IndyIan
Originally Posted By: dlundblad
Originally Posted By: Hatch
M4500DT
Diesel 6cyl gear driven


Gear driven, but with a hydraulic system. (3 point hitch, loader, or belly mower)

Would this be 2 different fluids?

Hydrostatics on the other hand would be shared.

No, they all seem to use the same fluid for the trans and hydraulics, even the gear drive ones.


I would check with the local dealer to be certain.

I was in there today asking about a used G series snowblower they had on the lot. I normally check out the selection of oil and they had quarts of Kubota 80w90 on the shelf. Granted, this could be for PTO boxes too.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4635791 - 01/15/18 01:38 PM Re: 1970's Kubota tractor SAE 80? [Re: Hatch]
dlundblad Offline


Registered: 09/30/13
Posts: 10188
Loc: Indiana
Originally Posted By: Hatch
Not sure what you're asking, but yes this is not hydrostatic, it's gear driven and apparently the transmission is lubricated by the shared hydraulic fluid.


I would confirm this with your dealer.

"Apparently" doesn't sound reassuring.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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