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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: 3167
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: 9977
Loc: Idaho
I would call a dealer and see what they recommend.

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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: 3167
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Original fluid spec has been superseded, and THF (please get a quality product, not some low-priced garbage) is the updated recommendation for shared gear drive/hydraulic systems on M4500.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: 8595
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, 190km VWB 5W30
06 CRV, 5 spd auto AWD, 298km M1 EP 5W30

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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: 3167
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 Online   happy


Registered: 09/30/13
Posts: 9156
Loc: Midwest
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 197k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 170k M1 0w40 Mann HU818X
97 Chevy Blazer 4.3 138k Synpower 5w30 Fram TG3980


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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: 8595
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, 190km VWB 5W30
06 CRV, 5 spd auto AWD, 298km M1 EP 5W30

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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 Online   happy


Registered: 09/30/13
Posts: 9156
Loc: Midwest
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 197k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 170k M1 0w40 Mann HU818X
97 Chevy Blazer 4.3 138k Synpower 5w30 Fram TG3980


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


Registered: 09/30/13
Posts: 9156
Loc: Midwest
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 197k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 170k M1 0w40 Mann HU818X
97 Chevy Blazer 4.3 138k Synpower 5w30 Fram TG3980


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