L3901 Front Axle Oil

DaveFromMi

Well-known member

Equipment
L3901, 5' Bush Hog
Apr 14, 2021
542
450
63
Indiana
I finally remembered to check the oil level. It is ~3/4" below the check plug. Owners Manual states that it should run out of check plug.
Owners Manual states to fill with Super UDT-2 or 80 - 90 wt gear oil. I am assuming it came with Super UDT-2 from the factory, right? It's probably not good to mix the oils.
 

Dieseldonato

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Equipment
B7510 hydro, yanmar ym146, cub cadet 1450, 582,782
Mar 15, 2022
728
437
63
Pa
I have gear oil in my B and my Dads L. I was told by the dealer they came factory with udt/sudt², but they fill them with gear oil when they service them. Pick whatever you'd like and run with it.
 
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WoodKutter

Member

Equipment
L4600 John Deere 750, John Deere 420
Apr 15, 2022
95
54
18
Vermont and Northern Maine
Pick which ever you like, but I wouldn't mix. If you drain it doesn't matter. If your adding I'd go with the factory fill. Most likely udt-2. That's my opinion, worth every penny you paid for it.
 
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mcfarmall

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Equipment
Kubota M5660SUHD, Farmall C
Sep 11, 2013
1,377
1,648
113
Kalamazoo, MI
If it was not ok to mix them, it would be clearly stated as such in the manual.
 
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Fordtech86

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Lifetime Member

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L3200
Aug 7, 2018
4,705
5,476
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Pineville,LA
75-140 in mine, no reason other then the price was right.

don’t think the gears or bearings care much as long as they are wet.
 
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jyoutz

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Equipment
MX6000 HST open station, FEL, 6’ cutter, forks, 8’ rear blade, 7’ cultivator
Jan 14, 2019
2,458
1,565
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Edgewood, New Mexico
I finally remembered to check the oil level. It is ~3/4" below the check plug. Owners Manual states that it should run out of check plug.
Owners Manual states to fill with Super UDT-2 or 80 - 90 wt gear oil. I am assuming it came with Super UDT-2 from the factory, right? It's probably not good to mix the oils.
You are correct. On my new MX, I asked the dealers service manager that question. He said they come with SUDT and if adding, use the same. If draining completely, either SUDT or gear oil are suitable, but don’t mix them.
 
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whitetiger

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Staff member

Equipment
Kubota tech..BX2370, RCK60, B7100HST, RTV900 w plow, Ford 1100 FWA
Nov 20, 2011
2,542
1,059
113
Kansas City, KS
I finally remembered to check the oil level. It is ~3/4" below the check plug. Owners Manual states that it should run out of check plug.
Owners Manual states to fill with Super UDT-2 or 80 - 90 wt gear oil. I am assuming it came with Super UDT-2 from the factory, right? It's probably not good to mix the oils.
The factory fill is SUDT2 from the factory and that is what should be added to top it off. You absolutely do not add 80/90 to the SUDT2.
When you change the oil, you can refill with either one, just do not mix them.
 
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DaveFromMi

Well-known member

Equipment
L3901, 5' Bush Hog
Apr 14, 2021
542
450
63
Indiana
Thanks for all the responses. I will top it off with Super UDT-2 for now. The tractor has about 100 hrs on it.