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AC Mod B gear oil

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Rich, NJ

08-09-2003 04:19:20

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For some time now, I've been trying to figure out just what is the correct gear oil for my 8N Ford.
I've finally got a handle on it I think. Now I want to change the oil in the AC. This should be easy right? well no! It seems that there are five basic classes(?) of gear oils, GL1 through GL5. The GL1 Being the oldest, basic mineral oil that was originally used in gear boxes and differentials. GL5 is the newest and most up to date. The problem with GL5 is that it contains large amounts of sulphur and phosphorous that will eat up yellow metals like bronze bearings Enter the F-NH 134. Sometime after 90 weight gear oil( GL1) was discarded ,Ford came up with Ford New holland 134 combo Gear Lube and Hyd fluid for it's machines. The problem with the 134 is that it's a lighter oil and it slips past the cyl seals and won't keep your 3 pt hitch up in the air as long as the heavier 80/90 wt oils will. So Whats best for a machine of 1938 vintage with no three pt hitch. Presumably, the GL5 oils will ultimately be destructive on bearings. will the F-NH 134 be OK? Thanks Rich

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08-09-2003 06:57:22

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 Re: AC Mod B gear oil in reply to Rich, NJ, 08-09-2003 04:19:20  
to answer your question, yes, you can use the 134 in the final drives and the transmission if you wish. Most people however are using the newer 80-90 wt gear lube in the final drives. Takes about 2 quarts on each side i believe. You need to take out about a dozen little bolts on the bottom pan of each drop box and remove for cleaning. Refill thru the small pipe plugs. The transmission is common with the hydraullics and pto system. since you have no hydraulics you can use gear lube, but the most common "new" system is to put hydraulic-transmission fluid in it. You can get this at WalMart for $10 for a 10 quart bottle. NOrmally it is a 20wt type hyd oil. There are three 1/2 inch pipe plugs below the trans, differential, and PTO. remove all three. refill thru the 1 inch pipe plug by your left foot (on the trans case). For engine use the same 10w30 oil you put in your truck.

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08-09-2003 17:46:11

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 Re: Re: AC Mod B gear oil in reply to steve, 08-09-2003 06:57:22  

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Rod (NH)

08-09-2003 18:35:42

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 Re: Re: Re: AC Mod B gear oil in reply to CHALMERSABOB, 08-09-2003 17:46:11  
Hi Bob,

Yes, it's true that the operator's manuals for the later Bs (AC-O-B) call for SAE 20W in the final drives. However, the ORIGINAL manual (Form TPL-28G) that came with my '42B calls for SAE 140 gear oil above 32 deg F and SAE 90 below. That's probably why yours had the heavy oil in there. It's interesting to note also that my original manual calls for the same heavy gear oil for the transmission (no hydraulics).

third party image Rod

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08-09-2003 18:28:10

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 Re: Re: Re: AC Mod B gear oil in reply to CHALMERSABOB, 08-09-2003 17:46:11  
Either you or your manual are mistaken. No AC final drives take 20 weight oil. Use gear oil here and in the transmission unless you have hydraulics, then use "tractor lube" in the transmission. This is a combination gear lube, hydraulic, power steering, oil developed to replace different types of oils.

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08-10-2003 06:16:49

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 Re: Re: Re: Re: AC Mod B gear oil in reply to wdTom, 08-09-2003 18:28:10  
Tom, AC manuals (service & operator) both call for s.a.e. 20wt oil in the final drives on the D-15 model. Dale

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08-10-2003 06:48:19

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 Re: Re: Re: Re: Re: AC Mod B gear oil in reply to Dale(MS), 08-10-2003 06:16:49  
I learn something new. Thanks.

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08-09-2003 21:04:16

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 Re: Re: Re: Re: AC Mod B gear oil in reply to wdTom, 08-09-2003 18:28:10  
My AC manual must also be in error then. It calls for 20W in the finals and the transmission. However, Tractor Hydraulic Fluid (THF) is the same as "tractor lube" and is about 20W.

I'd still venture to guess that a non hydraulic tractor would do just fine with 90W.

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Tom M.

08-11-2003 12:49:35

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 Re: Re: Re: Re: Re: AC Mod B gear oil in reply to Tyler(WA), 08-09-2003 21:04:16  
Man, I knew this was confusing! I've been trying to figure out what to use in my D15 since I bought it. So many reservoirs, so many fluids. My Operator/service manual says 20w20 for most, and 80ep for something else (darned if I can remember at the moment). Then people in these forums say other stuff.

So, am I set then to think I can put this multipurpose tractor hydraulic/transmission oil in everywhere, except the engine? (which I easily found 10w30 is right).


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