Gear Oils

M274 Mechanical Mule Wanted, For Sale (NO AUCTION or EBAY), and Knowledge Base
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Chuck W.
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Gear Oils

Post by Chuck W. » Mon Jun 28, 2021 12:31 pm

I have been looking into gear oil specs and recommendations, specifically for the mule transaxle and drop housings after my friend's recent bearing failure. Here's what I have decided; GL-1 90 wt. in the transmission and GL-5 90 wt. in the drop axle housings. Debating if I should go with a synthetic oil. My friend uses his mule almost daily on his farm and keeps it serviced. Thoughts and opinions welcomed
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Re: Gear Oils

Post by Grummanflyer » Mon Jun 28, 2021 6:15 pm

Are you planning on using GL1 because of the concern over yellow metal damage in the transmission? I have always used Amsoil pure synthetic all over in my mule and have no trouble at all as long as you have good seals. The 80-90 I use is Amsoil Severe Gear and is GL5 rated. There was a heck of an argument over on Steel Soldiers once over using gear oil with sulphur , which was the high pressure additive but I don't know if that argument will pass the sniff test today or not. It comes pretty highly recommended for manual transmissions and differentials and I doubt they would do that if their additive was detrimental to the yellow parts of the gearbox.
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Re: Gear Oils

Post by Chuck W. » Mon Jun 28, 2021 7:45 pm

Yes, the yellow metal issue was the reason for considering the GL1. It would be much easier to run GL5 in everything. I think in a mule, the main concern is the need for a good EP additive, rather than the concern for yellow metal corrosion. Thanks, I will be looking at the Amsoil 80w90.
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Re: Gear Oils

Post by Chuck W. » Wed Jun 30, 2021 8:20 am

After thinking about this, expensive synthetic oil may be overkill, as I like to drain all the drop housings at least once a year and look for metal. Maybe just use a quality GL5 oil.
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Re: Gear Oils

Post by Grummanflyer » Wed Jun 30, 2021 10:09 am

Yes, they are very proud of the stuff. I service my deuce and a half with it also and it costs a fortune to even change the oil in the thing since it takes 6 gallons in just the crankcase. Dropping the oil and checking for metal once a year is probably a good idea. I turned a recess in my deuce transmission plugs and cemented a rare earth magnet into it. Splash oil tells me if it's making metal without having to drain it. No reason why you couldn't do that on a mule too. KJ Magnetics has every size and shape magnet a person could ever need. https://www.kjmagnetics.com/

John
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Re: Gear Oils

Post by Chuck W. » Mon Jul 19, 2021 3:40 pm

I think I may try your idea to install magnets into the drain and fill plugs on the mule. Looking at milling a flat bottom hole in the top of each plug, 3/8" in diameter and 1/8" deep for the magnet to sit into. What did you use to secure the magnets into your plugs? I'm thinking JB weld, maybe?
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Re: Gear Oils

Post by Grummanflyer » Mon Jul 19, 2021 4:57 pm

I used some stuff called Belzona. Its an industrial two part epoxy/metal compound that is really good but dang it is expensive. I'm sure JB weld would be just as good. When JB Weld first came out, I was in an Auto parts store where they had two engine valves stuck together with that stuff. I put it on the floor and stood on the valve stem and actually broke the stem off one of the valves but the joint did not separate.
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Re: Gear Oils

Post by Chuck W. » Mon Jul 19, 2021 6:35 pm

We used Belzona where I worked, but I've been retired 15 years now and have lost all my old contacts, I have to go buy all my supplies now!!
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Re: Gear Oils

Post by Grummanflyer » Tue Jul 20, 2021 1:08 pm

Yup me too. That's the problem retiring from the maintenance business. Now I don't get to test out all those "SAMPLES" anymore. I just looked on ebay and a case of Belzona was $999.00 for 30 packages of 1221 which was what we used.
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