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Tool Talk Discussion Forum

Why not multi-viscosity gear oil?

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Darren in TN

05-21-2005 11:49:32




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Howdy, all.

I asked about rear tine tillers last week and got loads if great responses. Well, I found a Troy-Bilt Horse with the 8hp Kohler and bought it. It is minty, and everything works. I'm out changing fluids today, and noticed that there's a special note in the manual that says that straight 90w or 140w gear oil must be used and that multi-viscosity gear oil should not be used. Can anyone explain that to me? The manual was printed around 1985. I'm hoping y'all will tell me 85w-140 gear oil will be fine, because I can't find straight single weight!

Thanks,
Darren

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Leland

05-24-2005 03:57:54




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
Darren look at a farm supply store they have straight wt gear oil or shoot JT a message he was a dealer for years and he could awsner this question weather multi weight has ever hurt a troy bilt or not if so he would have seen it .



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Glen in TX

05-21-2005 22:13:50




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
Check with some of the industrial supply places or electric motor places that sell gear boxes and they should carry the gear box oil like you are needing in the quart sizes or ask a Troy Bilt dealer about it.



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Jake

05-21-2005 20:11:57




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
Troy-Bilt issued a bulletin many years ago to not use GL-5 oil in them as it can cause corrosion problem with the brass/bronze gear. They stated worm gear drive needs a GL-3 specially formulated for the worm gear. GL-3 was only available on special order when I checked some years ago. I checked some oil suppliers and was told one had to buy the bach lot of 300 or 500 gallons or what ever it was.
I do not know what their current recommendation may be. Maybe have to contact Troy-Bilt and find out. Troy-Bilt will sell you the special oil too.

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tortmort

05-21-2005 20:09:29




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
I use Royal Purple synthetic gear oil. I believe it is 75-90 wt GL-5. Jegs has it.



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matthies

05-21-2005 20:07:22




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
I'm thinking that the straight oils don't heat/expand alot compared to the multigrades. Saying this, I noticed with the multigrades your tine gearcase will push alot of oil out of the breather fill plug and possibly the seals, from experience. I have heard this also on mfwd front axles on tractors, meaning the hubs that don't actually have a breather other than the seal, and people think they have faulty seals all the time, but their using the wrong oil. Otherwise you'll never wear that tiller out. I have a sister to yours, I think I bought mine in 85 also, customed tilled for close to 10 years wearing out the original tines and replacing them with the hardened ones, and of course belts and reverse wheels. I bought mine direct from Troy with a front bumper and a hiller. Best $1200 I ever spent and paid for itself shortly. Wasn't old enough to drive yet, but bought it anyway. Sorry for the long post. chris

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BobinOH

05-21-2005 18:54:36




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
I got 90wt GL-1 gear oil at our Wal-Mart store. It was their brand but should be OK in the tiller I would think. Have a good day.



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Hermit

05-21-2005 18:36:11




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
You might have to go to an oil distributor to order a 90W GL1 gear oil. You might check into using a SAE 50 non-detergent engine oil. It's pretty much the same thing and easier to get.



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Gene Davis (Ga.)

05-21-2005 14:05:48




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
Worm gear drives need extreme pressure type lubricants. Therefore it should read EP in the label to denote that it contains this additive.



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Big Jim

05-23-2005 00:22:03




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 Re: Why not multi-viscosity gear oil? in reply to Gene Davis (Ga.), 05-21-2005 14:05:48  
Gotta disagree here. It is really not the multi-vis oil that is the problem. It is the EP additive found in most multi-vis oils. Gravelys have brass worm gears and it is universally accepted by Gravely owners that the EP additive will damage the brass gears. Usually the only thing that needs an EP lube is a hypoid gear like found in almost every automotive differential.



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Bob

05-21-2005 12:03:33




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 Re: Why not multi-viscosity gear oil? in reply to Darren in TN, 05-21-2005 11:49:32  
Tillers often have a brass worm gear. Some of the modern GL-5 gear oils are REPUTED to have additives in them than are harmfull to brass over a long period of time.

This would be one reason to look for simple 90-weight GL-1 gear oil.

Worn gears have special lube needs, and that is probably why the mfg specified the oil they did.



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