the manual for my 2007 Gehl CTL80 says to use SAE90 GL4 in the final drives. Can't find it anywhere. can't get Gehl to reply to my question about what to use. there is a lot of GL5 oil available. is there any "yellow " metal in the drives that would be harmed by using 85W140 GL5? or are there better recommendations?
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Gear oil for final drives
- Thread starter SDTN
- Start date
Nige
Senior Member
Can you get hold of an SAE50 TO-4 oil.? That is the same viscosity as an SAE90 GL-4/5 and it doesn't care a jot if there is yellow metal in the compartment or not.
JTWAT
Well-Known Member
You may try a lower unit lube for boat motors. It is usually a 90 weight GL4.
That's the only gl4 I could ever find.
I've used 75w-90 for a while, but I think that was too thin. Could see some glitter in the old oil. I use 85w140 now.
Nige
Senior Member
We were contracted to Conoco/Phillips 66 on the last job. Good oil.
GL5 is a newer spec. than GL4 so it will be fine . Do not use a TO4 oil that is not a EP type oil.
Bob
Lots of good info. Read a lot about oil. It is my understanding that GL5 has more EP additives than GL4. These extra additives make it corrosive to “yellow metals” such a bronze, brass. Newer GL5 oils may be buffered to solve the corrosion issue, but I don’t know this as fact.
So I guess my real question, is there any yellow metal in a gehl ctl80 final drive that could be harmed by using GL5 rated oil? Can seem to get Gehl dealer to answer this question.
So I guess my real question, is there any yellow metal in a gehl ctl80 final drive that could be harmed by using GL5 rated oil? Can seem to get Gehl dealer to answer this question.
Hi Bob,
Yes, the oils I have researched that are marked GL4/GL5, indicate that they meet the specifications for both.
Yet some give the “yellow metal” caution and recommend using GL4, if that is what the manufacturer recommends. thanks again for your help.
Yes, the oils I have researched that are marked GL4/GL5, indicate that they meet the specifications for both.
Yet some give the “yellow metal” caution and recommend using GL4, if that is what the manufacturer recommends. thanks again for your help.