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Post by Oatking on Apr 10, 2023 7:12:35 GMT -6
I should pay more attention to this type of service in my trucks and tractors. What type of service length do you service or change oil in truck differentials and transmissions? Also what type of oil do you prefer? 80-90 or 85-140 or synthetic oil?
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Post by meskie on Apr 10, 2023 7:26:46 GMT -6
75-90 is what we run in our diffs.
50 in the transmissions.
As for service interval seems like it gets changed when we replace a seal. We always check it and make sure it still looks clean and new. If it gets discoloured we will change it.
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Post by northernfarmer on Apr 10, 2023 10:56:38 GMT -6
I only run the full synthetic 75W-90 in the truck differentials, they have come from the factory with that fill for years now and that seems to be the recommended viscosity for north america given that we have winter and its supposed to stand up to the load in summer heat as well.
In the manual transmissions of highway trucks, I don't know if any that were able to run GL5 gear oil as that is normally a big no no as the syncro will wear out for the high/low and spliter is what I am told due to the high pressure additives in GL5 that will ruin brass. There are or at least were low grades ( GL4 spec is maybe what it was called and was a non EP oil ) of an 80W-90 that was used at one time but for years now the manual transmissions in trucks specify either the full synthetic 50 transmission oil but for some odd reason the newer transmissions specify 40 ( these are two designations that Mobil uses ). So it was for years this 50 oil was the go to, now they have complicated it as per the Mobil 40 but also be it Mobil or others have still a different designation which is also a transmission specific full synthetic 75W-90, now how confusing is that. Here is the oil that Eaton recommended and Kenworth put into my genuine Eaton reman transmission I bought two years ago and according to the Chevron info it claims its backwards compatible with older manual transmissions as well as the newer manuals and the automated manual transmissions. There are still other oil designations as well that are out there, like I said its gotten way more complicated and its best to consult a dealership shop for example just to be sure if your in doubt.
One thing is for sure it seems, that 500000 mile oil change interval for both differentials and transmissions is crap for the use we give trucks, it does not work as I know various oilfield companies find they have to change the oils every two to three years I believe and put on a fraction of those factory suggested oil change miles between oil changes. So what should a farmer do, that is a good question but those that put on few miles a year could go a number of years before ever needing to change oil. Like Meskie said, stick your finger or screwdriver into the fill plug port and look at what colour it is and if its getting off colour or smelling a little odd, go ahead and change it. I like to have new spare drain plugs on hand for the diffs and will sometimes do a plug swap and see what I have on the magnet and make a decision based on that and what the oil looks like. These oils are very expensive these days so don't want to just pour good oil down the drain but also don't want to compromise equipment by not keeping tabs on what is going on.
Just remember, crack the fill plug loose first on a trucks transmission or diff rather then find its impossible to get out after there is no oil in it !
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