Here we have to first differentiate between transmissions like Clark (for example) that were designed to use ATF as a fluid, and those that were designed to use a dedicated power train oil. Now the subject of engine oil in transmissions. A lot of people use 15W/40 in hydraulics because it means that you don't need to stock a spearate hydraulic oil in addition to an engine oil. In fact I just looked at our current range of machines (all latest models) and 15W/40 is approved in every case as an option, maybe not the "preferred" option but an option nevertheless, as an oil for the hydraulic system PROVIDED that it is not a system that includes brakes, for example the torque converter & brake cooling tank on a truck. This would take us back to the 80's to what you are referring to. It was (and still is) approved by manufacturers like Caterpillar for many "older" models of machines. I wouldn't recommend using the engine oil to HEF members, or the whole internet community, without the experience to go with it.īut as I said above, if you are in snow type climates (of which I have 0% experience) the lighter oil would be better.Ĭlick to expand.I understand and agree with what you're saying completely.įirst to cover the "easy" topic of using 15W/40 engine oil in hydraulic systems.
Some of my dozer customers even use engine oil in their hydraulics, & have done so for many years. Using the engine oil is just simpler - less types of oils to purchase, & for operators to carry for topping up. Seeing that old 455C tranny only convinces me more.ĭon't get me wrong, using a SAE30 tranny oil I'm sure would give similar results - the benefit is in the viscosity - 30 will cling to the gears better than 10 - goes without saying. I have recommended using engine oil to all my Case crawler customers for many years, cause when a machine is using it & when servicing the transmission suction screen - you don't see anywhere near the same quantity of metal flake as with machines that don't - so the wear is just not happening. He has always used engine oil since, well a few yrs back, I pulled a final drive off this machine - with near 30,000hrs on it - I expected to see stuffed crown & pinion for sure - they were like new! I couldn't believe my eyes & if I hadn't seen it, I would never believe it. When he got machine back from repairs, someone told him about using engine oil & he tried it - cavitation problem gone! Machine ran better - less noise, smoother - more viscosity in oil. Well just before the 4yr warranty was up transmission was rebuilt - hard facing was missing on crownwheel & pinions, 2 sp gears - all parts replaced. I was still on the tools for the Case dealer at the time & lots of time & effort went into 'fixing' the problem, new pumps,hoses, thorough testing of all steel lines etc etc (using case tch oil in those days) - could not stop it. I have a customer who bought a 455C new back in the 80's, he always had cavitation problems when machine was new. But i have seen with my own eyes that it works well - on Case crawler transmissions anyhow. Re using the engine oil - I know it sounds wierd Nige & on paper it should not be good for transmissions.
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