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I use 15/40 engine oil , my logic on that is the pumps on engines the are lubed off the engines pressurized lube systems get 15/40 soooo.
engine 15/40 diesel oil , front axle 80/90 gl-4 to be safe will not harm yellow metals(gl-5 can be used if formulated not using chlorine) trans all gear 80/90 gl-4 , rear end with hydro pump aw-46 and power steering if has own sump aw-46. so basically if it is gear 80/90 anything hydro aw-46 will get you working as best as I know.
well when you remove the old fuel filter empty it in a clear glass container a look for sediment and water ,hopefully you will not see either, but when you have the filter off open the fuel tank petcock briefly and make sure there is a good stream of fuel flowing out, if not check the filter screen that is hooked to the top of the petcock inside the tank, remove as much fuel as you can before removing though. ( do this where you want to kill weeds) as for the injection pump some have small oil reservoir and some are feed by the engines pressurized oil lube system, this needs to be checked out to see which one you have.
something makes me think that your engine is not making the power that it should, have you gone thru the fuel system and looked for restrictions in fuel flow?
I am asking cause it was not covered by you ,what happens if you use low range 4 th gear, that is what I use to mow with on my 50 hp foton with 5 ft ruff cut mower and my 20 hp dong feng running a 5 ft. finish mower. on semi-flat ground. and I keep my rpm around 1800- 2000
the next time you run into a polarity issue use a meter dc will read correct if wired correctly it will show negative voltage if reversed, so them you know to flip connections that need to be made. digital meters are good for this the old analog with needle movements no so much, I have seen tweaked needles from slamming backwards.
I suppose that with the return line a cooler could be added. normally unless something that is not in the hi-flow volume area does not need them.
have you cleaned the radiator fins? do you have a battery in front of the radiator? are you running anti-freeze or plain water? is there a thermostat in the cooling system? but engine heat is not gonna effect hydro’s normally.
it should not cause a problem it is not hydro operated, it has it’s own clutch so unless it is slipping it should not be making any heat, though it is the same oil if you have a common sump tractor which only has one pump, I thought we determined that?
the oil weight is right, the only thing I can think of is that when the oil heats and thins it starts to bypass to the point that it does not make the pressure that it takes to make things operate, did you put a pressure gauge somewhere? It is kinda pointing to the pump but there might be another cause of either lack of pressure because of not pumping correctly or some kinda bypassing going on.
