Michigan 75iii GM Diesel

Hello,

I've just purchased a Clark Michigan 75iii tractor shovel, with a General Motors Diesel 4-53 engine. I was told that it was manufactured in 1964.

Does anyone have an operator's manual available?

I'm trying to change all of the fluids and filters, but am not sure which fluids/filters to use, other than SAE30 or SAE40 in the engine. Transmission fluid type? Hydraulic fluid type? Any guidance/advice would be greatly appreciated!

Thank you!

Michigan 75iii GM Diesel