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-wait, wouldn't you want to use special backhoe fluid for that unit? Ohio earth is harder than regular earth, hence the heat?

If the color is red, it would be MIL 5606 (mineral based hyd. fluid) nothing fancy here, just expensive. When I maintained general avaition aircraft in the late 70's it was $6/gallon. F type ATF is basically the same. Straw colored fluid is going to be 10wt hyd fluid/ EO. If the fluid in not...

What color is the fluid in the vehicle now? My M936 and M925 run HDO-10 hydraulic oil, straw colored. Tractor Supply has it 5 gal. pails.

Good ol' 5606, ( Hyd fluid ,red). Used in most general aviation aircraft. I have found it in 5 ton power steering units. F type ATF is a good substitute.