Does anyone know what the recommended ISO hydraulic oil is for my old 680B case backhoe? I know its 90w in the shuttle, and I think its 46 in the hydraulics, but I wanted to check. Thanks, in advance.
I have never or heard or seen 90wt oil in a shuttle. ISO 46 (SAE 20wt) is ok to use in both the hydraulics and the shuttle. I prefer ISO32 or 10w-30 because of the below freezing temperatures I sometime have in Illinois.