CAT 769D BED WONT RAISE

Was working then quit has plenty oil. The lever in the cab feels fine so I think the spring in control valve inside hydraulic tank is good.Also the drive shaft mounted to the flywheel that turns this pump is spinning with machine on. Am reading that the hoist pump sucks oil from the hydraulic tank pressurizes it then sends it to the control valve inside tank that sends the pressured oil to the hoist cylinders by lever position inside cab. Anyone no how to check hoist pump pressure? Or seen...

CAT 769D BED WONT RAISE

CAT 769D BED WONT RAISE