1.28 HYDRAULICS Steering in Operation As the steering wheel is turned, the rotary valve proportionally directs the oil flow from the LS line of the inlet section (PVSP) (36) to the steering selector valve (21) (not shown). The LS line is not fully closed until the rotary valve is fully open. When the steering input is stopped, the rotor passages close, steering input stops and the system returns to the load- sensing mode.
Specification Type OSPF250LS PRV 170-175 bar (2465-2537 psi) Shock valve 225-245 bar (3262-3552 psi) STEERING - RIGHT TURN OPERATION Pressure relief valve (23) If an overpressure condition exists, a pressure relief valve (PRV) will bypass pressure oil from the spring side of the priority valve (42) to the hydraulic tank (1). The upstream oil pressure is greater and moves the spool valve, against the spring, allowing oil to be supplied to the working hydaulics. Specification: Operating pressure 175 bar (254 psi)