HYDRAULICS 1.27 Steering valve (21) The steering system is dynamic and fully load sensing and is supplied with pressure operating oil from the load sensing (LS) output of the inlet section (PVSP) (36) on the main hydraulic control valve (25). The valve contains a PRV (23) and two shock valves (24). Steering in Neutral position When the steering valve is in the neutral position, the spring in the priority valve (42) moves the valve to allow the oil to pass freely, from the load sensing line, through the priority valve (42) and the steering control valve (21) to the hydraulic tank (1). The oil supply from the hydraulic pump (2) is locked.
As back pressure increases at the spool of the priority valve (42), the valve spring is compressed and the spool moves to allow oil to flow to the working hydraulics. STEERING - NEUTRAL POSITION