SYSTEM / Hydraulic System Steering Stop Circuit (When steering cylinder is at stroke end) • When the steering wheel is operated, the oil passage (orifice 4) between the spool and the sleeve of the steering valve is opened in proportion to the steering wheel rotation speed.Pressure in port LS1, LS2, and CF decreases, the priority valve moves rightward. • When the steering cylinder reaches the stroke end, the pressure in LS 2 in the priority valve increases due to pressure oil from the main pump. • When the pressure in LS 2 exceeds the specified level, the relief valve in the priority valve is operated, and the pressure oil acting on LS2 flows from the relief valve to the hydraulic oil tank. • When the relief valve is operated, the pressure oil in LS2 in the priority valve flows to the hydraulic oil tank. Therefore, the pressure difference between LS1 and LS2 occurs due to orifice 2. • Therefore, the spool in the priority valve moves leftward and pressure oil from the main pump flows to the control valve.
T2-2-10
