Turning left Turning left (2) (2) CL CR Shock valves Suction valves 15 KV2 S3 KV1 17 16 18A CF R L Ps Pressure reducing valve EF T P LS Ts P T 18 7607SE13 В When the steering wheel is turned to the left, the pressure oil from the steering unit fill on the left side chamber of main steering spool (15), and main steering spool (15) moves to the right in the direction. В At the same time of moving of main steering spool (15), LS signal will be blocked. В If LS signal of main steering spool (15) is blocked, it cause to increase pressure of left chamber of priority valve (18A) and then priority valve (18) to be pushed to right side.
Consequently, oil will flow via CF of priority valve to main spool. That oil will push steering cylinder rod out and it will cause wheel loader to be steered to left side. В The rate of movement of main steering spool (15) is concluded as flow rate, which is kept in left chamber from steering unit. Furthermore the rate controls speed of movement for cylinder. В When the cylinder reaches to end position, pressure of oil flowing through main steering spool (15) will get to be increased. If the oil pressure increase up to relief pressure to be set, relief valve will be activated.
It result in decreasing pressure of left chamber of priority valve (18A), and will push priority valve(18) to right side. Then, oil flow to cylinder will be blocked. 5-8