Vehicle Systems
Hydraulic System Operation
35
During a left turn, a pilot pressure is again increased
in load sensing line(7) which moves the spool of
priority valve to the right. A fluid flows through a
hydraulic line(9) to a steering unit. From the steering
unit, the fluid flows through a hydraulic line(4) to a
power steering cylinder(6) to make a left turn. The
return fluid flows through a hydraulic line(5) back to
steering unit, a hydraulic line(2) and into the
hydraulic tank.
A check valve is installed into the port of steering
unit connected to hydraulic line(9) to prevent a fluid
back to priority valve right after a turn is made,
Relief valve in priority valve will open if steering
pressure goes above 8275(+500,-0) kpa or
1200(+70,0) psi.
Steering Cylinder
Steering cylinder (1) gives power assistance through
the use of pressure oil at either end of the cylinder.
The steering cylinder is double ended and the body
of the cylinder is mounted stationary to the steer
axle. The rod assemblies at both ends of the
cylinder which allows the cylinder to move the link
assemblies.
Steering Cylinder
(1) Steering Cylinder
1
