Vehicle Systems
Hydraulic System Operation
34
Hydraulic Steering system
Hydraulic Schematic
steering system schematic
(1) steering unit (2) hydraulic line (3) hydraulic line (4) hydraulic line (5) hydraulic line (6) power steering cylinder
(7) hydraulic line (8) pump motor (9) hydraulic line (10) hydraulic pump (11) hydraulic tank (12) priority valve
(13) suction filter (14) filter-return (15) hydraulic line (16)hydraulic line
The steering system uses the hydraulic fluid for
operation. The system has priority valve (12) which
sends the fluid to steering unit (1) as needed before
the requirements of mast operation are filled.
The fluid is pulled from a hydraulic tank (11) to a
hydraulic pump (10). Pump supplies a fluid through
a hydraulic hose (15) to a priority valve (12).
When the steering unit (1) is neutral position, pilot
pressure in load sensing line (7) is reduced and the
spool of priority valve is moved to the left. The fluid
flows though hydraulic line (16) to control valve.
During a right turn, pilot pressure is increased in
load sensing line (7) and the spool of priority valve is
moved to the right. The fluid flows through hydraulic
line (9) to the steering unit. From the steering unit
the fluid flows through a hydraulic line (5) for right
turn. The return fluid flows through a hydraulic line
(4) back through steering unit, a hydraulic line (2)
and into the hydraulic tank (11).
