SkyTrak 8042 Service Manual User Manual
Page 481
Hydraulic System
8.66
Model 8042, 10042, 10054 Legacy
Rev. 10/03
c. Crab Steering
When the steer select switch (1) is in the crab
steer (forward) position (2), the front wheels (3)
will steer in the direction the steering wheel is
turned and the rear wheels (4) will steer in the
same direction.
1. Crab Steering Left Turn (refer to page 8.54)
With the steer select switch (1) in the crab steer (forward)
position (2), one of the steer select valve solenoids is
energized. The power steering control valve is shifted so
that system pressure from the secondary function
manifold is applied through the intake side of the power
steering unit metering section.
A specific amount of hydraulic oil is exhausted from the
metering section and routed back to the power steering
control valve, internal to the power steering unit, where it
is channeled to the left rod end of the front steering
cylinder.
Oil from the right rod end of the front steering cylinder
flows through the steer select valve to the right rod end of
the rear steering cylinder. Oil from the left rod end of the
rear steering cylinder flows through the steer select valve
and back to the power steering control valve, then to the
return filter in the reservoir.
2. Crab Steering Right Turn (refer to page 8.56)
With the steer select switch (1) in the crab steer (forward)
position (2), one of the steer select valve solenoids is
energized. The power steering control valve is shifted so
that system pressure from the secondary function
manifold is applied through the intake side of the power
steering unit metering section.
A specific amount of hydraulic oil is exhausted from the
metering section and routed back to the power steering
control valve, internal to the power steering unit, where it
is channeled through the steer select valve to the left rod
end of the rear steering cylinder.
Oil from the right rod end of the rear steering cylinder
flows through the steer select valve to the right rod end of
the front steering cylinder. Oil from the left rod end of the
front steering cylinder flows to the power steering control
valve, then to the return filter in the reservoir.
MA7030
1
2
3
4
MT3890