Skytrak 6042 Service Manual User Manual download pdf (Page 288)

100

101

Hydraulic System

8.56

Model 6042 Legacy Origin 7/02

Figure 8-24 Four-Wheel Steering Mode

b. Four-Wheel Steering

When the steer select switch (Fig. 8-24, 1) is in

the four-wheel steer (REAR) 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 opposite direction.

1. Four-Wheel Steering Left Turn (Fig. 8-18)

With the steer select switch (Fig. 8-24, 1) in the four-

wheel steer (REAR) position (2), one of the steer select

valve solenoids is energized. The power steering unit

control valve spool is shifted so that the system pressure

from the secondary function valve is applied to 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 section, 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 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

and back to the power steering control valve, then to the

return filter in the reservoir.

2. Four-Wheel Steering Right Turn (Fig. 8-19)

With the steer select switch (Fig. 8-24, 1) in the four-

wheel steer (REAR) position (2), one of the steer select

valve solenoids is energized. The power steering unit

control valve spool is shifted so that the system pressure

from the secondary function manifold is applied to 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 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 to the right rod end of the

front steering cylinder. Oil from the left rod end of the front

steering cylinder flows back to the power steering control

valve, then to the return filter in the reservoir.

MA7020

MT3880

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