SkyTrak 6036 Service Manual User Manual
Page 132
Section 9.
Hydraulic System
9-19
Model 6036 S/N 9B0499 and Before
3.
The steer select valve solenoid is energized
and shifts the valve spool. Oil is channeled
through ports J to G and to the retract side of
the left rear steering cylinder and the extend
side of the right rear steering cylinder.
4.
Return oil from each of the rear steering
cylinders passes through steer select valve
ports H to I to the retract side of the right
front steering cylinder and extend side of the
left front steering cylinder.
5.
Return oil from each of the front steering
cylinders flows through ports A to E of power
steering control valve section to the return
filter and reservoir.
Left Turn - Crab Steer
When a left turn is being made with the steering
select switch in crab steer (down position):
1.
The power steering control valve spool is
shifted so that supply pressure is applied
through ports F to B, Fig. 9.7, to the intake
side of the power steering metering section.
2.
A measured amount of hydraulic oil is ex-
hausted from the metering section and routed
back to the control valve section where it is
channeled through ports C to D to port J in the
steer select valve.
3.
The steer select valve solenoid is energized
and shifts the valve spool. Oil is channeled
through ports J to H and to the retract side of
the right rear steering cylinder and the
extend side of the left rear steering cylinder.
4.
Return oil from each of the rear steering
cylinders passes through select steer valve
ports G to I to the retract side of the right
front steering cylinder and the extend side of
the left front steering cylinder.
5.
Return oil from each of the front steering
cylinders flows through ports A to E of the
power steering control valve section to the
return filter and reservoir.
Right Turn - 2 Wheel Steer
When a right turn is being made with the steering
select switch in 2 wheel steer (center position):
1.
The power steering control valve spool is
shifted so that supply pressure is applied
through ports F to C, Fig. 9.7, to the intake
side of the power steering metering section.
2.
A measured amount of hydraulic oil is ex-
hausted from the metering section and routed
back to the control valve section where it is
channeled through ports B to A.
3.
Supply oil is routed from port A to the extend
side of the right front steering cylinder and
the retract side of the left front steering
cylinder.
4.
Since both steer select valve solenoids are de-
energized, return hydraulic oil from the front
cylinders circulates through select steer valve
ports I to J and power steering control valve
section ports D to E to the return filter and
reservoir.
Right Turn - 4 Wheel Steer
When a right turn is being made with the steering
select switch in 4 wheel steer (up position):
1.
The power steering control valve spool is
shifted so that supply pressure is applied
through ports F to C, Fig. 9.7, to the intake
side of the power steering metering section.
2.
A measured amount of hydraulic oil is ex-
hausted from the metering section and routed
back to the control valve section where it is
channeled through ports B to A.
3.
Supply oil is routed from port A to the extend
side of the right front steering cylinder and
the retract side of the left front steering
cylinder.
4.
Return oil from each of the front steering
cylinders passes through the solenoid-ener-
gized select steer valve from ports I to H to the
retract side of the right rear steering cylinder
and the extend side of the left rear steering
cylinder.
5.
Return oil from each of the rear steering
cylinders flows through steer select valve ports
G to J and power steering control valve
section ports D to E to the return filter and
reservoir.
Right Turn - Crab Steer
When a right turn is being made with the steering
select switch in crab steer (down position):
1.
The power steering control valve spool is
shifted so that supply pressure is applied
through ports F to C, Fig. 9.7, to the intake
side of the power steering metering section.
2.
A measured amount of hydraulic oil is ex-
hausted from the metering section and routed
back to the control valve where it is channeled
through ports B to A.
3.
Supply oil is routed from port A to the extend
side of the right front steering cylinder and
the retract side of the left front steering
cylinder.