9
-6
DT66-W00
Jan. 2007
DK35/40/45/50SE
SAFETY FIRST
G
EN
ER
A
L
EN
G
IN
E
CL
U
TC
H
TRANSMISSION
H
ST
RE
A
R
A
X
LE
BR
A
KE
FR
O
N
T
A
X
LE
H
YD
RA
U
LI
C
EL
EC
TR
IC
ST
EE
RI
N
G
Operation
When the steering wheel is not moved, the valve plate
(3) keeps its neutral position by the centering spring (4).
In this case, the oil flows to the P port through the mod
-
ulator. Then, it is directly sent to the T port and then
returned to the middle of the suction pipe (oil cooler for
HST).
The steering angle is maintained unless the steering
wheel is turned since the RH and LH lines to the steer
-
ing cylinder are blocked. Therefore, the steering wheel
is not returned to the center position when releasing it
after cornering.
neUTRaL
▶
T46W906A
The steering should be forced to be turned in some oc
-
casions, for example, when the engine does not start
or the hydraulic pump is damaged.
When turning the steering wheel to the right direction,
the RH oil passage of the valve plate is open and the
oil is supplied to the R port and the RH cylinder by the
gerotor. Then, the drained oil by the compressed LH
cylinder is returned to the valve plate and supplied to
the gerotor inlet again through the check valve (1).
Therefore, the steering is possible by the recirculation
of the oil in the steering unit and the steering cylinder
even when the oil is not supplied from the gear pump.
manUaL STeeRInG (RIGHT TURn)
▶
T
P
R
L
T46W907A
STEERING SYSTEM - OPERATING PRINCIPLE
M32_EN_A4.indb 6
2007-02-02 오전 10:44:49
