Operation - wsm L3301 Workshop Manual

L3301, L3901, L4701, WSM

(2) OPERATION

Neutral Position
While the steering wheel is not moved, the torsion
bar (2) is not twisted. There is no gap between the input
shaft (1) and sleeve (3). This makes no pressure
difference between the chambers "a" and "b" of the
cylinder, which keeps the ball nut (4) and sector shaft (6)
in their positions.
(1) Input Shaft
(2) Torsion Bar
(3) Sleeve
(4) Ball Nut
(5) Main Shaft
(6) Sector Shaft
(7) Gear Box
Left Turn
When the steering wheel is turned left, the initial
friction between the tires and the road surface keeps the
ball nut (4) and sector shaft (6) in their positions. The
torsion bar (2) alone is twisted to produce a gap between
the input shaft (1) and sleeve (3) and to activate the
valve. By so doing, the cylinder's chamber "a" comes
under high pressure and the ball nut (4) is moved to the
right. Finally the sector shaft (6) gets turned to turn the
machine to the left.
(1) Input Shaft
(2) Torsion Bar
(3) Sleeve
(4) Ball Nut
Right Turn
The operating principle is the same as with the left
turn. For the right turn, however, the gap between the
input shaft (1) and sleeve (3) is in the direction opposite
to that of left turn. By so doing, the cylinder's chamber
"b" comes under high pressure and the ball nut (4) is
moved to the left. Finally the sector shaft (6) gets turned
to turn the machine to the right.
(1) Input Shaft
(2) Torsion Bar
(3) Sleeve
(4) Ball Nut
Manual Operation in Case of Hydraulic System
Failure
Let's suppose that the hydraulic system gets in
trouble due to a damaged pump, damaged pipe or the
like and that the steering resistance is too high to use the
power steering system. In such case, the steering wheel
can be in the manual mode. When the steering wheel is
turned, the torsion bar is twisted for the valve's stroke
and from now on the steering wheel functions in the
manual mode. It should be noted that the steering
wheel's play becomes larger than that in the power
steering mode.
7-M4
STEERING
a: Chamber
b: Chamber
P: Pump Port
9Y1211012STM0005US0
(5) Main Shaft
(6) Sector Shaft
(7) Gear Box
9Y1211012STM0006US0
(5) Main Shaft
(6) Sector Shaft
(7) Gear Box
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9Y1211012STM0008US0
KiSC issued 09, 2016 A