Installation Instructions

B1700·B2100·B2400 WSM,11770
7 STEERING
[1] HYDRAULIC CIRCUIT FOR POWER STEERING SYSTEM
10
r
[
22£/min ]
5.7 U.S.GPM
8
11 4.8 Imp.GPM
[
5£/min ]
1.3 U.S.GPM
1.1Imp.GPM
~
©
®
[
17£/min ]
4.4 U.S.GPM
3.7Imp.GPM
B177F701
(B) To Transmission (Manual Transmission Type Only)
(A) To Oil Cooler (HST Type Only)
(1) Sector Gear Shaft
(2) Balls
(3) Ball Nut
(4) Worm Shaft
(5) Sliding Valve
(6) Relief Valve
(7) Steering Wheel
(8) Flow Priority Valve
(9) Hydraulic Block Type
Outlet
(C) To Control Valve
(10) Pump
(11) Transmission Case
All models are available to be equipped with
integral type power steering that of sliding valve
with centering spring type.
Flow
priority valve (8) divides the oil fed to
hydraulic block type outlet (9) into two directions.
One
is the control flow to power steering (constantly
5 t'lmin., 1.3 U.S.GPM, 1.1 Imp.GPM at any engine
speed). And the other is excessive flow to control
valve.
The mechanical gear section
shown in the. next
page operates in the same way as ordinary manual
steeri ng systems. However,
with power steeri ng, the
worm shaft (4) is supported only by the centering
springs (13).
When
the worm thrust force (turning force of the
ball screw section) exceeds centering spring setting
load, the
worm shaft (4) axially shifts by a specified
displacement (Stroke:
about 0.4 mm (0.016 in.) ).
When a load
is applied to tires and. worm thrust force
required
for operation is greater than the centering
spring setting load,
turning the steering wheel does
not rotate the sector gear shaft (1), but rather axially
moves
the worm shaft (4). The valve spool (19), fixed
on
the worm shaft (4) by the nut (21), changes the
condition of the three-position, four-way open
center (all ports open) valve (5) by sliding in the valve
housing (20),
to generate pressure as required.
7-M1