TRW TA S40 Series, Service Manual

Page: 54 / 60

Page 1-54 TRW TAS STEERING GEAR DocID
STEERING GROUP 0603-V-003-0207
File Last Modified: September 17, 2012 10:18 am
53
Tools Required
Box-end wrench
In
•
lb Torque wrench
Ft
•
lb Torque wrench
Screwdriver
Sockets
Materials Required
Final Adjustments
1. To center the steering gear, rotate input shaft, valve worm
assembly (19) until the timing mark on the end of the sector
shaft (41) is in line with the timing mark on the end of housing
trunnion.
Center steering
gear
Do not rotate the input shaft more
than 1.5 revolutions from center po-
sition until the steering gear is installed, during poppet
setting procedure. Doing so could make the automatic
poppets inoperative, which would require disassembly
of steering gear to reposition poppet seat and sleeve
assemblies.
Initial poppet contact will occur at less
than one input shaft rotation in one
direction from steering gear center position, if new or reset
poppet adjuster seat and sleeve assemblies are assembled in
the unit.
Worm preload adjustment was set
when input shaft, valve and worm were
assembled into valve housing.
3 ⁄
4
"
and 11 ⁄
16
"
Socket or box
end wrench
2 With adjusting screw jam nut (46) loose, turn sector shaft
adjusting screw clockwise to provide
45-50 in
•
lb (5-5.5 N
•
m) of
torque required to rotate the input shaft, valve/worm assembly
through one half turn (180°) each side of center.
Tighten adjusting
screw
This procedure will properly mesh and
seat the rack piston and sector shaft
teeth for final adjustments.
Lbf
•
in. Torque
wrench
Screwdriver
11 ⁄
16
"
or 3 ⁄
4
"
Socket
Loosen adjusting
screw and note
torque
In
•
lb Torque
wrench
Screwdriver
11 ⁄
16
"
Socket
3. Turn sector shaft adjusting screw counterclockwise one half turn
and
note maximum torque required to rotate the input shaft,
valve/worm assembly through one half turn (180°) each side of
center.