Range Rover Classic. Manual — part 108
STEERING
7
OVERHAUL
Fitting sector shaft cover
73. Fit new sealing ring to cover.
74. Align cover with casing.
75. Screw cover assembly fully on to sector shaft
adjuster screw.
76. If necessary back off sector shaft adjuster screw.
Tap cover in place to allow cover to joint fully
with casing.
NOTE: Before tightening fixings, rotate
input shaft to ensure sector shaft roller is
free to move in valve worm. If initial
resistance is left, turn adjuster screw
approximately two turns in a clockwise direction.
77. Fit cover bolts. Tighten to
75 Nm.
Fitting cylinder cover
78. Fit new square section seal to cover.
79. Remove slave bolt fitted at instruction 68. Press
cover into cylinder just to clear retainer ring
groove.
80. Fit retaining ring to groove with one end of ring
positioned 12 mm from extractor hole.
Adjusting sector shaft
NOTE: Refit drop arm and tighten nut
sufficiently to ensure that no backlash
exists between drop arm and sector shaft.
81. To set worm on centre, rotate input shaft to full
inner-lock (full right lock for a left hand drive
vehicle, full left lock for a right hand drive
vehicle). Rotate input shaft back towards centre
two full turns.
82. The box is now on centre and can be adjusted.
57
STEERING
8
OVERHAUL
83. Hold input shaft and rock drop arm to establish
backlash is present. Continue rocking and slowly
turn sector shaft adjusting screw clockwise.
Continue rotating adjuster screw until backlash
has almost been eliminated.
84. Refit locknut and tighten.
NOTE: It is important steering box is
centralised before any adjustments are
made.
85. Check maximum rolling torque one and a quarter
turns either side of centre position, using a
torque wrench and spline socket LRT-57-025.
Rotate adjuster screw to obtain across centre
torque of 0.34 Nm plus torque figure at one and
a quarter turns. Tighten adjuster locknut to
60
Nm.
Adjusting rack adjuster.
86. Turn in rack adjuster to increase figure
measured in instruction 85. by 0.23 - 0.34 Nm.
The final figure may be less, but must not
exceed 1.35 Nm.
87. Lock rack adjuster in position with grub screw.
Tighten to
5 Nm.
Torque peak check
With input shaft rotated from lock to lock, rolling
torque figures should be greatest across centre
position and equally disposed about centre position.
The condition depends on value of shimming fitted
between valve and worm assembly inner bearing cup
and casing. The original shim washer value will give
correct torque peak position unless major components
have been replaced.
Procedure
88. With input coupling shaft toward the operator,
turn shaft fully counter-clockwise.
89. Check torque figures obtained from lock to lock
using torque wrench and spline socket
LRT-57-025.
90. Check also for equal engagement either side of
centre.
Adjustments
91. Note where greatest figures are recorded
relative to steering position.If greatest figures are
not recorded across centre of travel (steering
straight-ahead), adjust as follows:
If torque peak occurs before centre position, add to
shim washer value; if torque peak occurs after centre
position, subtract from shim washer value, refer to
fitting valve and worm assembly .
Shim washers are available as follows:
0.03mm, 0.07mm, 0.12mm and 0.24mm.
NOTE: Adjustment of 0.07mm to shim
value will move torque peak area by 1/4
turn on the shaft.
CAUTION: When reshimming valve and
worm, extreme caution must be exercised
to prevent seal damage during
reassembly.
STEERING
9
OVERHAUL
Input shaft oil seal
92. Fit seal, lip side first, into housing. Use seal
saver LRT-57-016 and seal installer
LRT-57-026. Note that seal is fitted to a depth of
4.75 - 5.00 mm from face of box.
93. Secure seal with circlip.
94. Smear inner lip of dirt excluder with PTFE
grease. Fit dirt excluder using LRT-57-027.
When fitted correctly outer shoulder of excluder
is 4.00 - 4.50 mm from face of box, dimension X
in RR3941M.
95. Remove drop arm. Smear inner lip of dirt
excluder with PTFE grease and refit, ensuring
outer lip is flush with casing.
96. With input shaft on centre, line up centralising
holes in drop arm and steering box see inset in
RR3940M. Fit drop arm to steering box using a
new tab washer. Tighten to
176 Nm, bend over
tab.
97. Fit steering box.
See Repair, Power Steering
Box
STEERING
1
SPECIFICATIONS, TORQUE
STEERING PUMP
Make/type - V8i
ZF ’Unicorn’
. . . . . . . . . . . . . . . .
Make/type - Tdi
Hobourn Eaton 500 series
. . . . . . . . . . . . . . . .
Operating pressure - straight ahead position - at idle
7 bar, 100 lbf/in
2
maximum
. ..
Full lock (left or right) at idle
28 bar, 400 lbf/in
2
minimum
. . . . . . . . . . . .
Full lock (left or right) 1000 rev/min
70-77 bar, 1000-1100 lbf/in
2
. . . . . . . . ..
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