1995 LAND ROVER DISCOVERY Workshop Manual

57STEERING
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 occursbeforecentre position,addto
shim washer value; if torque peak occursaftercentre
position,subtractfrom 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
2maximum ......
Full lock (left or right) at idle 28 bar, 400 lbf/in2minimum .............................................
Full lock (left or right) 1000 rev/min 70-77 bar, 1000-1100 lbf/in2..................................

57STEERING
2
SPECIFICATIONS, TORQUE TORQUE VALUES
NOTE: Torque wrenches should be regularly checked for accuracy to ensure that all fixings are
tightened to the correct torque.
Nm
Ball joint nuts 40..............................................................................................
Clamp bolt nuts 14..........................................................................................
Steering column bracket nuts 22....................................................................
Steering wheel nut 50.....................................................................................
Tie bar to mounting nut 110.............................................................................
Universal joint pinch bolt 25............................................................................
PAS box
Adjuster locknut 60.................................................................................
Drop arm nut 176....................................................................................
Sector shaft cover to steering box 75.....................................................
Steering box to chassis 81.....................................................................
Steering box fluid pipes 14mm thread 15...............................................
Steering box fluid pipes 16mm thread 20...............................................
Tie bar 81...............................................................................................
PAS pump
High pressure fluid pipe 20.....................................................................
Power steering pump mounting 35.........................................................
Pulley bolts, power steering pump 10....................................................
Hose clamp 3........................................................................................
Front mounting plate bolts 9..................................................................
PAS reservoir
Hose clamp 3........................................................................................
* Torque values below are for all screws and bolts used except for those that are specified otherwise.
METRIC Nm
M5 6......................................................................................................
M6 9......................................................................................................
M8 25.....................................................................................................
M10 45...................................................................................................
M12 90...................................................................................................
M14 105..................................................................................................
M16 180..................................................................................................
UNC / UNF
1/4 9......................................................................................................
5/16 24...................................................................................................
3/8 39.....................................................................................................
7/16 78...................................................................................................
1/2 90.....................................................................................................
5/8 136....................................................................................................

STEERING
1
SERVICE TOOLS POWER STEERING BOX
LRT-57-012 Drop arm extractor
LRT-57-007 'C' Wrench
LRT-57-006 Worm adjusting wrench
LRT-57-019 Ring expander

57STEERING
2
SERVICE TOOLS
LRT-57-020 Ring compressor
LRT-57-021 Seal saver, sector shaft
LRT-57-016 Seal saver, valve and worm
LRT-57-017 Torque setting tool

STEERING
3
SERVICE TOOLS
LRT-57-018 Ball joint remover
LRT-57-005 Pressure gauge
LRT-57-001 Test adaptor
LRT-57-022 Pressure test adaptors

FRONT SUSPENSION
1
DESCRIPTION AND OPERATION INTRODUCTION
Suspension design is a major factor in determining the comfort, safety and performance of any vehicle, but is
particularly significant to 4 wheel drive cross country vehicles. The ideal suspension must allow maximum wheel
travel and axle articulation, and provide good ground clearance without loss of traction or directional stability.
A well designed beam axle layout can embrace all of these qualities and also has the inherent advantage (over
independent systems) of no variation in wheel track or camber angle.
Suspension comparison
1. Beam axle system
2. Independent system