Defender 90 NAS. Manual — part 59
STEERING
11
REPAIR
STEERING DAMPER
Service repair no - 57.55.21
Remove
1. Raise vehicle on a ramp [hoist].
2. Remove 2 nuts securing steering damper to
chassis member and collect washer.
3. Remove nut and bolt securing steering damper
to drag link.
4. Release steering damper from drag link and
chassis member and remove.
Refit
5. Position damper to chassis member and drag
link.
6. Fit bolt and new nut securing damper to drag link
and tighten.
7. Fit washer and nuts securing steering damper to
chassis and tighten.
8. Lower vehicle.
57
STEERING
12
REPAIR
DRAG LINK AND DRAG LINK ENDS
Service repair no - 57.55.17
Remove
1. Park vehicle on level ground and chock rear
wheels.
2. Set road wheels in straight ahead position.
3. Raise vehicle and fit axle stands or use a ramp.
4. Remove front road wheel.
5. Disconnect steering damper at drag link bracket.
6. Remove split pin and castellated nut securing
drag link ball joints to swivel housing arms.
7. Disconnect drag link ball joints using
LRT-57-018.
8. Remove drag link.
Remove drag link ends
9. Slacken clamp bolts.
10. Unscrew ball joints and remove from drag link.
11. Clean internal threads of drag link.
Refit drag link ends
12. Fit new ends to drag link and loosely fit clamp
bolts.
13. Set ball joints to drag link measurement to 28,5
mm.
14. Adjust ball pin centres to nominal length of 924
mm, this length is adjusted during refit.
STEERING
13
REPAIR
15. Centralise steering box
See Adjustment,
Centralise steering box .
16. Align steering wheel, if necessary.
Refit drag link
CAUTION: A drag link that is damaged or
bent must be renewed. DO NOT attempt to
repair it.
17. Fit drag link to swivel housing arms and tighten
nuts to
40 Nm (30 lbf/ft). Fit new split pins.
18. Ensure full steering travel is obtained between
lock stops
See Adjustment, Steering lock
stops. Adjust drag link length to suit.
19. Tap ball joints in direction shown so both pins
are in same angular plane.
20. Tighten clamp bolts to
14 Nm, 10 lbf/ft.
21. Refit road wheel and remove axle stands or
vehicle from ramp.
22. Road test vehicle.
23. If driving straight ahead and steering wheel is
offset by 0
° ±
5
°
in either direction, correct by
adjusting drag link length.
WARNING: To correct steering wheel
deviations greater than
±
5
°
remove and
reposition steering wheel
See Steering
wheel.
STEERING
1
OVERHAUL
POWER STEERING BOX
Service repair no - 57.10.07
WARNING: Wear safety glasses while
removing and refitting circlips and
retaining ring.
CAUTION: Absolute cleanliness is
essential when overhauling the power
steering box.
1. Remove steering box from vehicle.
See Repair,
Power Steering Box . Mark drop arm and
steering box for realignment on assembly.
Remove drop arm using extractor LRT-57-012.
Loosen drop arm securing nut, but do not
remove before using extractor. Remove dirt
excluder from output shaft.
2. Drain oil, remove blanking plugs and bleed
screw. Hold steering box over drain tin, turn
input shaft from lock to lock, until oil is drained.
Refit bleed screw.
3. Rotate retainer ring until one end is 12 mm from
extractor hole. Using a drift through hole in
cylinder, lift retaining ring from groove in cylinder
bore.
4. Remove retainer ring, using a screwdriver.
5. Turn input shaft left lock on LH drive, right lock
on RH drive, until piston pushes out cover. Turn
input shaft fully in opposite direction, applying
pressure to piston.
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