Range Rover. Manual — part 175
STEERING
3
FAULT DIAGNOSIS
Symptom - Light Steering or Free Play At Steering Wheel.
POSSIBLE CAUSE
REMEDY
1. Front tyres over inflated.
1. Inflate tyres to correct pressure.
See GENERAL SPECIFICATION
DATA, Information.
2. Incorrect tyres fitted.
2. Fit tyres of correct specification.
See GENERAL SPECIFICATION
DATA, Information.
3. Worn front suspension
component bushes.
3. Check component bushes for wear and renew as necessary.
See
FRONT SUSPENSION, Repair.
4. Excessive free play in steering
linkage.
4. Check steering linkage components and adjust or renew as
necessary
See Repair.
5. Excessive free play in swivel
pin.
5. Check swivel pin components and adjust or renew as necessary.
6. Steering box alignment
incorrect causing excessive
back lash.
6. Centralize steering box.
See Repair.
7. Excessive free play in steering
column intermediate shaft
universal joint.
7. Check and renew intermediate shaft.
See Repair.
8. Excessive free play in steering
column bearings or universal
joint.
8. Renew steering column.
See Repair.
Symptom - Steering Vibration, Road Wheel Shimmy - Wobble.
POSSIBLE CAUSE
REMEDY
1. Road wheel/s out of balance.
1. Rebalance road wheel/s.
2. Worn/damaged steering
damper.
2. Renew steering damper.
See Repair.
3. Worn PAS components,
mountings and fixings.
3. Check and renew steering components, mountings and fixings as
necessary.
See Repair.
4. Worn front suspension
components, mountings and
fixings.
4. Check and renew suspension components, mountings and fixings.
See FRONT SUSPENSION, Repair.
5. Incorrect steering geometry.
5. Carry out full steering geometry check.
See Adjustment.
57
STEERING
NEW RANGE ROVER
4
FAULT DIAGNOSIS
Symptom - Steering Stablity and Veer Under Braking.
POSSIBLE CAUSE
REMEDY
1. Unbalanced front tyre
pressures, side to side.
1. Ensure that front tyres are inflated to correct pressure.
See
GENERAL SPECIFICATION DATA, Information.
2. Oil contamination of brake
discs and pads.
2. Thoroughly clean brake discs and renew brake pads, in axle sets.
See BRAKES, Repair. Check cause of contamination and rectify
as necessary.
3. Seized front brake caliper
pistons or damaged brake
discs.
3. Renew brake caliper.
Refer to Front caliper.
See BRAKES, Repair. or
Refer to Brake disc and shield.
See BRAKES, Repair.
Symptom - Steering Veer - General
POSSIBLE CAUSE
REMEDY
1. Front tyre construction
different, side to side
1. Swap front tyres side to side. If vehicle now veers in other direction,
fit new tyres.
See GENERAL SPECIFICATION DATA,
Information.
2. Steering box set off centre.
2. Centralize steering box.
See Adjustment.
Symptom - Poor Directional Stability
POSSIBLE CAUSE
REMEDY
1. Worn/damaged steering
damper.
1. Renew steering damper.
See Repair.
2. Road wheel/s out of balance.
2. Rebalance road wheels.
3. Front or/and rear tyres inflated
to different pressures.
3. Ensure that all tyres are inflated to specified pressures.
See
GENERAL SPECIFICATION DATA, Information.
4. Faulty component/s in front
suspension system.
4. Check front suspension components.
See FRONT SUSPENSION,
Fault diagnosis.
5. Faulty component/s in rear
suspension system.
5. Check rear suspension components.
See REAR SUSPENSION,
Fault diagnosis.
STEERING
5
FAULT DIAGNOSIS
Symptom - Power Steering System - Excessive Noise.
POSSIBLE CAUSE
REMEDY
1. Incorrect fluid level in oil
reservoir.
1. Top up or drain fluid to correct level and bleed PAS system.
See
Repair.
2. High pressure hose from
steering pump to box in foul
condition with chassis or body.
2. Check that hose is correctly routed and secured.
3. Excessive lock angle, giving
loud ’hiss’.
3. Adjust steering lock to correct position.
See Adjustment.
4. Insufficient lock angle, giving
squeal on full lock.
4. Adjust steering lock to correct position.
See Adjustment.
5. Air in the PAS system, giving a
continuous moan.
5. Bleed the PAS system.
See Repair.
6. Seized steering pump
bearings.
6. Renew pump.
See Repair.
7. Start up noise from PAS in
excessive cold climate.
7. Use optional Cold Climate PAS Fluid.
57
STEERING
NEW RANGE ROVER
6
FAULT DIAGNOSIS
POWER STEERING SYSTEM - TEST
Service repair no - 57.90.10/01
A
Steering box
B
Steering pump
C
Adaptor block LRT-57-031
D
Hose LRT-57-031
E
Test valve LRT-57-001
F
Pressure gauge LRT-57-005
G
Hose LRT-57-030
Test Equipment - Assembly
1. Remove nut securing existing high and low
pressure pipes to steering box A.
2. Remove both banjo bolts from steering box.
Collect sealing washers.
3. Release existing pipes beneath radiator to allow
manipulation at steering box.
4. Connect existing low pressure pipe to steering
box. Secure with banjo bolt.
5. Fit hose D to adaptor block C. Fit assembly to
high pressure port of steering box. Secure with
banjo bolt.
6. Connect existing high pressure pipe to adaptor
block. Secure with banjo bolt.
NOTE: The high pressure pipe and hose D,
could be transposed depending on hand
of drive.
7. Fit hose G to adaptor block C.
8. Connect pressure gauge F to test valve E.
Connect hoses D and G to test valve E.
9. Ensure steering system is free from leaks.
Maintain maximum fluid level during test.
Test Procedure
NOTE: If power steering lacks assistance,
check pressure of hydraulic pump before
fitting new components. Use fault finding
chart to assist tracing faults.
1. A hydraulic pressure gauge and adaptor is used
to test the power steering system.
2. When testing the system, turn the steering wheel
gradually while reading the pressure gauge.
3. With the test valve open start the engine.
4. With the engine at 1500 rev/min, turn the
steering wheel. Hold on full lock.
5. Repeat pressure check in opposite lock.
6. The test pressure should be between
35 and 75 bar (507 and 1090 lbf/in
2
), depending
on the road surface. Pressure will drop back to
between 32 and 48 bar (464 and 696 lbf/in
2
),
when held in full lock.
7. With the engine idling, release the steering
wheel. Pressure should read below 7 bar
(102 lbf/in
2
).
8. Pressures outside the above tolerances indicate
a fault.
9. To determine if the fault is in the steering box or
steering pump. Close the test valve, for a
maximum of five seconds.
CAUTION: Pump damage will occur if test
valve is closed for longer periods.
10. If the gauge does not register between 100 and
110 bar (1450 and 1595 lnf/in
2
) (maximum pump
pressure), the pump is faulty.
11. If maximum pump pressure is correct, suspect
the steering box.
12. On completion, remove the test equipment and,
using new sealing washers, connect pipes to
pump with banjo bolts.
M16 bolts: Tighten to
50 Nm (37 lbf.ft).
M14 bolts: Tighten to
30 Nm (22 lbf.ft).
13. Check fluid level.
See LUBRICANTS, FLUIDS
AND CAPACITIES, Information.
14. Bleed power steering system.
See Repair.
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