300Tdi Defender
57
STEERING
4
FAULT DIAGNOSIS
Symptom:-
Fluid leaks from steering box seals.
CAUTION: The steering wheel must not be
held on full lock for more than 30 seconds
in one minute, as this may overheat the
fluid and cause damage to the oil seals.
1. Check fluid level
See Repair, Power Steering
Fluid Reservoir .
Check fluid pressure
See Power Steering
System - Test .
2. Is pressure high?
YES - Renew pump
See Repair, Power
steering Pump .
If oil seal leaks persist after renewing the pump
See Overhaul, Power Steering Box .
NO -
See Overhaul, Power Steering Box .
Symptom:-
Insufficient power assistance - castor return
action normal.
1. Are tyres correct type and pressure?
NO -
See GENERAL SPECIFICATION DATA,
Information, Wheels and Tyres .
YES - Continue.
2. Is fluid level correct?
NO - Check fluid level
See Repair, Power
Steering Fluid Reservoir .
YES - Check system for air locks
See Repair,
Power Steering System - Bleed .
3. Is pressure correct?
NO - Check fluid pressure
See Power Steering
System - Test .
If pressure is not correct after bleeding the
system, renew pump
See Repair, Power
Steering Pump .
YES -
See Overhaul, Power Steering Box .
Symptom:-
Steering heavy - stiff, poor castor return action.
1. Are tyres correct type and pressure?
NO -
See INTRODUCTION, Information,
Wheels and Tyres .
YES - Check universal joints for seizure and
correct alignment
See Repair, Lower Steering
Shaft and Universal Joints .
Check power steering box adjustments
See
Overhaul, Power Steering Box .
2. Is the power assistance satisfactory?
NO - See fault symptom Insufficient
assistance, (castor return action normal).
YES - Disconnect drag link from drop arm and
check steering column and box for stiffness
See
Repair, Drag Link and Drag Link Ends .
3. Is the steering stiff with the drag link
disconnected?
NO - Check steering ball joints for seizure and
axle swivels lubrication and resistance
See
Repair, Drag Link and Drag Link Ends , See
FRONT AXLE AND FINAL DRIVE, Overhaul,
Front Stub Axle, Constant Velocity Joint and
Swivel Pin Housing .
YES - Disconnect the lower steering shaft and
check the column and box for stiffness
See
Repair, Lower Steering Shaft and Universal
Joints .
4. Is the steering column stiff to turn when
disconnected from the box?
NO - Remove and overhaul box
See Overhaul,
Power Steering Box .
YES - Adjust steering column
See Stiff
Steering Checklist .