Workshop Manuals Factory service & repair Land Rover
Land Rover Defender 90 Workshop Manual (NAS)17 · Steering
17 · Steering & suspension

Insufficient power assistance

Make
Land Rover
Model
Defender 90 Workshop Manual (NAS)
Section
Fault diagnosis › Insufficient power assistance
SteeringInsufficient power assistance

INSUFFICIENT POWER ASSISTANCE

  1. Is fluid level correct? YES - go to 3. possibly damaging seals. NO - Fill/bleed sytem
  2. Is problem a leak? YES - Diagnose See Power Steering Fluid .

Leaks

NO - continue

  1. Is drive belt tension correct? YES - go to 5. following: PAS system leaks, faulty PAS pump NO - retension See ELECTRICAL, Repair, relief valve, fault in steering box valve and worm Auxiliary drive belt assembly, leak at piston in steering box, worn components in PAS pump or box.
  2. Is problem resolved? YES - end NO - continue
  3. Carry out pressure test at idle and 1000 rev/min. .

See Power Steering System - Test

  1. Is correct pressure achieved? YES - steering box defective Not at any speed go to 9. Not at idle go to 7.
  2. Is idle speed correct? YES - Go to 8. NO - Correct idle speed - See FUEL SYSTEM, .

Adjustment, Engine tuning

  1. Is problem resolved? YES - end NO - go to 9.
  2. Bypass steering box using adaptor tap LRT-57-001
  3. Is correct pressure obtained? YES - defective steering box NO - defective steering pump
  • CAUTION: Do not hold steering wheel on
  • full lock for more than 30 seconds in any
  • one minute to avoid overheating fluid and
  • NOTE: 1. Excessive pressure in the
  • system is almost always caused by a
  • faulty relief valve in the PAS pump.
  • NOTE: 2. Insufficient pressure in the
  • system is usually caused by low fluid level
  • or PAS pump drive belt slip, or one of the

Parts & tools for this job For Land Rover Defender

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