Isuzu 2000 Trooper Workshop Manual page 177

Power Steering Pump
Foaming milky power steering fluid, low fluid level, and
possible low pressure can be caused by air in the fluid, or
loss of fluid due to internal pump leakage. Check for leak
and correct. Bleed the system. Extremely cold tempera-
tures will cause air bubbles in the system if the fluid level
Condition
Low Pressure Due to Steering Pump
Low Pressure Due to Steering Gear
Growling Noise In Steering Pump
Groaning Noise In Steering Pump
Rattling Noise In Steering Pump
Swishing Noise In Steering Pump
Whining Noise In Steering Pump
Steering Column Lock System
Condition
Will Not Unlock
Will Not Lock
Key Cannot be Removed
"OFF-LOCK" "OFF LOCK"
Column
Condition
Noise in Column
Possible cause
Relief valve sticking or inoperative.
Side plate not flat against cam ring.
Extreme wear of cam ring.
Scored side plate or rotor.
Vanes sticking in rotor slots.
Cracked or broken side plate.
High internal leakage.
Scored housing bore.
Excessive back pressure in hoses or
steering unit caused by restriction.
Scored side plate or rotor.
Worn cam ring.
Air in the fluid.
Low fluid level.
Pump mounting loose.
Vanes sticking in rotor slots.
Vane improperly installed.
Damaged relief valve.
Scored side plate and vanes.
Possible cause
Damaged lock cylinder.
Damaged park lock cable.
Lock spring broken or worn.
Damaged lock cylinder.
Ignition switch stuck.
Park lock cable damaged.
in Ignition switch is not set correctly.
Damaged lock cylinder.
Faulty shift lock mechanism.
Possible cause
Universal joint loose.
Shaft lock snap ring not seated.
POWER ASSISTED SYSTEM
is low. If the fluid level is correct and the pump still foams,
remove the pump from the vehicle and check the housing
for cracks. If the housing is cracked, replace the pump
housing.
Replace relief valve.
Replace side plate.
Replace cam ring.
Replace side plate or rotor.
Repair or replace vanes and rotor.
Replace side plate.
Repair internal leakage.
Replace housing.
Repair steering unit or pump.
Replace side plate or rotor.
Replace cam ring.
Bleed hydraulic system.
Replenish fluid.
Tighten mounting bolt.
Repair or replace vanes and rotor.
Repair rotor and vane.
Replace relief valve.
Replace side plate and vanes.
Replace lock cylinder.
Replace park lock cable.
Replace lock cylinder.
Replace lock cylinder.
Repair or replace ignition switch.
Replace park lock cable.
Correct ignition switch.
Replace lock cylinder.
Repair or replace the shift lock
mechanism.
Tighten joint.
Place snap ring in proper position.
2A–9
Correction
Correction
Correction