Mitsubishi 380. Manual - part 852

POWER STEERING DIAGNOSIS

POWER STEERING

37-6

STEP 7. Check the gear box rack piston seal for damage.

Q: Is there damage?

YES : Replace it. And then go to Step 9.
NO :  Go to Step 8.

STEP 8. Check for excessive tie rod end ball joint 
breakaway torque.
 Refer to 

P.37-15

.

Q: Is the breakaway torque out of specification?

YES : Replace the tie rod end. And then go to Step 9.
NO :  Go to Step 9.

STEP 9. Check the steering wheel operation.
Verify that the steering wheel operation is not difficult.

Q: Is the steering wheel operation difficult?

YES : Repeat from Step 1.
NO :  The procedure is complete.

INSPECTION PROCEDURE 3: Rattling Noise

DIAGNOSIS

STEP 1. Check for proper oil pump and steering 
gear installation.

Q: Is the oil pump and the steering gear installation 

correct?
YES : 

Go to Step 2.

NO : 

Repair it. And then go to Step 4.

STEP 2. Check for interference of other parts with 
the steering column and the power steering 
hoses.

Q: Is there interference?

YES : 

Correct the interference. And then go to 

Step 4.

NO : 

Go to Step 3.

STEP 3. Check for noise from inside the oil pump 
or the steering gear.

Q: Is there noise?

YES : 

Replace the part. And then go to Step 4.

NO : 

Go to Step 4.

STEP 4. Check for rattling noise.
Confirm that no noise is generated.

Q: Is there noise?

YES : 

Repeat from Step 1. 

NO : 

The procedure is complete.

POWER STEERING DIAGNOSIS

POWER STEERING

37-7

INSPECTION PROCEDURE 4: Shrill Noise

DIAGNOSIS

STEP 1. Check the fluid level.
(1)  Park the vehicle on a flat, level surface, and then start the 

engine.

(2) Turn the steering wheel several times to raise the 

temperature of the fluid to approximately 50 

− 60°C (122 − 

140

°F).

(3)  With the engine running, turn the wheel all the way to the 

left and right several times.

(4) Check the fluid in the oil reservoir for foaming or milkiness. 

Check the difference of the fluid level when the engine is 
stopped, and while it is running.

Q: Is the check result OK?

YES : Go to Step 2.
NO :  Bleed the air (Refer to 

P.37-18

). And then go to Step 

3 .

STEP 2. Check for seizure in the oil pump.

Q: Is there seizure?

YES : Replace the part. And then go to Step 3.
NO :  Go to Step 3.

STEP 3. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : Repeat from Step 1.
NO :  The procedure is complete.

INSPECTION PROCEDURE 5: Squealing Noise

DIAGNOSIS

STEP 1. Check the drive belt tension.
Refer to GROUP 00, Maintenance Service 

− Drive 

Belts 

P.00-39

.

Q: Is the drive belt tension incorrect?

YES : 

Adjust the belt tension. (Refer to GROUP 

00, Maintenance Service 

− Drive Belts 

P.00-39

). And then go to Step 3.

NO : 

Go to Step 2.

STEP 2. Check for seizure in the oil pump.

Q: Is there seizure?

YES : 

Replace the part. And then go to Step 3.

NO : 

Go to Step 3.

STEP 3. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : 

Repeat from Step 1.

NO : 

The procedure is complete.

ACX01131

WHILE ENGINE

RUNNING

WHILE ENGINE

STOPPED

AB

FLUID FLUCTUATION

POWER STEERING DIAGNOSIS

POWER STEERING

37-8

INSPECTION PROCEDURE 6: Hissing Noise

DIAGNOSIS

STEP 1. Check the fluid level.
(1)  Park the vehicle on a flat, level surface, and then start the 

engine.

(2) Turn the steering wheel several times to raise the 

temperature of the fluid to approximately 50 

− 60°C (122 − 

140

°F).

(3)  With the engine running, turn the wheel all the way to the 

left and right several times.

(4) Check the fluid in the oil reservoir for foaming or milkiness. 

Check the difference of the fluid level when the engine is 
stopped, and while it is running.

Q: Is the check result OK?

YES : Go to Step 2.
NO :  Bleed the air (Refer to 

P.37-18

). And then go to Step 

4 .

STEP 2. Check each hose for crushing or twisting.

Q: Is any hose crushed or twisted?

YES : Repair or replace the hose. And then go to Step 4.
NO :  Go to Step 3.

STEP 3. Check the steering gear for damage.

Q: Is there damage?

YES : Repair or replace the part. And then go to Step 4.
NO :  Go to Step 4.

STEP 4. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : Repeat from Step 1.
NO :  The procedure is complete.

INSPECTION PROCEDURE 7: Droning Noise

NOTE: If a slight "beat noise" is produced by the oil 
pump when the steering wheel is turned fully and 
held in that position, this is normal.

DIAGNOSIS

STEP 1. Check the oil pump or oil pump bracket 
installation.

Q: Is the oil pump or the oil pump bracket installation 

correct?
YES : 

Go to Step 2.

NO : 

Repair it. And then go to Step 3.

ACX01131

WHILE ENGINE

RUNNING

WHILE ENGINE

STOPPED

AB

FLUID FLUCTUATION

POWER STEERING DIAGNOSIS

POWER STEERING

37-9

STEP 2. Check the oil pump for damage.

Q: Is there damage?

YES : 

Replace the oil pump. And then go to Step 

3.

NO : 

Go to Step 3.

STEP 3. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : 

Repeat from Step 1.

NO : 

The procedure is complete.

INSPECTION PROCEDURE 8: Squeaking Noise

DIAGNOSIS

STEP 1. Check for interference of the wheel and the 
vehicle body.
If interfering, adjust the steering angle.
(1) Place the front wheel on a turning radius gauge and 

measure the steering angle.

Standard value:

(2) If the steering angle is not within the standard value, adjust 

the toe.

Standard value: 0 

± 3 mm (0 ± 0.12 inch)

(3) Adjust the toe by undoing the clip and jam nut, and turning 

the left and right tie rod turnbuckles by the same amount (in 
opposite directions).

NOTE: The toe will move out as the left turnbuckle is turned 
toward the front of the vehicle and the right turnbuckle is 
turned toward the rear of the vehicle.

Q: Is the steering angle normal?

YES : Go to Step 2.
NO :  Repeat the toe adjustment. And then go to Step 3.

STEP 2. Check the steering gear for damage.

Q: Is there damage?

YES : Repair or replace the part. And then go to Step 3.
NO :  Go to Step 3.

STEP 3. Retest the system.
Confirm that no noise is generated.

Q: Is there noise?

YES : Repeat from Step 1.
NO :  The procedure is complete.

ITEM

17" WHEELS

16" WHEELS

Inner wheel

33

°48' ± 2°00'

37

°12' ± 2°00'

Outer wheel
(reference)

28

°18'

30

°18'

AC000756AB

AC305785

AB

JAM NUT

CLIP