Mitsubishi Grandis. Manual — part 980

ON-VEHICLE SERVICE

POWER STEERING

37-10

TIE ROD END BALL JOINT TURNING
TORQUE CHECK

M1372001500402

CAUTION

• Do not remove the tie rod end nut from the

ball joint. Loosen it and use special tool to
avoid possible damage to the ball joint
threads.

• Hang special tool with cord to prevent it from

falling.

1. Install special tool ball joint remover (MB991897)

as shown in the figure.

2. Turn the bolt and knob as necessary to make the

jaws of special tool parallel, tighten the bolt by
hand and confirm that the jaws are still parallel.
NOTE: When adjusting the jaws in parallel, make
sure the knob is in the position shown in the
figure.

3. Tighten the bolt with a wrench to disconnect the

tie rod end.

4. Move the ball joint stud several times and install

the nut on the stud. Using special tool preload
socket (MB990326), measure the ball joint turning
torque.

Standard value: 3.9 N

⋅m or less

5. If the turning torque exceeds the standard value,

replace the tie rod end. (Refer to

P.37-24

)

6. If the turning torque is under the standard value,

check the ball joint for axial play or ratcheting. If
no axial play or ratcheting, the ball joint can be
re-used. (Refer to

P.37-24

)

CAUTION

Always use a new ball joint nut as it is a
self-locking nut.
7. Install the tie rod end to the knuckle, then tighten a

new self-locking nut to the specified torque.

Tightening torque: 25

± 5 N⋅m

STATIONARY STEERING EFFORT CHECK

M1372001700451

1. With the vehicle stopped on a flat and paved

surface, turn the steering wheel to the straight
ahead position.

2. Start the engine and set the engine idle speed.

Standard value: 1000

± 100 r/min

3. Attach a spring balance to the outer

circumference of the steering wheel and measure
the steering force required to turn the steering
wheel from the straight ahead position to the left
and right (within a range of 1.5 turns). Also check
to be sure that there is no significant change in
the required steering effort.

Standard value:

Steering effort: 25 N or less
Fluctuation allowance: 6.0 N or less

4. If the measured value exceeds the standard

value, check and adjust the related parts.

AC208247AD

Cord

Bolt

MB991897

Nut

Ball joint

AC106821

Knob

Parallel

Bolt

Good

Bad

AB

ACX01129 AB

MB990326

ACX01122 AB

ON-VEHICLE SERVICE

POWER STEERING

37-11

STEERING WHEEL RETURN TO CENTRE
CHECK

M1372001800403

Conduct a road test:
1. Make both gradual and sudden turns and check

the steering wheel return.

2. At a vehicle speed of approximately 35 km/h, turn

the steering wheel 90

°, hold a few seconds, then

release. If the steering wheel then returns 70

° or

more, the return can be judged satisfactory.
NOTE: There will be a momentary feeling or
"heaviness" when the wheel is turned quickly, but
this is not abnormal (Oil pump discharge amount
is especially apt to be insufficient during idling).

DRIVE BELT TENSION CHECK

M1372001900369

Refer to GROUP 11A, On-vehicle Service

− Drive

Belt Tension Check

P.11A-7

.

FLUID LEVEL CHECK

M1372002000381

1. Park the vehicle on a flat, level surface.
2. Start the engine, and then turn the steering wheel

several times to raise the temperature of the fluid
to approximately 50

− 60°C.

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. If the change of the fluid level is 5 mm or
more, air bleeding should be done.

FLUID REPLACEMENT

M1372002100441

1. Raise and support the front wheels.

2. Disconnect the return hose connection, and then

connect a vinyl hose to the return hose, and drain
the fluid into a container.

3. Disconnect the ignition coil connectors (Refer to

GROUP 16, Ignition Coil

P.16-27

).

4. While operating the starter motor intermittently,

turn the steering wheel all the way to the left and
right several times to drain all of the fluid.

5. Connect the return hose securely, and then

secure with the clip.

6. Fill the oil reservoir with specified fluid up to

between "MAX" and "MIN" marks, and then bleed
the air.

Specified fluid: ATF DEXRON III or DEXRON
II

POWER STEERING SYSTEM AIR
BLEEDING

M1372002200437

Perform air bleeding procedure as necessary after
replacing the steering gear or the steering fluid lines.
1. Raise and support the front wheels.
2. Disconnect the ignition coil connectors (Refer to

GROUP 16, Ignition Coil

P.16-27

).

ACX01130AB

70˚

70˚

ACX01131

While engine running

While engine stopped

AC

Fluid level change: Within 5 mm

AC313168AB

Return hose

Return hose

Vinyl hose

ON-VEHICLE SERVICE

POWER STEERING

37-12

CAUTION

Perform air bleeding only while cranking the
engine. If air bleeding is performed while the
engine is running, air could enter the fluid.
During air bleeding, refill the steering fluid
supply so that the level never falls below the
"MIN" mark on the oil reservoir.
3. Turn the steering wheel all the way to the left and

right five or six times while using the starter motor
to crank the engine intermittently several times
(for 15 to 20 seconds).

4. Connect the ignition coil connectors (Refer to

GROUP 16, Ignition Coil

P.16-27

).

5. Start the engine (idling).
6. Turn the steering wheel to the left and right until

there are no air bubbles in the oil reservoir.

7. Confirm that the fluid is not milky, and that the

level is between "MAX" and "MIN" marks.

8. Confirm that there is very little change in the fluid

level when the steering wheel is turned left and
right.

CAUTION

If the fluid level rises suddenly after the engine is
stopped, the air has not been completely bled. If
air bleeding is not complete, there will be
abnormal noises from the pump and the
flow-control valve, and this condition could
cause reduce the life of the power steering
components.

9. Confirm that the change in the fluid level is no

more than 5 mm when the engine is stopped and
when it is running.

10.If the change of the fluid level is 5 mm or more,

the air has not been completely bled from the
system. The air bleeding procedure must be
repeated.

OIL PUMP PRESSURE TEST

M1372002300412

1. Disconnect the pressure hose from the oil pump,

and then connect the following special tools.

• MB990662: Power Steering Oil Pressure Gauge

• MB991548: Power Steering Oil Pressure Gauge

Adapter (pump side)

• MB991549: Power Steering Oil Pressure Gauge

Adapter (hose side)

2. Bleed air, then turn the steering wheel several

times while the vehicle is not moving so that the
temperature of the fluid rises to approximately 50
− 60°C.

3. Start the engine and idle it at 1000

± 100 r/min.

4. Fully close the shut-off valve of the pressure

gauge and measure the oil pump relief pressure
to confirm that it is within the standard value
range. Open it again immediately after checking
the pressure.

Standard value: 9.8

− 10.3 MPa

5. If it is not within the standard value, replace the oil

pump.

6. Check whether or not the hydraulic pressure is

the standard value when no-load conditions are
created by fully opening the shut-off valve of the
pressure gauge.

Standard value: 0.2

− 0.7 MPa

ACX01131

While engine running

While engine stopped

AC

Fluid level change: Within 5 mm

ACX01133

Temperature
gauge

Oil reservoir

Adapter
(MB991548)

Oil
pump

Adapter
(MB991549)

AB

Shut-off valve
(fully closed)

Pressure
gauge
(MB990662)

ON-VEHICLE SERVICE

POWER STEERING

37-13

7. If it is not within the standard value, the probable

cause is a malfunction of the oil line or steering
gear, so check these parts and repair as
necessary.

8. Turn the steering wheel all the way to the left or

right; then check whether or not the retention
hydraulic pressure is the standard value.

Standard value: 9.8

− 10.3 MPa

9. If not the standard value, overhaul the steering

gear. Remeasure fluid pressure.

10. Remove the special tools, and then tighten the

pressure hose to the specified torque.

Tightening torque: 57

± 7 N⋅m

11. Bleed the system (Refer to

P.37-11

).

TIE ROD END BALL JOINT DUST COVER
CHECK

M1372008600358

1. Press the dust cover with your finger to check

whether the dust cover is cracked or damaged.

2. If the dust cover is cracked or damaged, replace

the tie rod end.
NOTE: If the dust cover is cracked or damaged,
the ball joint could be damaged.

STEERING COLUMN SHAFT ASSEMBLY
SHOCK ABSORBING MECHANISM
CHECK

M1372013500250

If a collision accident occurs or severe impact is
applied on the steering wheel, the collision energy
absorbing mechanism may have operated. Once the
mechanism has operated, it will be inoperative even
it has suffered no apparent damage. Determine if the
steering column shaft can be reused by the following
procedure. If the collision energy absorbing
mechanism has already operated, replace the
steering column shaft assembly.
If any excessive radial free play on the steering
wheel is found with the tilt lever in the lock position,
always check the steering shaft assembly.

WARNING

•

If the vehicle continues to be driven after
the collision absorbing mechanism has
operated, the steering column shaft may
be damaged while it is in use.

•

If there is a slack in the one-way capsule,
do not attempt to repair it but replace the
steering column shaft assembly.

Inspection Procedure

1. Remove the lower and upper column covers.

CAUTION

Do not release the tilt lever until the steering
column has been installed to complete this
inspection procedure.
2. Ensure that the tilt lever is in the lock position.

NOTE: If not, place the tilt lever in the lock
position.

3. Loosen the two upper steering column mounting

bolts by two turns.

4. Hold the one-way capsules as shown, and then

try to lock them. If there is a slack in either of the
capsules, replace the steering column shaft
assembly.
NOTE: When installing a new steering column
shaft assembly, place the tilt lever in the lock
position, if it is not in place.

CAUTION

• Be careful that nothing is pinched between

the one-way capsules and the body.

• Do not release the tilt lever until the steering

column has been installed to complete this
inspection procedure.

5. If no problem is found during the inspection,

tighten the steering column mounting bolts to the
specified torque.

Tightening torque: 12

± 2 N⋅m

AC209935

Steering
column
assembly

AC

One way capsule

Steering
column
mounting
bolt