Mitsubishi Montero (2002-2004). Manual — part 433

ON-VEHICLE SERVICE

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POWER STEERING

37A-19

POWER STEERING FLUID REPLACEMENT

M1372002100258

1. Jack up the front wheels and support them.
2. Disconnect the return hose A connection. (Refer to

P.37A-

49

.)

3. Connect a vinyl hose to the return hose A, and drain the fluid

into a container.

4. Disconnect the ignition coil connector. (Refer to GROUP 16,

IGNITION COIL

P.16-40

.)

5. While operating the starting motor intermittently, turn the

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

6. Connect the return hose A securely, and then secure with

the clip.

7. Fill the oil reservoir with GENUINE MITSUBISHI POWER

STEERING FLUID up to the lower position of the filler, and
then bleed the air.

POWER STEERING SYSTEM AIR BLEEDING

M1372002200255

1. Jack up the front wheels and support them.
2. Disconnect the ignition coil connector.

CAUTION

• During air bleeding, fill fluid so that its level is always

higher than the MIN line on the oil reservoir.

• If the air bleeding is performed by operating the engine,

air will break into small particles and melt into fluid. Be
sure to perform the air bleeding while cranking the
engine.

• If the steering wheel is turned all the way to the right

and left at the engine stop condition, the fluid may leak
from the reservoir or the reservoir cap may pop out.
Perform air bleeding while cranking the engine.

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. Start the engine (idling).
5. Turn the steering wheel to the left and right until there are no

air bubbles in the oil reservoir.

6. Confirm that the fluid is not milky, and that the level is

between the high and low dipstick marks.

7. Confirm that there is very little change in the fluid level when

the steering wheel is turned left and right.

ACX01132 AE

RETURN
HOSE A

VINYL HOSE

ON-VEHICLE SERVICE

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POWER STEERING

37A-20

8. Confirm that the change in the fluid level is no more than 5

mm (0.2 inch) when the engine is stopped and when it is
running.

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. If the change of the fluid level is 5 mm (0.2 inch) or more, the

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

OIL PUMP PRESSURE TEST

M1372002300241

Required Special Tools:

• MB990662: Pressure Gauge

• MB991548: Power Steering Oil Pressure Gauge Adapter

(Pump Side)

• MB991549: Power Steering Oil Pressure Gauge Adapter

(Hose Side)

1. Disconnect the pressure hose from the oil pump, and then

connect special tools MB991548, MB990662 and
MB991549.

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 (122 − 140°F).

3. Start the engine and idle it at 1,000

± 100 r/min.

CAUTION

The pressure gauge shut-off valve must not remain closed
for more than 10 seconds.
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: 8.3

− 9.0 MPa (1,209 − 1,305 psi)

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: 0.34 MPa (49.3 psi)

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

malfunction of the oil line or steering gear box, 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: 8.3

− 9.0 MPa (1,209 − 1,305 psi)

ACX01131

WHILE ENGINE
RUNNING

WHILE ENGINE
STOPPED

AB

FLUID FLUCTUATION

ACX01133

THERMOMETER

RESERVOIR

ADAPTER
(MB991548)

OIL
PUMP

ADAPTER
(MB991549)

AB

SHUT-OFF
VALVE

PRESSURE
GAUGE

ON-VEHICLE SERVICE

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POWER STEERING

37A-21

9. If the measured value is smaller than the standard value,

disassemble and assemble the steering gear, and if it is
larger than the standard value, disassemble and assemble
the oil pump flow control valve, and then measure oil
pressure again.

10.Remove special tools MB991548, MB990662 and

MB991549, and then tighten the pressure hose to the
specified torque.

Tightening torque: 57

± 7 N⋅m (42 ± 5 ft-lb)

11.Bleed the system.

POWER STEERING PRESSURE SWITCH CHECK

M1372007200249

Required Special Tools:

• MB990662: Pressure Gauge

• MB991548: Power Steering Oil Pressure Gauge Adapter

(Pump Side)

• MB991549: Power Steering Oil Pressure Gauge Adapter

(Hose Side)

1. Disconnect the pressure hose from the oil pump, and then

connect special tools MB991548, MB990662 and
MB991549.

2. Bleed air, and 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 (122 - 140°F).

3. The engine should be idling.
4. Disconnect the connector for the oil pressure switch, and

place an ohmmeter at the switch.

5. Gradually close the shut-off valve of the pressure gauge and

increase the hydraulic pressure, then check whether or not
the hydraulic pressure that activates the switch is the
standard value.

Standard value: 1.5

− 2.0 MPa (217 − 290 psi)

6. Gradually open the shut-off valve and reduce the hydraulic

pressure; then check whether or not the hydraulic pressure
that deactivates the switch is the standard value.

Standard value: 1.5

− 2.0 MPa (217 − 290 psi)

7. Remove special tools MB991548, MB990662 and

MB991549, and then tighten the pressure hose to the
specified torque.

Tightening torque: 57

± 7 N⋅m (42 ± 5 ft-lb)

8. Bleed the system.

ACX01134 AB

THERMO-
METER

ADAPTER
(MB991548)

RESERVOIR

OIL
PUMP

ADAPTER
(MB991549)

SHUT-OFF
VALVE

PRESSURE
GAUGE
(MB990662)

ON-VEHICLE SERVICE

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POWER STEERING

37A-22

BALL JOINT DUST COVER INSPECTION

M1372008600206

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.