Mitsubishi Montero (2004+). Manual — part 1157
ON-VEHICLE SERVICE
TSB Revision
POWER STEERING
37A-17
2. At a vehicle speed of approximately 35 km/h (22 mph), turn
the steering wheel 90 degree angle, hold a few seconds,
then release. If the steering wheel then returns 70 degree
angle 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 insuffi-
cient during idling.)
DRIVE BELT TENSION CHECK
M1372001900206
CAUTION
Perform the check after rotating the engine in the normal
direction (one revolution or more).
1. Check that the indicator mark of the auto-tensioner is
located between the marks shown as "A" on the tensioner
bracket.
2. If the mark is located out of the space "A," replace the drive
belt.
NOTE: Since the auto-tensioner is used, it is not necessary
to adjust the tension of the belt.
FLUID LEVEL CHECK
M1372002000228
1. Park the vehicle on a flat, level surface, start the engine, and
then turn the steering wheel in both directions several times
to raise the temperature of the fluid to approximately 50
−
60
°C (122 − 140°F).
2. With the engine running, turn the wheel all the way to the left
and right several times.
3. Check the fluid in the oil reservoir for foaming or milkiness.
4. 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 (0.2 inch) or more, air bleeding should be
done.
ACX01130AB
70˚
70˚
ACX00751AB
INDICATOR MARK
A
ACX01131
WHILE ENGINE
RUNNING
WHILE ENGINE
STOPPED
AB
FLUID FLUCTUATION
ON-VEHICLE SERVICE
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POWER STEERING
37A-18
POWER STEERING FLUID REPLACEMENT
M1372002100258
1. Jack up the front wheels and support them.
2. Disconnect the return hose A connection. (Refer to
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,
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-19
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-20
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.
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.
ACX01134 AB
THERMO-
METER
ADAPTER
(MB991548)
RESERVOIR
OIL
PUMP
ADAPTER
(MB991549)
SHUT-OFF
VALVE
PRESSURE
GAUGE
(MB990662)
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