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1.Disconnect the pressure
hose from the oil pump, and then connect following special
tools.
- Power steering oil pressure gauge
(MB990662)
- Power steering oil pressure gauge adapter (pump
side) (MB991548)
- Power steering oil pressure gauge adapter (hose
side) (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. 3.Start the engine and allow it to
idle.
caution |
The pressure gauge shut-off
valve must not remain closed for more than 10
seconds.
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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: 7.8 - 8.3
MPa <Petrol powered vehicle> 8.5 -
9.0 MPa <Diesel powered
vehicle> 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: 0.5 MPa 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: 7.8 - 8.3 MPa
<Petrol powered vehicle> 8.5 - 9.0
MPa <Diesel powered
vehicle> 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.
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