OIL PUMP PRESSURE TEST

1.Disconnect the power steering oil pressure hose from the power steering oil pump (Refer to ), and then connect following special tools. Power steering oil pressure gauge (MB990662) Oil pressure gauge adapter A (pump side) (MB991548) Oil pressure gauge adapter B (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. 4.Fully close the shut-off valve of the pressure gauge and measure the power steering oil pump relief pressure to confirm that it is within the standard value range. Open it again immediately after checking the pressure. Standard value: 8.5 - 9.0 MPa 5.If it is not within the standard value, replace the power steering 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: 8.5 - 9.0 MPa 9.If not the standard value, overhaul the steering gear. Remeasure fluid pressure. 10. Remove the special tools, and then tighten the power steering oil pressure hose to the specified torque. Tightening torque: 57 ± 7 N·m 11. Bleed the system (Refer to ).