Fig. 13.7. Connecting measuring instruments when checking the pressure of the hydraulic power steering pump: 1 – thermometer; 2 – adapter MV990993; 3 – pressure relief hose; 4 – pressure gauge МВ990662; 5 – shut-off valve; 6 – adapter MV990994; 7 – high pressure hose; 8 – pump; 9 – tank
1. Disconnect the high pressure hose from the power steering pump and connect the measuring instruments (Fig. 13.7).
2. Remove air from the hydraulic system and then, with the vehicle stationary, turn the steering wheel several times until the temperature of the working fluid rises to 50–60°C.
3. Start the engine and maintain the speed (1000±100) min⁻¹.
4. Completely close the shut-off valve on the pressure gauge and measure the maximum pressure generated by the power steering pump and check whether it corresponds to the nominal value. The nominal value is 9.8 MPa.
Caution! The shut-off valve should not be closed for more than 10 s.
5. If the maximum pressure does not correspond to the nominal pressure, the pump must be replaced.
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6. Check the pressure in the hydraulic system without load with the shut-off valve fully open. The nominal value is 0.3-0.8 MPa.
7. If the obtained pressure value does not correspond to the nominal one, then the cause of the malfunction should be sought in the steering mechanism or hydraulic system hoses.
8. Open the shut-off valve completely.
9. Turn the steering wheel to the left or right until it stops and measure the holding pressure. The nominal value is 9.8 MPa.
10. If the measured pressure does not correspond to the nominal, replace the steering gear and re-measure the pressure.
11. Disconnect the measuring instruments and tighten the hydraulic system hoses to a torque of 44 N·m.
12. Remove air from the hydraulic system.