Pressure Testing Power Steering SystemThe pump is tested by measuring its output pressure, as shown in Fig. 7-18. This test requires a pressure gauge with a minimum range of 0-100 bar (0-1500 psi) and a valve between the gauge and the pressure line to the steering gear. Connect the gauge, with the valve open, between the pump and the pressure hose. Center the steering. Start the engine and let it idle. To test the pump, close the valve on the gauge and quickly read the pressure. Then, open the valve. The pressure should be 76 to 82 bar (1102 to 1189 psi). If not, replace the pump.
To test system pressure, leave the gauge valve open and have a helper turn the steering wheel full right and full left. At each position, the pressure with the valve open should be 76 to 82 bar (1102 to 1189 psi). If not, the steering gear should be replaced.
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