Pump Pressure Test
- With pressure gauge connected as shown in Figure, and engine at idle, turn steering wheel fully to left, then fully to right, pressing at end position for a maximum of 10 seconds. Correct pressure should be 895-995 psi (63-69 kg/cm2 ) for the Saginaw pump and 825 psi (58 kg/cm2 ) for the ZF pump.
- To test system maximum pressure, close pressure gauge valve and block oil flow for maximum of 10 seconds. If pressure does not reach the values in the proceeding paragraph, the pump is defective and must be repaired or replaced, see Overhaul in this article. NOTE: The manufacturer does not recommend repair of the Saginaw pump, replace if defective.