Hydraulic System Pressure Test
- Connect a pressure gauge between steering pump and steering gear. See Fig 1 . Bleed any air from system.
- Open valve on gauge, start engine and turn steering wheel back and forth to increase fluid temperature. To measure fluid pressure generated by the oil pump, completely close the gauge valve for 15 seconds and increase engine speed to 1,000-1,500 RPM.NOTE: Leaving gauge valve closed for more than 15 seconds will increase fluid temperature and could adversely affect the oil pump.
- To measure the fluid pressure generated at the gear housing, first open the gauge valve completely, increase engine speed to 1,000-1,500 RPM and turn steering wheel all the way to the left and right. Do not keep steering wheel fully turned for more than 10 seconds. The correct gear housing fluid pressure limit is 924 psi (6,500 kpa) at a temperature of 122-140°F (50-60°C).
- If the oil pump must be replaced, replace it as a complete assembly.