Hydraulic System Pressure Test
- Reservoir must be kept full and at normal operating temperature during testing. Connect Power Steering System Analyzer (014-00207) between pressure line and pump, with gauge between pump and tester valve. Start and idle engine for 2 minutes.
- With engine idling and fluid hot, record pressure and flow with tester valve open. If flow is less than 1.6 gals. (6.1L) per minute, pump may require service; however, proceed with testing at this point.
- If idle pressure is greater than 150 psi (10.5 kg/cm2 ), check hoses for restrictions. Partially close tester valve. Allow pressure to increase to 740 psi (52 kg/cm2 ). Record flow. If flow is less than 1.7 gal/min. 740 psi (6.6L/min. @ 5100 kPa), replace pump.
- Close and partially open tester valve 3 times. Tester valve must not remain closed more than 5 seconds. Observe and record pressure each time valve is closed. If readings differ more than 50 psi (3.5 kg/cm2 ), flow control valve may be sticking. If relief pressure (valve closed) is less than 1200 psi (9520 kPa), replace power steering pump.
- Increase engine speed to about 1500 RPM. Observe and record flow. If flow exceeds 1 gal/min. (3.78L/min.), replace power steering pump.
- Return engine to idle speed. Turn wheel from stop to stop. Observe and record flow at both stops. Pressure should be 1200-1380 psi (8275-9520 kPa). Flow should drop to less than .5 gal. (1.9L) per minute. If pressure fails to reach maximum or if flow does not drop to less than .5 gals. (1.9L) per minute, internal leakage of steering gear exists. Replace steering gear.