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Hydraulic System Pressure Test

  1. 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.
  2. With engine idling and fluid hot, record pressure and flow rate with tester valve open. If flow rate is less than 1.6 gals. (6.1L) per minute, pump may require service; however, proceed with testing at this point.
  3. 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 rate. If flow rate is less than 1.7 gals./min. @ 740 psi (6.6L/min. @ 52 kg/cm2 ), replace power steering pump.
  4. 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 (84 kg/cm2 ), replace power steering pump.
  5. Increase engine speed to about 1500 RPM. Observe and record flow rate. If flow exceeds 1 gal./min. (3.78L/min.), replace power steering pump.
  6. Return engine to idle speed. Turn wheel from stop to stop. Observe and record flow rate at both stops. Pressure should be 1200-1380 psi (84-97 kg/cm2 ). Flow rate should drop to less than .5 gal./min (1.9L/min). If pressure fails to reach maximum or if flow rate does not drop to less than .5 gal./min (1.9L/min), internal leakage of steering gear exists. Replace steering gear. See STEERING GEAR  under REMOVAL & INSTALLATION.
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