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Relief Pressure Test (All Others)

  1. Close shut-off valve completely 3 times. Record highest pressure attained each time.
    CAUTION: DO NOT  leave shut-off valve closed more 5 seconds as this could damage the pump.
  2. If recorded pressures are within specifications and range of readings are within 50 psi (345 kPa), pump is working properly. See the POWER STEERING PUMP PRESSURE TEST SPECIFICATIONS  table. If recorded pressures are high but do not repeat within the 50 psi (345 kPa) range, flow control valve in pump is sticking. For power steering pump applications, see POWER STEERING PUMP APPLICATION  table.
  3. On ZF pump, replace pump. On Saginaw pump, remove and inspect flow control valve. For removal and disassembly, Refer to the POWER STEERING PUMP - SAGINAW & ZF article. On Saginaw pump, if recorded pressures are constant but less than specified, clean or replace pressure relief and flow control valve assembly. For removal and disassembly, see POWER STEERING PUMP - SAGINAW & ZF article.
    POWER STEERING PUMP APPLICATION

    Models Pump Type
    Acclaim, Daytona, Horizon, LeBaron, Omni & Spirit Saginaw
    Dynasty & New Yorker
    2.5 & 3.0L Saginaw
    3.3L ZF
    Fifth Avenue & Imperial (3.3L) ZF
    Shadow & Sundance ZF
    CAUTION: To prevent scrubbing flat spots on tires, DO NOT  turn steering wheel more than 5 times without rolling vehicle.
  4. If pressures are still low, overhaul or replace pump. On ZF pump, replace pump. If pump pressures are within specifications, leave shut-off valve open and turn steering wheel from stop-to-stop, with engine idling. Record highest pressure attained at each wheel stop and compare readings with maximum pump pressure previously recorded.
  5. If this pressure cannot build up in either side of gear, gear is leaking internally and must be disassembled and repaired. For removal and disassembly, see POWER STEERING PUMP - SAGINAW & ZF article.
POWER STEERING PUMP PRESSURE TEST SPECIFICATIONS

Application Pressure: psi (kg/cm2 )
Idle Pressure
Laser & Talon 114-142 (8-10)
Monaco & Premier 145 (10)
All Others 30-50 (2-3)
Relief Pressure
Laser & Talon 1067-1166 (75-82)
Monaco & Premier 1150-1170 (81-82)
All Others (1)
(1) Information not available from manufacturer.
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