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Hydraulic System Pressure Test

  1. Check Power Steering (PS) belt to ensure it is in good condition and adjusted properly. Connect pressure gauge hose from PS flow/pressure test gauge to Tube (6865). Connect Adapter (6826) to valve end of PS flow/pressure test gauge.
  2. Disconnect high pressure hose at PS pump. Keep hose end raised to prevent fluid loss. Use container for dripping fluid. Connect Tube (6865) to PS pump hose fitting. Connect PS hose from steering gear to Adapter (6826). Open test valve completely.
  3. Start engine and let idle long enough to circulate PS fluid through PS flow/pressure test gauge, and to get air out of fluid. Shut off engine. Check fluid level. Add fluid as necessary.
  4. Start engine again and let idle. PS test gauge should read less than 125 psi (8.8 kg/cm2 ). If gauge reads greater than specified, inspect hoses for restrictions and repair as necessary. Initial pressure reading should be in range of 50-80 psi (3.5-5.6 kg/cm2 ). Increase engine speed to 1500 RPM and read flow meter. Reading should be 2.4-2.8 GPM (9.1-10.6 LPM). If reading is less than specification, PS pump should be replaced. See BELT TENSION SPECIFICATIONS .
    5. CAUTION: Next step involves testing maximum PS pump pressure output and flow control valve operation. DO NOT leave valve closed for more than three seconds, as pump could be damaged.
  5. Close valve fully three times and record highest pressure indicated each time. All three readings must be above specifications and within 50 psi (3.5 kg/cm2 ) of each other. See BELT TENSION SPECIFICATIONS . If pressure readings are above specifications but not within 50 psi (3.5 kg/cm2 ) of each other, replace pump. If readings are within 50 psi (3.5 kg/cm2 ) of each other but below specifications, replace pump.
    6. CAUTION: Do not force pump to operate against stops for more than 2 to 3 seconds, or pump damage will result.
  6. Open test valve, turn steering wheel to extreme left and right positions against stops. Record highest indicated pressure at each position. Compare reading to specifications. If highest output pressure is equal against either stop, gear is leaking internally and must be repaired.
PRESSURE TEST SPECIFICATIONS

Application Idle Pressure psi (kg/cm2 ) Relief Pressure psi (kg/cm2 ) +/-50 (3.5)
All Models Less Than 125 (8.8) 1400 (98.4)
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