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Servo Balance Testing And Adjusting: Testing

  1. Connect a pressure gauge as shown in Fig 1 .  Make sure oil in reservoir is at level mark. Place pressure gauge so it can be seen from the drivers seat.
  2. Remove steering wheel impact guard by compressing sides slightly. Install a torque wrench on steering wheel nut.
  3. With engine at idle, turn steering wheel (using torque wrench) slowly to right. Read torque when pressure reaches 170 psi (12 kg/cm2 ) on cam gear type, 285 psi (20 kg/cm2 ) for ZF steering gear. Repeat operation turning wheel to left. Torque should be 30-40 INCH lbs. (3.4-4.5 N.m) as gear approaches specified pressure.
  4. Difference between sides must not exceed 8 INCH lbs. (.9 N.m) on cam gear type. Difference must not exceed 4.4 INCH lbs. (.5 N.m) on ZF steering gear. If difference exceeds this amount, cam gear type can be corrected following adjustment procedure.
    Fig 1: Pressure Gauge Test Set Up
    G09358418Courtesy of VOLVO CARS CORPORATION
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