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Checking Pump Pressure

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  1. Close valve (A) and open valve (B). See Fig 1.
  2. Start engine. Ensure correct hydraulic fluid level in tank.
  3. Heat hydraulic fluid to approximately 122° F (50° C) by moving steering wheel at increased engine speed.
  4. Close valve (B) for a maximum 10 seconds and read off pressure. If pressure exceeds 1595 psi (110-120 bar) by more than 10 percent replace vane pump. If pressure is 10 percent less than 1595 psi 1595 psi (110-120 bar), check ribbed V-belt tension. If tension is OK, replace vane pump.
  5. Connect pressure line after removing special tool. Tighten to specification. See TORQUE SPECIFICATIONS .
  6. Bleed hydraulic system. See BLEEDING POWER STEERING SYSTEM .
Fig 1: Checking Vane Pump
G00177883Courtesy of BMW OF NORTH AMERICA, INC.
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