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Checking Vane Pump

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  1. Detach pressure line from pump and connect special tool (32 4 000). See USING SPECIAL TOOL (32 4 000) .
  2. Close valve (A) and open valve (B). See Fig 1.
  3. Start engine. Ensure correct hydraulic fluid level in tank.
  4. Heat hydraulic fluid to approximately 122°F (50°C) by moving steering wheel at increased engine speed.
  5. 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 V belt tension. If V belt tension is OK, replace vane pump.
Fig 1: Checking Vane Pump
G00177883Courtesy of BMW OF NORTH AMERICA, INC.
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