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Hydraulic System Pressure Test

  1. Remove pump reservoir cover and draw off fluid with syringe. Remove high pressure hose from pump. Connect High Pressure Tester (124-589-06-21-00 ) and Adapter Kit (201-589-02-63-00 for 190E, 300E, 300SD and 300SE, or 124-589-19-63-00 for 400E, 400SEL, 500E and 500SEL) in line between pump and high pressure hose. Fill reservoir to cast-in mark.
  2. With engine idling and tester valve open, measure circulating pressure. DO NOT turn steering wheel during measurement. Pressure should NOT be greater than 73 psi (5.13 kg/cm2 ).
  3. Raise engine speed to 1000 RPM. Close tester valve for maximum of 5 seconds to measure maximum pressure. See POWER STEERING PUMP MAXIMUM PRESSURE  table. If pump maximum pressure is not as specified, rebuild or replace pump assembly.
POWER STEERING PUMP MAXIMUM PRESSURE

Model psi (kg/cm2 )
300E,300CE, 300TE 1305-1450 (92-102)
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