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Home >> Mercedes Benz >> 1982 >> 300CD >> Repair and Diagnosis >> Steering >> Power Steering >> Power Steering - Power-Assisted Recirculating Ball >> Overhaul >> Power Steering Gear >> Disassembly
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Power Steering Gear: Disassembly

  1. Attach steering gear to an assembly plate (116 589 01 59 00). Remove lock nut from adjusting screw. Remove copper seal ring. Remove bolts attaching pitman shaft cover to steering case.
  2. With steering in center position, turn adjusting screw clockwise. This forces pitman shaft, with housing, from steering gear case. Remove pitman shaft with cover.
    Fig 1: Sectional View Of Adjusting Screw
    G09358571Courtesy of MERCEDES-BENZ USA

    To adjust, first center steering. 

  3. Remove "O" rings from cover. Remove lock ring and seal ring. Remove lock ring from pitman shaft. Remove adjusting screw with thrust washers. See  Fig 1 . 
  4. Remove bolts retaining bearing cap to steering gear case. Turn worm gear counterclockwise until bearing cap is forced out of steering gear case.
    NOTE: Balls will fall out of ball guide if worm gear is turned too far.
  5. Remove bearing cap and worm gear with piston/steering nut from steering gear case. Unscrew worm gear with bearing cap from piston/steering nut. Do not lose circulator balls.
  6. Remove "O" ring from bearing cap and attach bearing cap to an assembly fixture.
  7. Unscrew slotted nut, using hook wrench, from bearing insert. Remove bearing insert from bearing cap using spanner wrench. See  Fig 2 . 
    Fig 2: Removing Bearing Insert From Bearing Cap
    G09358572Courtesy of MERCEDES-BENZ USA

    Assembly must be held in a fixture. 

  8. Remove steering worm and washer from bearing cap. Remove roller cage from steering worm, along with seal and "O" rings.
  9. Remove bearing and disc from bearing cap. Remove bolts, clamp, and both ball guide halves from piston/steering nut.
    Fig 3: Removing Worm Gear Nut From Piston Nut
    G09358573Courtesy of MERCEDES-BENZ USA

    Clamp is held in vise. 

  10. Using clamp and tools, remove worm gear nut from piston/steering nut. See  Fig 3 .  Remove seal ring and "O" ring from worm gear nut.
  11. Remove bearings from piston/steering nut. Remove lock ring, cover and control valve from steering gear case. See  Fig 4 . 
    Fig 4: Cross Sectional View Of Steering Gear
    G09358574Courtesy of MERCEDES-BENZ USA
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