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Power Steering Gear Box: Disassembly

  1. Loosen adjusting lock nut and remove. Remove side cover bolts and screw in the adjusting bolt 2 or 3 turns. With gear in neutral position, tap bottom of cross shaft with plastic hammer and remove.
  2. Remove valve housing locknut with spanner (MB990852 or equivalent).
  3. Place valve housing in vise and move rack-piston up and down to check backlash between circulator balls and rack-piston gutter. Turn the rack-piston fully into the valve housing and then loosen 2 turns to measure backlash. Service limit is 0.008" (.2 mm). If backlash exceeds limit, replace ball screw unit and rack-piston as an assembly.
  4. Remove rack-piston by turning counterclockwise. Do not lose circulator balls. Remove "O" ring, seal ring, steel ball, circulator and circulator holder from rack piston. Do not disconnect end cap. Remove thrust plate, needle roller bearings, seal rings and "O" rings from input worm unit and valve housing.
    Fig 1: Measuring Backlash Of Gutter And Ball. Service Limit 0.008" (.2 Mm)
    G09358373Courtesy of CHRYSLER GROUP, LLC
  5. Screw in adjuster bolt at tip of cross shaft and remove side cover. Remove "O" ring, bearing and adjusting plate. Do not remove bleeder plug unless necessary. Remove seal ring and "O" ring from valve housing. Remove bearing and oil seal from top cover. Remove oil seal and seal ring from gear box.
    NOTE: Replace all "O" rings, seal rings and oil seals once they have been removed. When replacing, lubricate with power steering fluid before insertion.
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