How to Replace a Transmission on Stairmaster 4000PT

Learn how to replace a transmission on your Stairmaster 4000PT stepper.


  • Screwdriver
    • Phillips (units equipped with 1/4 turn fasteners)
    • Flathead (units equipped with stud assembly fasteners)



  1. Remove the side covers.
  2. Remove the Poly-V belt.
  3. Remove the drive chain.
  4. Support the transmission while removing the four mounting screws from the backside of the transmission.
  5. Installation is the reverse of removal.
  6. This completes a transmission replacement for the Stairmaster 4000PT.
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