Technical Procedure

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Stepmill Sprocket Alignment

8-G (9-5250) + Gauntlet (150015) + Legacy Stepmills

This document reviews the procedure for determining and correcting upper and lower sprocket alignment on the StairMaster Stepmill series.

Tools Needed:• 1/4” Allen Key Socket• Ratchet• Torque Wrench• Loctite 423

This guide begins after the shrouds have been removed.

Verifying Alignment

1. Rotate the machine’s steps and listen for any popping/clicking/scraping noises.

2. If there are noises similar to the ones described in Step 1, go to the “Sprocket Alignment” proce-dure.

3. Continue to rotate the machine steps, verify the step shaft bearings on both left and right side of the machine are traveling properly along the bearing plate. If the bearings are traveling off-center or contacting the bearing plate bolts, go to the “Sprocket Alignment” procedure.

Technical Procedure

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4. Verify that the step/step risers are not contacting the inner left or right shroud panels. If the steps are contacting the inner shroud panels, proceed to the “Sprocket Alignment” procedure.

5. Measure the distance from the outside face of the lower left sprocket to the outside edge of the frame. Compare this against the same measure-ment taken from the outside face of the lower right sprocket. The measurements should be even. Repeat this measurement comparison for the upper left and right sprocket faces

NOTE: The distance shown is only given as an example showing the location of the mea-surement

Verifying Pillow Block Set Screw Torque

1. Using a torque wrench and a 1/4” allen key socket, verify that the two (2) set screws located on the left and right lower pillow block bearings are torqued to 80 in-lb. Repeat this step for the left and right upper pillow block bearings. If the set screws need to be re-torqued, remove them, add a drop of Loctite 423 to the threads of each screw, then torque each screw to 80 in-lb.

Technical Procedure

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Sprocket Alignment Procedure

1. Remove the set screws from the lower left and right pillow block bearings, four (4) in total.

2. Move the sprocket laterally (left/right) until the distance between the frame and the face of the left and right sprockets are even.

3. Apply a drop of loctite 423 to each set screw’s threads then using a torque wrench and a 1/4” allen key socket, re-install the four (4) set screws and torque each set screw to 80 in-lb

4. Repeat Steps 1-3 for the upper sprocket.