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Customer Services Bulletin
CORE HEALTH & FITNESS LLC Page 1 of 3 637-4278 Rev: B
Stepmill Alternator Belt Alignment
Stairmaster Stepmills
This document explains how to properly align the alternator belt on the Stairmaster Stepmills
Please be aware of pinch points and take care to avoid injury while working inside of machines.
Tools:• 1/8” hex key• #3 metric hex key
1. Remove one of the stepshafts to gain access to the alternator and gearbox.
2. Check to ensure that the belt is not riding off to one side of alternator, it should be centered in the pulley grooves.
Customer Services Bulletin
CORE HEALTH & FITNESS LLC Page 2 of 3 637-4278 Rev: B
3. If the belt is mis-aligned you will see a large gap between the body of the gearbox and the gearbox pulley. The belt will also be stretched diagnally between the two pulleys.
4. A properly aligned belt will have a small or no gap between the body of the gearbox and the gearbox pulley and the belt will be stretched parallel between the two pulleys
5. If the belt is misaligned, use a 1/8” hex key to loosen the grub screw on the gearbox pulley. Once loose, the pulley can be moved laterally to align the pulleys.
Customer Services Bulletin
CORE HEALTH & FITNESS LLC Page 3 of 3 637-4278 Rev: B
6. To ensure alignment, insert a metric #3 hex key between the body of the gearbox and the gearbox pulley.
7. Push the gearbox pulley up against the #3 metric hex key so that the hex key is snug between the body of the gearbox and the gearbox pulley.
8. Once aligned, re-tighten grub screw on gearbox pulley.