Troubleshooting TRACKMASTER
7. Remove the rear roller.
8. Remove the running board. (Follow the “Running Board Removal and Maintenance”
instructions on page 7-5.)
9. Remove the 5/16-in. bolts securing each crossbar to the mounts, and remove the
crossbars.
10. Install new running belt.
11. To reassemble, reverse the preceding steps.
12. When installing the front drive roller, ensure that the drive belt is properly located over
both sprockets.
13. After you have completed the installation, and before you tension the belt, make two
visible marks, 50 in. apart, on the belt (if such marks are not already present). Tighten
the rear roller take-up bolts evenly until the two marks are exactly 50-3/8 in. apart. This
will provide the 1% tension recommended by the belt manufacturer.
14. The running belt is now ready for tracking adjustment (see “Running Belt Adjustment”
on page 7-3).
Note: Depending on its use, the running belt will stretch slightly. When this happens,
you will feel the belt hesitate briefly at each foot strike. Adjust tension immediately if this
occurs. Turning both tension bolts one-half turn will usually provide the proper tension.
Do not overtighten the tension bolts. If it appears that the belt is near the proper tension,
make one-quarter turn adjustments.
Roller Removal
CAUTION Use only TRACKMASTER
®
replacement parts. Using other parts may void your warranty,
compromise the treadmill’s safety features, and cause your treadmill to malfunction.
Never stand rollers on end, because their weight could damage the roller bearings.
This procedure requires the following tools:
• 1/2-in. socket wrench
• 1/4-in. Allen wrench
• 1/4-in. nut driver
• 3/16-in. Allen wrench
8-2 TMX425 Series Owner’s Manual February 1, 2004
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