Timing Belt Replacement
Timing Belt Replacement
1. Elevate treadmill to 15% incline and turn off power to the unit.
2. Using a Philips screwdriver, remove the motor hood (P1252).
3. Use a 5/16” Allen wrench to turn each rear roller tension bolt,
counterclockwise, 6-10 full turns to release running belt pressure.
4. Remove the left, front roller bolt using a 9/16” wrench or socket.
5. Loosen the right, front roller bolt far enough to disengage bolt threads from
the roller threads.
6. Press down on the right side of the front roller until it is free of the front
roller spacer (A1401).
7. Remove the roller spacer. Newer models have a nylon thrust bearing
(P2046) between the spacer and the extrusion. Then pull the bolt out of
the extrusion. Newer models have an additional nylon flange bushing
(P2045) inserted into the front roller bolt hole on the outside of the right
8. Lift the front roller back up slightly and slide to the right, into the extrusion
channel vacated by the spacer. This will create enough of a gap on the
left end of the front roller to remove your old belt.
9. Slide the old belt off the front roller pulley and the motor pulley.
10. Install your new belt around the two (2) pulleys.
11. Once the new timing belt is in place, slide the front roller to the left until the
threaded hole in the end of the roller shaft line up with the bolt hole for the
front roller in the left extrusion.
12. Insert the bolt and lock washer through the left extrusion and into the front
roller. Thread about ¾ of the bolt into the front roller.
13. On the right side, insert the bolt through the extrusion, and nylon flange
bushing (if applicable). On the inside of the extrusion, place nylon thrust
bearing (if it was originally equipped) onto bolt followed by the spacer.
14. Line the threaded hole in the right end of front roller with the bolt coming
through the spacer.
15. Thread the bolt into roller and then tighten both front roller bolts.
16. Restore power to the unit and tension the running belt according to the
“Treadmill Running Belt Tracking and Tensioning” procedure.
17. With the power off, check the drive belt tension. There should be
approximately 3/8” travel when pressing down on top of the belt to put belt
at its lowest position between the pulley, then hooking a finger below the
belt and pulling to its highest point. If this isn’t correct, loosen the nuts at
the base of the motor and the motor tension bracket.
18. Slide motor towards the front of the treadmill until the timing belt is taut
and the motor and front roller pulley are aligned.
19. Hold the motor in this position and slowly spin the flywheel to allow belt to
seat properly on the pulleys. (If slack develops, slide motor towards the
front of unit to take up slack created when the belt seated.)
20. Once this alignment has been done and the belt is taut, use a 9/16”
wrench and ratchet with 9/16” socket to tighten the motor bolts.
21. This action should create a little play in the timing belt. Once the motor
has been locked down, snug the nut on the motor tension bracket. The
belt should have approximately 3/8” travel when pushed down and then
pulled up on. If this is too tight or too loose, loosen motor and tension nuts
and move motor slightly forward or backwards and retighten nuts. Repeat
this procedure until the tension is correct.
22. Verify all nuts and bolts are tightened down.
23. Restore power and test operation of the treadmill.
24. Restore and fasten motor hood in place.
12-12-03 te
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