TRACKMASTER Ch. 10 Removal and Replacement of Components
317-160-406 Rev 4 TMX428 TMX428CP & TMX58 Service Manual 97
May 2021
Running Belt Replacement TMX428 Series
Tools Required
¼” Allen wrench or socket
3/16” Allen wrench or socket
½” Wrench or socket with extension
Jack stand or block capable of supporting the weight of the rear of the treadmill
Approximate Time to Complete – 1 hr 30 min
1. Elevate treadmill to 12%.
2. Turn treadmill main power switch to the OFF position.
3. Unplug treadmill plug from the wall receptacle.
4. Allow treadmill to discharge for 3 minutes.
5. Remove the (5) hood securing bolts.
6. Set hood to the side of treadmill.
7. Lift rear of the treadmill and place jack stands or block to support the rear of the treadmill.
8. Use the 3/16” Allen wrench or socket to remove the bolt securing the left and right end caps from
the rear of the treadmill.
9. Remove the end caps and place to the side.
10. Use a ¼” Allen wrench or socket to completely remove left and right tension bolts from rear roller.
When removing the tension bolts maintain equal tension on the bolts to avoid stripping the threads
on the tension bolt or roller.
11. Push rear roller forward as far as it will go.
12. Lift the edge of the running belt up, use 3/16” Allen wrench or socket and remove the (4) flat head
Allen screws which secure the running deck cross braces. There are (4) screws total, (2) on the left
side and (2) on the right side.
13. Push the deck to one side of the treadmill and from the other side lift the edge of the deck up and out
over the rail; place deck to the side
14. Use a ¼” Allen wrench or socket to remove bolt securing the front roller to the treadmill frame.
15. Push the front roller from the right side of the treadmill to the left side and lift roller up and slip
timing belt off the front roller. Lift the front roller up and out of the treadmill. Use caution to avoid
pinching the belt.
16. Slide the rear roller out of the rear of the treadmill side rails and remove from the treadmill.
17. Use ½” wrench or socket with extension to remove the (4) bolts securing the deck cross braces to
the treadmill side channels. Remove the cross braces from the treadmill. Use caution to avoid
damage to the antistatic tinsel run between the (2) front bolts. Set the cross braces and the tinsel off
to the side. Verify all pieces of the deck cushions are accounted for and set off to the side.
18. Remove old running belt and replace with new running belt. Verify the guide for the belt deck and
rollers is to the left during installation.
19. Replace the (2) deck braces and deck cushions; start the deck braces securing bolts but do not
tighten them. Replace the antistatic tinsel using the (2) from deck brace bolts.
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