TRACKMASTER
Ch. 10
Removal and Replacement of Components
317-160-406 Rev 4
TMX428 TMX428CP & TMX58 Service Manual
95
May 2021
Front Roller Replacement TMX428 Series
Tools Required
1/4” Hex Socket or Flat Blade Screw Driver
3/16” Hex Wrench or Hex Socket
Approximate time to complete 40 min
1.
Turn the treadmill main power switch to the OFF position.
2.
Unplug the treadmill from the wall receptacle.
3.
Allow treadmill to discharge for 3 minutes.
4.
Remove the (5) hood securing bolts.
5.
Remove hood and set aside.
6.
Use the 3/16” All
en wrench or socket to remove the button head Allen bolt securing the left
and right end caps from the rear of the treadmill.
7.
Remove the end caps and place to the side.
8.
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.
9.
Push rear roller forward as far as it will go.
10.
Use a ¼” Allen wrench or socket to remove the bolt securing the fr
ont roller to the treadmill
frame.
11.
Push the front roller from the right side of the treadmill to the left side and lift roller up; slip
timing belt off the front roller. Lift the front roller up and out of the treadmill. Use caution to
avoid pinching the timing belt.
12.
Slide the front roller between the running belt, place the timing belt over the sprocket of the
front roller between the running belt and place the timing belt over the sprocket of the front
roller. Replace the front roller. Verify the guide for the belt deck and rollers is to the left
during installation. Verify the timing belt goes around the front roller sprocket and that it
is not pinched.
13.
Replace the securing bolt and tighten.
14.
Align the bolt holes on the rear roller with the
access hole of the end caps. Start the
tensioning bolts on the rear roller but do not
tighten.
15.
Replace the left and right end caps and replace
securing screws.
16.
Adjust the tension of the running belt; see
Chapter 7 Drive Belt Tension Adjustment.
Front Roller
Flat Washer 5/16”
Lock Washer
5/16”
Bolt 5/16-
18 x 2” Lg
