Removal and Replacement of Components
Ch. 10
TRACKMASTER
92
TMX428 TMX428CP & TMX58 Service Manual
317-160-406 Rev 4
May 2021
Drive Motor Replacement TMX428 Series
Tools Required
1/4” Hex Socket or Flat Blade Screw Driver
7/16” wrench and socket
9/16” wrench and socket
¾” wrench and socket
3/16” Hex wrench or Hex socket
3/32” Hex wrench or Hex socket
Approximate time to complete 1 hr 30 min
1.
Elevate the treadmill with test plug to approximately 15% grade.
2.
Turn the treadmill main power switch to the OFF position.
3.
Unplug the treadmill from the wall receptacle.
4.
Allow treadmill to discharge for 3 minutes.
5.
Remove the (5) hood securing screws.
6.
Remove hood and set aside.
7.
Remove Motor Feedback 6-pin cable on J1 from drive.
8.
Remove Motor Power 4-pin cable on TB2 from drive.
9.
With ¾” wrench and socket loosen spring tension, slide belt off the sprocket allowing the
motor to pivot, gaining access to the motor mount bolts.
10.
With ¼” hex socket or flat blade screw driver remove the (4) ¼” plastic clamps on the
Motor Feedback & Power wires.
11.
With 7/16” wrench and socket remove the 4 bolts securing the motor mount to the frame.
12.
Lift the motor assembly out of the treadmill.
13.
With 9/16” wrench and socket remove the pivot bolt.
14.
Remove drive sprocket from motor shaft by loosening the two 3/32” set screws on its
hub, then slide it off.
15.
Remove flywheel from motor shaft by loosening the two 3/16” set screws on its hub
then
slide it off.
16.
Slide the flywheel and 1/8” key on the new motor shaft; make sure the flywheel does not
rub the plastic housing creating a motor noise.
17.
Slide drive sprocket and 1/8” key on the motor shaft approximately in the same location
from old motor.
18.
Tighten the setscrews on the hub, set key setscrew first then the other one.
19.
Reinstall the new motor to existing motor base plate.
20.
Tighten the pivot bolt until free movement of the motor is removed.
21.
Reinstall motor, making sure the isolator mounts are in place.
22.
When tightening the 4 bolts, tighten equality without over tightening.
