Removal and Replacement of Components
Ch. 10
TRACKMASTER
102
TMX428 TMX428CP & TMX58 Service Manual
317-160-406 Rev 4
May 2021
Elevation Actuator Replacement/Adjustment TMX428 Series
Tools Required
Tape measure
1/4” Hex
Nut Driver
2 -
9/16”
Wrenches or Sockets
3/8”
Wide Flat Blade Screwdriver
Trackmaster Grease
“Part Number 317
-160-165
Shipping blanket, carpet, or cardboard
Approximate time to complete 1 hr 30 min
1.
Turn treadmill main power switch to the OFF position.
2.
Unplug treadmill plug from the wall receptacle.
3.
Allow treadmill to discharge for 3 minutes.
4.
Move the treadmill to an area large enough to lay treadmill on its side.
5.
Remove the (5) hood securing bolts.
6.
Set hood to the side of treadmill.
7.
Unplug the treadmill actuator harness (this is a six-conductor connector attached to the actuator).
8.
Cut the Zip tie that holds the wire to the motor pan gusset.
9.
With blanket in suitable spot, place a foot on the treadmill side channel and grasp the handrail; pull the
treadmill towards you and allow it to gently come to rest on its side.
10.
With the 9/16” wrench and socket remove the top and lower bolts from the a
ctuator.
11.
When removing the bolts from the actuator: watch out for nylon washers on each side of the actuator.
12.
Prior to installing the new actuator, preset the zero position. Looking from the bottom (tube end).
Lightly turn the tube clockwise until it bottoms the threads or stops, ensure that the motor shaft does
not turn! Now turn it counter clockwise a 1 1/2 turns and continue turning it until bolt holes in the tube
is aligned with holes as it is installed.
13.
Reverse procedure to install the actuator back into the treadmill. Be sure to use Trackmaster grease
(quality moly based grease) on both the bolts and nylon washers retaining it.
Note:
Over tightening the lower bolt will lead to a popping or creaking noise, as the treadmill is elevating.
14.
After installation, follow the calibration of grade using the grade recalibration instruction for your
model of treadmill, then check for proper operation.
Elevation
Assembly
Actuator Nut
Nylon Washer
Lower Actuator Bolt
Apply Trackmaster
Grease
Treadmill Frame
Actuator Bolt
Actuator Spacer
Washer
Nylon Washer “Apply Trackmaster
Grease to pivot”
Actuator
Actuator Nut
