Life Fitness 4500HR Service Manual page 32

Life Fitness Model 4500HR Treadmill
How To ... REMOVE AND REPLACE DRIVE MOTOR
Tools Required: Phillips screwdriver, socket and ratchet set, hex key wrench set
Step 1
Turn the power OFF at the ON/OFF switch and then unplug the unit from the electrical outlet.
Step 2
Remove the VENT COVER. (See "How To...").
Step 3
Remove the MOTOR COVER. (See "How To...").
Step 4
Cut the WIRE TIE that secures the three DRIVE MOTOR ASSEMBLY lead wires and the SENSOR CABLE at the
MOTOR HOUSING. Note the location of this WIRE TIE for replacement later. Disconnect the three DRIVE
MOTOR lead wires from the MOTOR TERMINALS. Note lead wire positions for reference during installation.
(Orientation = Black, Green, Red, clockwise when facing FLYWHEEL).
Step 5
Detach the SENSOR CABLE from the black retaining clip (attached to the metal heat sink on the CONTROL
BOARD ASSEMBLY). Disconnect the SENSOR CABLE CONNECTOR from the CONTROL BOARD. Note the
orientation of the SENSOR CABLE CONNECTOR on the CONTROL BOARD for reference during installation.
Step 6
It will now be necessary to relieve the DRIVE MOTOR BELT tension by removing the LOCK NUT on the
TENSIONING BOLT located next to the LIFT ACTUATOR.
NOTE: IF A BELT TENSIONING GUAGE IS NOT AVAILABLE, MARK THE CURRENT SETTING OF THE
TENSIONING BOLT BY LOCATING A PIECE OF TAPE ON THE BOLT AGAINST THE BRACKET ON
THE OPPOSITE SIDE OF THE LOCK NUT. ALSO, COUNT AND NOTE THE NUMBER OF TURNS
REQUIRED TO REMOVE THE LOCK NUT. THIS WILL AID IN PROPERLY TENSIONING THE DRIVE
BELT DURING INSTALLATION.
Remove the 1/4-20 nylon-insert LOCK NUT from the TENSIONING BOLT. Pivot the MOTOR MOUNTING
BRACKET rearward and remove the DRIVE MOTOR BELT from the MOTOR PULLEY.
(Continued)
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