Drive Motor Assembly - Life Fitness 4000 Service Manual

Life Fitness Model 4000 Treadmill
How To ... REMOVE AND REPLACE DRIVE MOTOR
( Continued )
Step 7
Remove the two DRIVE MOTOR ASSEMBLY mounting SCREWS securing the ASSEMBLY to the MOTOR
MOUNTING BRACKET by using a 1/4" hex wrench. Remove the DRIVE MOTOR ASSEMBLY from the unit.
Pivoting the MOTOR MOUNTING BRACKET may be required to remove the ASSEMBLY.
Step 8
Align the new DRIVE MOTOR ASSEMBLY with the MOTOR MOUNTING BRACKET. Locate the new DRIVE
MOTOR ASSEMBLY into position and secure IN PLACE with the two SCREWS. (Support the DRIVE MOTOR
ASSEMBLY with one hand beneath it while inserting the SCREWS with the other hand). Install the DRIVE
MOTOR BELT onto the DRIVE MOTOR PULLEY. Be sure the DRIVE BELT properly engages all ribs on both the
DRIVE MOTOR and the FRONT ROLLER PULLEYS.
Step 9
Check that the SHAFT KEY located on the DRIVE
MOTOR SHAFT is properly seated within one of the four
KEY slots in the PLASTIC FAN and that the PLASTIC
FAN rests against the shoulder in the MOTOR SHAFT.
Reposition the SHAFT KEY and FAN as required if they
are not properly aligned.
Step 10
Use a STRAIGHT-EDGE to align the flat sides of the
DRIVE MOTOR PULLEY and the FRONT ROLLER
PULLEY. The faces of the two PULLEYS should be in-
line (coplanar). If the PULLEYS are not aligned, loosen
the two SET SCREWS on the DRIVE MOTOR PULLEY
and adjust as necessary. Once aligned, recheck the
SHAFT KEY and PLASTIC FAN positions per Step 9
above and tighten the two DRIVE MOTOR PULLEY SET
SCREWS.
Step 11
Install the 1/4-20 nylon-insert LOCK NUT onto the
TENSIONING BOLT and, if available, use a belt tensioning gauge to tension the DRIVE MOTOR BELT to 100 lb
(+/- 5 lb).
Step 12
NOTE: IF A GAUGE IS NOT AVAILABLE, RE-INSTALL THE LOCK NUT BY TURNING IT THE SAME
NUMBER OF TIMES IT WAS TURNED ON REMOVAL. BE SURE THE TENSIONING BOLT IS POSITIONED
PROPERLY IN THE SLOT AT THE FRONT OF THE MOTOR HOUSING DURING TENSIONING.
Connect the three DRIVE MOTOR lead wires to the proper DRIVE MOTOR TERMINALS (See Step 4). Attach the
new SENSOR CABLE to the black retaining clip. Connect the SENSOR CABLE CONNECTOR to the CONTROL
BOARD terminal. Install a new WIRE TIE to secure the SENSOR CABLE and the three DRIVE MOTOR LEAD
WIRES in the same location from which the previous WIRE TIE was removed.
Step 13
Manually rotate the DRIVE MOTOR SHAFT. Check that all wiring is adequately dressed to clear rotating
components. Redress wiring if required.
Step 14
Reverse Steps 1 through 3 to return all parts to their proper positions.
18