Component Tests and General Diagnostics

Opening Drag Check
(Motor Removed)

Before installing the motor, measure the effort required to open the glass using a spring scale as shown.

CAUTION: When using a spring scale, protect the leading edge of the glass with a shop towel.




If load is over 40 N (4 kgf, 9 lbf), check the side clearance and glass height.

Closing Force Check
(Motor Installed)

1. After installing all removed parts, have a helper hold the switch to close the glass while you measure the force required to stop it. Attach a spring scale as shown. Read the force as soon as the glass stops moving, then immediately release the switch and spring scale.






CAUTION: When using a spring scale, protect the leading edge of the glass with a shop towel.




2. If the force in not within specification, install a new lock washer, adjust the tension by turning the motor clutch adjusting nut, and bend the lock washer against the motor clutch adjusting nut.