JUKI MOL-254 Engineer's Manual page 115

Adjustment Procedures
1. Loosen the fixing screws in the motor installing base and
stretch the belt with belt tension adjustment screw
2. Check that the belt tension is adjusted so that the belt
sags approximately 4.6 mm when the center is pressed
with 3.92 N.
Results of Improper Adjustment
○ I f t h e b e l t i s e x c e s s i v e l y
.
○ If the belt is insufficiently
108
− −
stretched, the service life of belt
will be deteriorated or driving
torque will occur.
stretched, tooth skipping of belt
will occur.