1. To avoid such problems, use a belt of an appropriate length as
specified in the INSTRUCTION MANUAL.
2. Adjust the belt tension using nut ❶ so that the middle of the
belt slacks about 18 mm when a 9.8N (1kgf) pressure is
applied.
c
An
excessive
belt
tension
may
damage the main shaft bushing
of the machine or the motor
bearing.
c
An insufficient belt tension may
cause the belt to slip with
consequent shortened life of the
belt, and also cause other failures
such as overrun after thread
trimming and machine stops with
uneven needle stop height.
Adjustment Procedure Results of Improper Adjustment
− 7 −
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