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11. Tension of timing belt
Note: This checking is needed before and after adjusting “Needle timing to shuttle”.
1. Timing belt is engaged with gears on main and lower shafts.
Too weak tension may result in slippage between shuttle gear and lower shaft
gear due to thread jamming, bunching and fabric snagging.
Too strong tension may result in incorrect operation due to increased machine
torque.
2. Loosen screw (A) on arm frame for idler pulley (B) and shift the position of
idler pulley (B) for adjustment.
3. After adjustment, tighten screw (A) securely.
Note: Be sure to recheck “Needle Timing to shuttle” after adjustment.
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