Singer Centurion 121D200A - Page 33

ASSEMBLY SEQUENCE
ARM SHAFT
1. Insert arm shaft from left to right into arm casting with counterweight, intermediate
bearing assembly, bobbin winder drive wheel and timing belt pulley mounted to it as
shown.
2. With soft-faced mallet, lightly tap arm shaft from left to right until front arm shaft bear
ing is properly seated in casting.
3. Centralize intermediate bearing assembly in its housing and lock in place.
4. Rotate shaft to expose flats. Position counterweight and timing belt pulley over flats.
Tighten first set screw in direction of machine rotation onto flats of shaft to lock in
place.
5. Position bobbin winder drive wheei and tighten set screws.
6. Assemble timing belt and hand wheel. Tighten all remaining set screws.
Counterweight
Front Arm
Shaft Bearing
Arm Shaft
Bobbin Winder
Drive Wheel
Intermediate
Bearing
32
Timing Beit
Puiiey
Hand Wheei
From the library of: Superior Sewing Machine & Supply LLC