5-15. CLOTHING SEWING MACHINE BOBBIN ASSEMBLY MAINTENANCE - continued.
Remove all buildups of grease, dirt, etc., by wiping with a wiping rag (Appendix F, Item 2).
Cleaning solvent, Federal Specification P-D-680, is both toxic and flammable. Keep off skin.
Use only in a well ventilated area and avoid prolonged breathing of vapors Keep away from open
Clean using cleaning solvent (Appendix F, Item 8) and either a wiping rag (Appendix F,
Item 2) or a medium bristle brush (Appendix F, Item 1).
Allow to dry.
Inspect hardware for damage
Inspect the rotary hook assembly for damage.
Repair. Repair of the bobbin assembly components is limited to the replacement of defective
Install shuttle hook (1), race ring
back (2), race back (3) and secure
with screw (4) on race body cap (5).
Install race ring (6) securing with
two screws (7).
Needle bar must be fully up.
Install race shuttle assembly (2)
and secure with two screws (1).