TM 10-3530-207-14
5-61. BUTTON SEWING MACHINE ECCENTRIC, DRIVE SHAFT, LOOPER CAM AND CRANK
MAINTENANCE-continued.
Installation.
(1) Slide thread bushing (1) and thread loop gear (2) onto the thread loop shaft (3).
(2) Locate large end on holes in the thread loop gear (2) and the thread loop shaft (3). Line up large end
of tapered holes and drive thread looper pin (4) through parts.
(3) Install thread loop shaft (3), thread bushing (1) and thread loop gear (2) into machine head. Slide
thread bushing (1) until the front [opposite of the thread loop gear (2)] side is flushed with machine.
NOTE
If gear (14) does not clear gear (2), rotate bushing (1) until it does clear.
(4) Slide drive shaft (10) from rear side of machine head through thread tension cam (11), needle
eccentric (12), drive worm gear (13), and pulley shaft gear (14).
(5) Line up large end of tapered holes in the needle eccentric (12) and drive shaft (10). Drive pin (15)
through large end of holes. Tighten setscrew (16).
(6) Repeat step 2 with drive worm gear (13) and worm gear pin (17).
(7) Repeat step 2 with pulley shaft gear (14) and gear pin (18).
(8) Slide thread tension cam (11) against machine head Install and tighten two setscrews (19).
(9) Rotate thread bushing (6) so that thread loop gear (2) engages with pulley shaft gear (14).
(10) Tighten clampscrew (5).
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