Singer 620 - Page 18

CAM STACK (Cont’d.)
Cam-Selector-Arm Shaft Return-Spring
Removal and Replacement
CLASS 620, 625 and 628 MACHINES:
To remove front selector-arm return-spring, follow
procedure described above for removal of cam-selec¬
tor-arm shaft down to withdrawal of shaft from rear
of machine.
As shaft is withdrawn, the tension-type return¬
spring can be lifted from between front and rear disc-
selector-arm brackets.
To replace, insert new return-spring between front
and rear disc-selector-arm brackets, slide shaft for¬
ward to engage spring, and reassemble cam-selector-
arm shaft and follower as described.
To remove rear selector-arm return-spring, follow
procedure described above for removal of cam-seiee-
tor-arm shaft down to removal of selector arms from
machine. This procedure releases coil-type rear re¬
turn-spring.
To replace, fit new return-spring on shaft and
reassemble cam-selector-arm shaft and followers as
described above.
Check ana adiust *he -eiecse mechanism as de¬
ar cec on cage '4.
CLASS 626 MACHINES
To remove selector-arm return-spring, follow pro¬
cedure described above for removal of cam-selector-
arm shaft down to withdrawal of shaft from rear of
machine,
As shaft is withdrawn, the tension-type return
soring can be lifted from the shaft between the legs
of the selector-arm bracket.
To replace, fit new return-spring on shaft and
reassemble cam-selector-arm shaft and follower as
described above,
Check and adjust the release mechanism as in¬
structed on page 14.
PRONT RETURN SPRING
620, 625 :na 623 Mac nines
REAR STOP BUSHING (SPLIT)
626 Machines
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