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Singer 620 Service Manual page 13

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RemovaI
Remove top cover.
Remove tension stud.
Remove two screws holding front stop, and selec¬
tor mechanism assembly.
Remove the front stop.
Disengage tension-arm spring from selector mech¬
anism.
Remove selector mechanism assembly.
Replacement
Replace
selector
mechanism
assembly
in
the
machine, fastening it in place with the left screw.
Place the front stop on top of the mounting brack¬
et, and fasten it with the right screw.
Place tension arm over stud hole, being sure that
the arm is behind the arm plate.
In sert tens ion stud.
Loosen
the left and right
screws
(which were
tightened previously on selector assembly and front
stop),
and set the bracket parallel
with
the cross
shaft until the right edge of the bracket is approxi¬
mately
L 16" to 3/32" from the cast boss for the
cross-shaft bearing.
Then re-tignten screws.
Engage
driving
spring,
being
sure
that tail
of
spring is up when put into place on release lever.
Again, loosen right screw of mounting bracket and
set stop to limit travel of selector arm (This is done
to prevent disengagement of the selector arm and the
follower, and yet give free movement to the selector
arm when selecting patterns.)
Replace top cover.
12

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