Singer 620 - Positioning Hook to Needle

To Position Hook to or from Needle
Set needle bar at correct height, and time the
hook as previously instructed.
Turn hand wheel until point of hook is directly
behind needle. When correctly set, the distance be¬
tween the needle and hook-point should be approx¬
imately 0.004 inch, as illustrated.
HOOK
POINT
SETTING: With bobbin push-button in winding
position, remove locator nut by turning in a CLOCK¬
WISE direction. Remove bobbin push-button assembly
(see instructions on poge 9), and remove locator.
Careful ly mark the two bevel gears, as illustrated,
to assure proper meshing of gears when replacing.
Then loosen set screw in vertical hook-shaft bevel-
gear and remove gear from shaft.
Loosen set screw holding the eccentric bushing.
Turn the eccentric bushing while maintaining posi¬
tion of hook, until correct distance between needle
and point of hook is attained.
Replace bevel-gear using the previously-made
guide marks to assure correct meshing of gears.
Replace all other parts in reverseorder instructed
for removal. Set winding mechanism as instructed
on page 9.
CAUTION: Check for binding or end play in hook
dri ving-s haft. F or adjustment and removal, see page
24 of Service Manual for 600 and 603 Machines, and
page 6 of this supplement for removal of hook.
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