Singer 628 - The Rotating Hook; Removal and Replacement

THE ROTATING HOOK
VERTICAL GEAR
Removal
CAUTION: Hook-shaft gears and hand-wheel gea»
may be removed to facilitate adjustments. DO NOT
DISTURB THE MESH OF ANY OTHER GEAR IN
THIS MACHINE. All other gears are mated and cor¬
rectly timed. Replacements should be made only at
the factory.
Remove needle, presser foot, throat plate, bed
slide, bobbin case, feed dog, cushion-spring bracket,
and position finger.
Remove bed cover.
Remove feed-1 iftinq rock-shaft and feed rock-
shaft with pull-off finger as instructed on page 25,
Service Manual for Classes 600 and 603 Machines.
Remove actuating lever and bobbin driver as in¬
structed on page 9.
With chalk or crayon, mark the two bevel gears
as illustrated. (Mark one tooth of one gear, and the
corresponding space for that tooth in the other gear.)
This assures proper mesh when replacing.
Loosen set screw in vertical bevel gear, and re¬
move gear from hook shaft.
Lift rotating hook assembly from machine.
Replacement
InstalI rotating-hook assembly into machine. Using
the guide marks previous ly made, mesh vertical bevel
gear with horizontal bevel gear. Turn vertical hook-
shaft until flat side of shaft is under set screw in
bevel gear, and tighten set screw securelv.
Replace bobbin driver and actuating lever, as
instructed on page 9.
Insert pull-off finger into machine and reoiace
feed rock-shaft and feed-lifting rock-shatt as in¬
structed on page 25, Service Manual for v-lasses 600
and 603 Machines
Check and adjust hook as instructed on pages
7 and 3.
Replace all other parts previously instructed for
removal, except in reverse order.
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