INSTRUCTIONS
FOR
REMOVAL
AND
REPLACEMENT
OF
PRINCIPAL
ASSEMBLIES
CAUTION
TO
MECHANICS
Machines
of
Class
591 are made with extreme precisionin machiningand assembly,and the "Superfinish" process
provides
microscopically
smooth
bearing
surfaces.
Therefore,
special
careshould be taken not to permit any mis
alignment of parts or to
cause
any scratches or nicks on the
bearing
surfaces
by
careless
assembly
or handling of
parts. Anysuch
damage
mightrenderthe machine incapable of the long,trouble-free
service
for whichit is
designed.
TO
REMOVE
THE
SEWING
HOOK
I
NO.
143042
Fig.
14
Fig.
15
Remove the needle, slide plate, throat plate and bobbin case. Remove the screw R, Fig. 14 and the bobbin case
holder positionbracket S, Fig. 14.
Loosen
the two set
screws
L, Fig.14 in the hub of the hook and turn the
machine
pulley over toward the operator until the feed bar Q is raised to its highest point.
Turn the sewing hook until the thread guard U, is at the bottom, as shown in Fig. 15. Turn the bobbin case
holder V, Fig. 15 until the notch W isalso near the bottom, asshown in
Figs.
15 and 16. The
sewing
hook can then
be
removed
from
the
hook
shaft.
-8
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