B. Instructions
for
Repair
1. Disassembly
Strip the
machine
only as far as is absolutely necessary for the repair job
intended. This rule applies particularly to dismantling the worm
gear
assem
bly.
All
major repair and
conversion
jobs
should
be performed at the
Pfaff
plant.
It is advisable to strip complete ossemblies
which
can be easily disassembled
and
reassembled as a unit. In
order
to avoid
that
screws will be misplaced
or get lost, replace them in the screwholes immediately after the respective
port has been
removed,
if not
morked
previously,
spot the
position
of
cranks
on shafts and the meshing teeth on both the worm and the worm wheel.
These
position
marks
greatly facilitate the assembly and adjustment of the
machine
later.
To dismantle the machine completely, strip the ports in the following se
quence (see illustrations on pages 24 through 29):
Needle, Work Clamp
and
Face Plate
Remove these ports first.
Stop Motion
Unscrew brake lever tension spring
(9624)
and boll joint connection
(22772).
Loosen
screw on stop motion lever hinge stud
(11126),
and push out this stud.
Strip both the stop motion and broke levers, and dismantle
locking
lever
(22530).
Front
Ports
Turn out needle
bar
frame set screw
(700073),
and loosen set screw
(700152)
on needle
bar
frame hinge stud.
Pull
needle bar frame and hinge stud out of
the machine cautiously. Dismantle presser bar
(6523)
with presser bar spring,
pressure regulating screw
(392),
presser bar lifting bracket
(22037),
and clamp
foot lifting lever
(22861).
Unscrew
thread wiper wire
(22104),
and strip
take-up
lever.
Feed
Cam
Unscrew wing nut
(701578)
on boll screw stud of boll joint connection
(22394),
loosen
binding
screw
(700297)
on bearing
bracket
(21060),
and
pull out feed across regulator
(22017).
Unscrew hexagon nut
(701638)
on worm
wheel shaft
(22009),
and
pull the feed cam off this shaft.
Knife
cam
Strip knife bar tripping lever
(22239)
and lifting lever guide
(22004).
Dis
mantle
lifting
lever and knife cam (cautiously drive toper pin out of knife
com
positioning
flange).
30
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