SINGER 251 - Manual (Page 34)

34
TO REMOVE THE NEEDLE THREAD TAKE-UP
H3
DO NOT
DISTURB
DO NOT
DISTURB U2
Fig. 52. Removing Needle Thread Take-up Fig. 53. Needle Bar Crank
Remove needle thread take-up in the following man­
ner:—
1. Remove face plate and arm hole plug A3, Fig. 53
from machine.
2. Remove needle bar, upper needle bar bushing,
presser bar pressure regulating thumb screw X2,
Fig. 51, page 33, and guide bracket T, Fig. 52 as
instructed on page 35.
3. Turn machine pulley as required to reach screw
Y2, Fig. 53, in needle bar crank through hole left
by removal of plug A3. Loosen set screw Y2.
4. Using wrench 146057 (through same hole) and
turning machine pulley as required, loosen the
large hexagon head clamping screw Z2, Fig. 53,
on needle bar crank.
CAUTION: DO NOT DISTURB the smaller hexagon head
position screw U2, Fig. 53, which holds the needle bar
crank at its correct position on the horizontal arm shaft.
5. Loosen small set screw B3, Fig. 52 in the rear of
the arm of the machine.
6. Insert a face plate screw E3, Fig. 52. in the tapped
hole in center of stud C3, Fig. 52 and, while hold­
ing back the needle thread take-up link inside
the head at G3, Fig. 52, pull upon the screw E3
until the stud C3 is removed. Remove face plate
screw from stud.
NOTE: Extractor Tool Serial 222226 may be used in­
stead of face plate screw at E3, Fig. 52, to pull hinge
stud C3.
7. Back the end of the take-up H3, Fig. 52 toward
the inside of the machine, turning the machine
pulley as required until the take-up is free of the
slot provided for it.
8. The needle thread take-up link assembly (includ­
ing parts F3, G3, H3, J3, Z3 and W4) can now be
pulled free of the needle bar crank WITHOUT
DISTURBING THE NEEDLE BEARINGS WITHIN THE
THREAD TAKE-UP CRANK AT F3, Fig. 53.
NOTE: If the needle bearings at F3, Fig, 53, are acci­
dentally disturbed, they must be reassembled so that
there are exactly 18 bearings in each of the two as­
semblies.