SINGER 251 - Manual (Page 43)

43
THE ARM SHAFT (continued)
Z 4
X 4
i
Fig. 68. Removing the Arm Shaft
REMOVAL (Continued)
CAUTION: The feed-timing-bevel-gears at S3, Fig. 68
have been lapped together at the factory and should
be kept in mesh (as instructed in Fig. 68) throughout
the removal and replacement of the arm shaft.
14. While maintaining needle bar crank M4 at posi­
tion shown in Fig. 69, hold these gears in mesh
by holding the blade of a large screwdriver be­
tween the arm casting and the feed eccentric U4,
as shown in Fig. 68; then push the end of the
arm shaft X4, Fig. 67 through the bushing Z4,
Fig. 67.
15. Using another shaft (or a drift pin of the same
diameter as the arm shaft on these machines),
push the arm shaft X4 further through the ma­
chine (still keeping the gears at S3 in mesh).
This temporary shaft must be pushed sufficiently
far into the machine to hold the entire gear and
feed eccentric mechanism in position upon it until
the new arm shaft is installed.
W4
Fig. 69. Position of Needle Bor
Crank, During Removal of Shaft
16. Finally grasp the needle-bar-crank-end of the
arm shaft firmly at the face plate end and pull
the arm shaft straight out of the machine.