SINGER 251 - Manual (Page 42)

42
THE ARM SHAFT
T4
Fig. 67. Loosening the Feed Eccentric
REMOVAL-
(See Figs. 67 to 69)
7. Loosen the four screws in the arm top cover and
remove the arm top cover.
1. Remove the face plate.
2. Remove the arm side shield and wick and the
thread take-up oil guard, as instructed on
page 36.
3. Remove the needle bar, upper needle bar bush­
ing, presser foot and presser bar, as instructed on
page 33.
8. Remove the oil lead that is fastened to the casting
just beneath the arm top cover.
9. Remove the feed timing screw Y, Fig. 67 and
loosen the set screw O, Fig. 67, in the feed-lifting-
eccentric-and-bevel-gear, X3, Fig. 67.
10. Remove the timing screw Z and loosen set screws
in the feed eccentric U4, Fig. 67.
4. Remove entire thread take-up lever assembly, as
instructed on page 34.
11. Remove arm shaft screw R4, Fig, 67 from ma­
chine pulley end of arm shaft.
5. Remove the oil-removing wick, as instructed on
pages 38 and 39.
12. Loosen the two set screws T4, Fig. 67 and remove
the machine pulley.
6. Set the machine at any stitch length except the
longest or the shortest (see instructions on
page 16) to prevent binding of the arm shaft
during removal and replacement.
13. Turn the needle bar crank until it is in the position
shown at M4, Fig. 69, to prevent crank from dis­
turbing the three wick loops in holder W4, Fig. 69
during removal of arm shaft.