Horizontal Arm Shall - Singer 250 Series Service Manual

II
Horizontal Arm Shaft
Removal:
1) Removellll
,D
.n .u
.1111 . D. lfl
and
m .
2) Loosen screw A by approximately 4 Jurns.
3) Turn shaft until gear set screw 8 appears and loosen it approx. 4 turns.
4) Pull shaft D carefully to the left. removing to the right feed fork cam E and spacer F.
5) Remove shaft D.
6) Lift up connect ing rod C and remove carefully conical gear with eccentric G to the left. (Caution .
it may be necessary to screw back in set screw 8 to avoid scratching bearing surface of
connecting rod
CJ .
Caution on reassembly:
a) Position gear with eccenter G so that screw 8 is up over the slot in arm shaft D correspond ing
to hole H in counterweight J when hole H is up as shown in figure K.
b) Adjust the gear mesh with eccenlt,c G so there is not play between arm shaft gear and ver-
tical shaft gear. before tightening screw 8 .
c) Check hook timing as explained inll:J .
FORM 723 (1172)
37