Needle Bar Pendulum Timing (Timing The Camstack) - Singer 5400 Series Service Manual

Service Manual
Check:
1-
Set the machine for zig-zag, maximum width.
2- Remove the presser foot.
3- With the presser bar in a raised position, hold a piece of paper in place over the needle plate, so
needle penetration may be observed.
4- Turn hand wheel toward the front of the machine.
5- As the needle is rising from the right perforation, the point of the needle should be moving to the left
lightly touching the edge of the paper without enlarging the hole and should reach its peak of ascent
slightly past center of the two extreme positions of the needle. (illustration A).
6- On the downward stroke, all lateral movement should cease when the needle point is 5,5 mm -
7,5 mm (.220" - .300") above the needle plate. The needle must return into the opposite hole .
precisely.
Adjustment:
1-
Remove the free arm extension table, tension assembly dial, the knobs of the zig-zag and needle
position levers and all covers (face plate, rear, bottom bed and front)
2- Rotate hand wheel toward the front of the machine to bring reference mark (C) on the camstack
opposite the follower (B) bring the needle to its lowest position in the left hand swing of zig-zag.
3- Loosen two camstack clamping screws (D).
4- Advance pendulum timing if needle begins its right to left movement too late by rotating camstack
(E) slightly to the right (clockwise). Retard pendulum timing if needle begings its right-to-left
movement too soon by rotating camstack (E) slightly to the left (counterclockwise).
5- Tighten one clamping screw (D) and recheck pendulum timing. Readjust if necessary.
6- If pendulum timing is correct, tighten both clamping screws (D) securely.
Rev. n .
o
MAY/00
Needle bar pendulum timing
67
P/N 357773-002