22
UPPER MAIN SHAFT (CONT.)
TO CHECK FOR ALIGNMENT
1.
Remove the presser bar spring, washer and regulator screw.
2.
Rotate the handwheel so that the needle bar is at the
bottom of its stroke. Loosen hexagonal head screw
on back of the presser bar roller bracket, and set
screw on left side or roller bracket. Then loosen screw
on presser bar guide and remove presser bar, presser
bar spring washer and presser bar guide.
3.
Remove the upper left plastic plug on the back of the
machine and loosen screw in plug hole. Remove
take-up lever pin. With light inward finger pressure,
move the take-up lever to the take-up lever boss.
There should be a small amount of interference be
tween the lever and the boss. With light outward
finger pressure, move the lever across the boss face.
There should be clearance between the boss face
and lever. These two tests, in effect, are checking
the lateral play of the take-up and provide for opera-
tion of the take-up in the center of the lateral play.
Now, line up the take-up lever hole in the lever boss.
Insert the oil wick about 1/2 inch in the bore of the take-up lever. With the oil groove up, insert the take-
up lever pin in the lever, making sure the wick is in the groove and press the pin into its hole in the arm. There
should be no end play in the take-up lever after the set screw is securely tightened. Replace the plastic
p l u g .
Replace presser bar guide and presser bar spring washer
into position. Place presser bar into presser bar roller
bracket with flat on bar to the rear and tighten hex
head screw and set screw securely.
Line up needle hole in the presser foot with the needle
and tighten presser bar guide screw.
Assemble presser spring, presser spring washer and
presser spring regulator screw.
Refer to paragraph on "Presser Bar Guide" for proper
setting of the guide.
Should the alignment test show the main shaft is out of
position, the upper sprocket and handwheel should be
l o o s e n e d a n d t h e s h a f t m o v e d l e f t o r r i g h t a s t h e
conditions indicate. Retighten sprocket and handwheel
so that there is no end play in the upper main shaft and
repeat the alignment check.
HANDWHEEL
The handwheel is constructed so as to minimize noise and is therefore isolated from the pulley by shock
mounts. If for any reason the handwheel is disassembled, the following steps should be used for reassembly.
