Feed Dog Height; Timing Belt - JUKI HZL-30Z Service Manual

4-5 Feed dog height

Remove the throat plate.
How to adjust 1. Set the feed amount to "0".
2. Turn the hand wheel and bring the feed dog to its highest point.
3. Loosen shaft [ b ] and make a clearance between the cam and the top end of the shaft
4. Put the exclusive tool (jig) to the nut and loosen shaft [ a ] on the left-hand side.
5. Turn shaft [ a ] and adjust so that the height of the feed dog is 1±0.1 mm at the
6. Turn shaft [ b ] and adjust so that a clearance of 0.1 mm is provided between the shaft
Screwdriver
Jig
[a]

4-6 Timing belt

Remove the outer components. (Front cover, rear cover and face cover)
How to adjust 1. Loosen the setscrew in the idler installing
2. Turn the hand wheel and bring the needle
3. Turn the hook driving shaft and bring the
4. Be careful that the aforementioned 2. and
as illustrated in the figure.
position of the needle entry hole. Then fix the shaft with the nut.
and the cam. (To such an extent that the shaft slightly comes down when it is
pressed from the upper side.)
0.1 mm
[b]
base and loosen the tension of the timing
belt.
bar to the lowest point of its stroke.
feed dog to the lowest position of its stroke.
3. conditions do not change, and set the
timing belt so that the screw in the main
shaft pulley (asm.) faces toward you
(screw is temporarily tightened.).
Shaft
[c]
Cam
45°
-10- -10- -10- -10- -10-
When shaft [b] is loosened,
shaft [a] comes in contact
with the cam and a
clearance is provided
between the cam and the
top end [c] of the shaft.
Needle entry hole
1 ± 0.1 mm
Screw No. 1