HIGHLEAD GC20618-1DZ, Instruction Manual Parts Catalog

Page: 12 / 53

— 10 —
（
2
）
Move the bolt upward to increase upper feed.
（
3
）
Move the special bolt downward to decrease the
upper feed.The upper feed and the lower feed theoretically
becomes equal at the reference line on the feed connection
crank(right).
Securely tighten the bolt after adjustment
23.WALKING FOOT AND PRESSER
FOOT VERTICAL STROKE
ADJUSTMENT
When fabric with large elasticity is sewn,or when thickness of fabric changes,the vertical stroke(movable
range)of the presser feet should be adjusted as follows:
Adjustment:
（
1
）
Open the cover plate,loosen the special bolt.
（
2
）
The vertical strokes of the presser feet become maximum when the crank rod is moved upward and
set.
（
3
）
The vertical strokes becomes minimum when the nut is moved downward and set.
（
4
）
After the adjustment,fully tighten the special bolt.
The vertical strokes of the presser feet can be adjusted within a range from 6mm to 2mm.
24. ADJUSTMENT THE STITCH TOLERANCE
Screwing the pin that connects the link of back-sewing with the crank of back-sewing(down)can adjust the
tolerance of between the stitches.Screwing the pin in clockwise can increase the stitch of forward
sewing,otherwise,the stitch of back-sewing will be increased.
25.INSTALLATION OF MOVABLE KNIFE
1) Installation of movable knife
（
1
）
Turn the balance wheel and lower the needle bar to the lowest position.
（
2
）
Push the cam follower crank so that the cam roller enters into the thread trimmer cam groove.
（
3
）
Turn the balance wheel until the black mark point on the arm meets the white mark point on the