HIGHLEAD GC20688 Series, Instruction Manual And Parts List, Page: 12 / 62

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19) Adjusting of the needle and the hook timing
(1) Set the stitch length to “0”.
(2) Remove the needle plate.
(3) Overturn the arm.
(4) Loosen the screw 1
(5) Turn the machine pulley to raise the needle bar
from its low position to the point that the needle rises
2.4 mm.
(6) Turn the rotary hook to align the rotary hook
tip with the center of the needle.
(7) Tighten the screw 1.
20) Hook protection
In looping stroke position the needle must abut on the hook
protection 1 without being displaced.
Move needle in looping stroke position by pulley. In looping
stroke position the hook tip is at the level of the middle of the
needle. Press needle against hook protection 1 manually. The
needle should not touch the hook tip.
21) Adjusting the needle and feed mechanism timing
(1) Horizontal feed direction
Set the feed adjustment dials to the maximum settings. Then turn the machine pulley until the needle bar is
at its lowest position. Then adjust so that the needle and the feed dog do not move even when the reverse lever is
moved up and down at this time.
a. Remove the bed upper cover 1.
b. Set the feed adjustment dial to the maximum settings.
c. Loosen the two screws 2.