JUKI UnionSpecial 36200UAD52, Adjusting Instructions / Illustrated Parts List

Page: 14 / 64

14
LOOPER ADJUSTMENTS (CONT.)
Looper Gauge
Turn the handwheel in operating direction until the looper has trav-
eled fully to the left. Loosen screw (A, Fig. 15) and move the looper
holder to the right or left until the distance from the point of the looper
to the center of the first (left) needle is 3/16" (4.8mm). Clearance
between the looper point and the scarf of the needle must not exceed
.002" (0.05mm). Turn screw (B) until the .002" (0.05mm) dimension is
achieved. Tighten screw (A).
NOTE: Looper gauge may need to be increased or decreased slightly
to obtain a proper stitch.
SETTING THE FRONT NEEDLE GUARD
Install needle guard (A, Fig. 16) and position it to touch but not deflect
the first needle. Slowly turn the handwheel in operating direction and
check the needles to make sure they are not pinched between the
looper and the needle guard.
SETTING THE FEED DOGS
Preliminary Setting:
Install the differential feed dog (A, Fig. 17) with screw (B).
Attach rear needle guard (C) to main feed dog (D),
pushing in fully to the rear and tighten screw (E). Install
main feed dog with screw (F).
As a starting point loosen screw (G) and set the slot in feed
bar eccentric stud (H) in a horizontal position. Tighten
screw (G). At the highest point of travel feed dogs (A and
D) should be the depth of one full tooth above throat plate
(J). Loosen screws (B and F) and adjust the height of each
feed dog by moving them up or down in the elongated
slot of the shank. Tighten screws (B and F). Loosen screw
(G) and turn stud (H) until the top of the feed dogs are
parallel to the throat plate. Rotating stud (H) will simulta-
neously level both feed dogs.
NOTE: When setting eccentric stud (H) if turned clock-
wise feeddogs should go up if turned counter-
clockwise feed dogs should go down.
Final Setting:
Both the main and differential feed dogs may be individu-
ally adjusted to height. Main feed dog (D) at its highest
position should rise above the top of the throat plate the
depth of one full tooth when the normal presser spring
pressure is applied. The differential feed (A) may then be
raised to it.
FIG. 16
FIG. 17
FIG. 15