JUKI LH-3500A Series Instruction Manual page 36

(2) Changing procedure to needle feed and the adjustment
The procedure is the reverse of "(1) Changing procedure to bottom feed and the adjustment".
Loosen hinge screw ❶ , move needle bar rocking rod ❷ from needle rocking rod fixing base ❸ to needle bar
rocking rod arm ❹ , and fix it with hinge screw ❶ .
Replace the feed dog, the throat plate and, the presser with the components for needle feed.
Loosen setscrews ❾ and  (2 places) in sprocket  . Loosen the setscrews in the order of  and ❾ . At
this time, remove the setscrew ❾ which is put in screw hole C, and put it in screw hole A which is located
on the opposite side at 180˚. (Fig. b)
Turn the pulley by 180˚ without turning the hook driving shaft, align the flat section of the hook driving shaft
with screw hole A in sprocket  , and fix with setscrews ❾ . It is the standard that screw No. 1  in hook
driving shaft rear bearing  aligns with the flat section of the hook driving shaft. (Fig. a)
Then fix screw No. 2  which is put in screw hole B in sprocket  as well.
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