artisan 1798-1 AZ, Instruction Manual, Page: 12 / 36

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14. REPLACE ROTATING HOOK
1) Lift needle bar to the highest position of its stroke.
2) Remove throat plate, take down needle and bobbin case.
3) Loosen Screw (C) of hook position and take down Hook
Position (B).
4) Loosen two Screws (D) of rotating hook.
5) Turn balance wheel to raise feed bar to its highest
position, then take down the rotating hook by turning it
away from feed bar.
6) Installing the hook can be done in reverse sequence.
Note that Needle (A) and the convex surface of Hook
Position (B) should align with a clearance of 0.5-0.7mm
between them.
15. ADJUST OPENING TIME OF THE TENSION DISCS
Within the presser foot lift range of
2-7mm opening time of the tension discs
can be adjusted as follows:
1) Remove the rubber plug from the back
of arm and loosen Screw (A) of knee lifter
lever (left).
2) Move the tension releasing cam
leftward for earlier opening or rightward for
later opening. It will facilitate the
adjustment to put under the presser foot a
block as thick as the presser foot lift.
3) After the adjustment, fully tighten
Screw (A).
16. ADJUST THE HEIGHT OF FEED DOG
1) Turn balance wheel until feed dog is lifted to its highest position from throat plate surface.
2) Loosen Screw (A) of feed lifting rock shaft crank right
3) Move Feed Bar (B) in the direction shown by the arrow to adjust the height of the feed dog. The standard
height of feed dog is that the top of feed dog is 1mm above Throat Plate Surface (B).