Mitsubishi Electric PLK-J10050RH, Technical Manual

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(5) Turn the hand pulley and stop it at the position where the needle bar lifted 4.5 mm from its lowest position.
(6) Turn the hook by hand and stop it at the position where the hook point (No.6) meets with the center line of
the needle (No.7).
(7) Loosen the three of the hook set screw (No.9) then, move the hook by hand and adjust the clearance
between the hook point and the needle to be about 0.05 mm.
(8) Hold the hook and tighten the three hook set screws (No.9) securely. In this time, please make sure if
the hook set screw (No.9) nearest of hook point to be positioned with screw setting face (No.10) of the
lower shaft. The screw setting face (No.10) can be seen from the front side in a state that the inner
hook is removed.
<6>: Hook point
<7>: Needle
<9>
0.05mm
<6>
<6>
<7>
Detail of the hook point
<7>
4.5
mm
<9>: Hook set screw
<9>: Hook set screw <10>: Screw setting face
<10>
<10>
<9>