Adjusting the height of the needle bar

The standard needle bar height is 8.5mm (21\64 in) clearance between the needle point and the surface of the throat plate when it has risen to it's full height.
To adjust loosen screw (1) (Fig 36) in the needle bar clamp, place timing gauge in the way shown in (Fig 37) adjust the height of the needle bar and firmly tighten the screw.
Never adjust the needle bar height by screw (2) (Fig 36) without loosening screw (1) of the needle bar clamp in any circumstances, because it will change the trajectory of the needle bar motion.

Adjusting the rocking motion of needle bar

The standard width of the stitch is 2.4 mm Replace the throat plate with timing gauge Fig39 and adjust the rocking motion of the needle bar so that the point comes down into the center of engraved line (A) and (B)
To adjust the front stroke loosen setscrew (1) Fig 40 and adjust the inclination of needle bar rocker assembly.

To adjust the back stroke to line (B) loosen rocker link (4) and fasten it again to the proper point in the slit in the adjusting arm (2) so that the needle point comes down into the center of the engraved line (B) this adjustment must be made in the normal direction of feed.No correct width of stitch can be obtained in the reverse feed of the machine This adjustment must be made accurately because it will effect the looper motion. If it is necessary to change the width of bite afterwards obtain a desired width by adjusting the fixing point of the rocker link.(4) In this case only the back stroke of the needle bar is changed while the front remains unchanged.

As the result of the above adjustment, the interaction between the needle and the looper will vary,which must be corrected according to the following paragraph