Needle Bar Height - Singer 5400 Series Service Manual

Service Manual
Three rings are cut into the upper end of the needle bar. The distance between the center and lower
ring represents the rise required to form a thread loop at the eye of the needle required for hook point
seizure.
Check:
1-
Remove face plate, presser foot, needle, needle plate and bobbin case.
1
2- Insert a size 8 needle in the needle bar.
3- Set machine for straight stitch, center needle position.
4- Turn the hand wheel toward the front of the machine to bring the needle bar to its lowest position.
5- Observe the position of the center timing mark (A) with relation to the bottom face of the upper
needle bushing.
6- Turn the hand wheel toward the front of the machine to bring the lower timing mark (B) to the
same relative position as previously occupied by the center needle bar timing mark. In this position
the point of the hook (D) should be within the width of the blade of the needle. Adjust hook timing, if
necessary, to satisfy this requirement. (See pages 88-89)
7- Select zigzag, maximum width. Turn the hand wheel toward the front of the machine to move the
hook point to the rear of the needle when the needle is in the left zigzag position. The top of the
needle eye (E) should be 0,40 mm - 0,80 mm ( /64" - /32") below the underside of the hook point.
Adjustment:
1-
Loosen needle bar clamping screw (F) and raise or lower the needle bar to suit the left needle
position requirements.
2- Tighten screw (F) to pinch tightness.
3- Needle clamp hub (C) should be parallel with the front edge of the needle plate.
4- Securely tighten screw (F).
Rev. n .
o
MAY/00

Needle bar height

1 1
65
P/N 357773-002