Align the cylinder of the thread take-up lever with the recess for the hinge stud. Before you insert the hinge stud, turn the hinge stud and note the flat machined surface running the length of the stud. Replace the stud with the machined surface up. Install the setscrew.
Hold the needlebar rock frame in the left hand with the rounded end up and the straight side facing left. Insert the slide block in the space provided with the oil hole facing up.
Before you insert the needlebar rock frame assembly, turn the balance wheel until the needlebar connecting link is at its lowest position. Insert the assembly into the face of the machine so that the connecting stud enters the connecting link and the slide block is placed over the projection on the needlebar rock frame rockshaft. At the same time, the vibrating presser barspring guide rod with the spring attached must be positioned into the hole at the top of the face. Hold the assembly in position.
While you are holding the assembly in position, insert the hinge stud so that the flat surface is up. Install and tighten the setscrew.
Install the needlebar rock frame. Position bracket in position and tighten it in place.
Insert the thread tension release lever rod in the hole in the back of the machine head so that the rounded end is facing toward the operator.
Insert the presser bar through the upper bushing located in the top of the machine head, about 3 1/2 inches. Place the presser bar position bar guide lever so that the pinch screw is to the rear and the arm is to the left. At this time the lifting-and-releasing unit must be installed. It consists of a lifting bracket, a releasing bracket, and a spring that separates the two parts. While you are holding the unit together, place it into the face so that the two long levers cover the releasing rod. Now twist the presser bar down through the unit. Before you lower the presser bar through the lower bushing, insert the presser bar spring bracket with the slot up. Lower the presser bar through the lower bushing. Turn it so that the 4-30 unthreaded end of the hole faces left. Insert the presser foot in the slot. Replace the screw and tighten it.
Place the slotted end of the presser bar position guide through the opening in the top of the machine head so that it fits over the arm of the presser bar position guide lever. When you complete this step, the top of the presser bar position guide will be flush with the top of the machine head. Tighten the spline screw in the rear of the head.
Tilt the machine down and place the long curved end of the presser bar spring through the opening in the back of the machine head and into the slot in the presser bar spring bracket. Place the small curved end over the presser bar spring-support screw. Push it down and under the presser spring-regulating screw. Tighten the presser bar spring-support screw. Install the large guide screw.
NOTE: Preadjust the spring bracket with the presser foot firmly on the throat plate, and make sure the foot is straight. Raise the presser bar spring bracket about one-eighth inch and tighten the pinch screw.
At this time, adjust the presser bar guide lever one-quarter inch up from the bottom of the guide as in figure 4-7 (K).
Tighten the pinch screw (figure 4-11 [B]).
Place the large end of the line on the front presser bar stud.
The bell crank has three attachment points: (1) the bell crank connection link, (2) the lifting lever bell crank stud, and (3) the front presser bar connecting link stud. All three must be engaged at the same time. Install and tighten the retaining screw.Continue Reading