Harbor Freight Tools 3914, Assembly And Operating Instructions Manual

Page 9

SKU 03914

Figure D

a

b

c

d

Attaching the Needle

1.

Unplug the Power Cord from the electrical outlet.

2.

Select a proper needle size according to the
thread count and type of material being sewn.

3.

Turn the Hand Wheel until the needle bar
reaches the highest point of its stroke.

4.

Loosen Screw (2) and hold needle (1) with its
indented part “A” facing exactly to the right in
direction “B”.

5.

Insert the needle and push it up until it will go no further.

6.

While holding in place, securely tighten Screw (2).

Setting the Bobbin into the Bobbin Case

1.

Hold the Bobbin so that the thread exit is to the left,
and push the Bobbin into its case.

2.

Feed the thread through slit “A” and pull the thread in
direction “B”. By doing so, the thread will pass under
the tension spring and exit at notch “B”.

3.

Verify that the Bobbin rotates in the direction of the
arrow when thread “C” is pulled.

ON Position

This position is with the Connecting Rod

(6) pressed, as shown in 

Figure C.  The Bobbin

Winder will put pressure on the belt and cause the
machine to operate.  The Shaft on the Bobbin Winder
will also spin; winding thread onto the Bobbin, if the
Winder is set up to do so.

Winding Thread Onto the Bobbin

1.

Place a Bobbin onto the Bobbin Winder Shaft (5) as
shown at point 

d in Figure C, right.

2.

Route the Thread from the Spool (not shown) up through
the Thread Guide Tube (43, 

point a), the hole in the

Thread Tension Bracket Assembly (18, 

b), over and

under the far side of the Tension Disc (21,

 c), and connect

it to the Bobbin (

d).-See Figure D, right.

3.

While the Connecting Rod (6) is pressed (as shown in
both 

Figures C and D) the Bobbin Winder will be in the

‘ON’ position and the Bobbin will fill with thread.  When
finished, release the Connecting Rod and the Bobbin
Winder will reset to the ‘OFF’ position.

b

d

Figure C

REV 03/04

6

6