Harbor Freight Tools 3914 - Manual (Page 17)

Page 17 For technical questions, please call 1-800-444-3353. SKU 3914
Figure 29
Presser
Foot Lever
(18d)
Raises
Presser
Foot
Lowers
Presser
Foot
1. To raise the Presser Foot, turn the
Presser Foot Lever up. The Presser Foot
will go up about 1/4” and stop.
To lower the Presser Foot, turn the
2.
Presser Foot Lever down.
Setting the presser Foot pressure
Figure 30
Increase
Tension
Decrease
Tension
Presser
Regulator
(20d)
Presser
Spring
Regulator Nut
(19d)
1. Loosen the Presser Spring Regulator
Nut (19d) by turning it counterclockwise.
Turn the Presser Regulator (20d)
2.
clockwise to increase Presser Foot
pressure and counterclockwise to
decrease Presser Foot pressure.
After adjustment, tighten the Presser
3.
Spring Regulator Nut.
adVanced SettingS
The Sewing Machine is set at the factory
for using with jean weight materials. The
following adjustments are needed only when
using the machine for unusual types of fabric
or when changing machine components.
These procedures should be performed only
by a qualified sewing machine technician.
adjusting the Feed timing
Set
Screws
Rotating Hook (20c)
Figure 31
1. Loosen Set Screws on the side of the
Rotating Hook (20c) and re-position the
Rotating Hook as follows:
To advance the feed timing in order to a.
prevent uneven material feed, rotate the
Rotating Hook up (clockwise).
To delay the feed timing in order to
b.
increase stitch tightness, rotate the
Rotating Hook down (counterclockwise).
Retighten the Set Screws. 2.
adjusting Feed dog height
The Feed Dog is factory adjusted so that
it juts out from the Throat Plate surface .031”
(0.8 mm) to .035” (0.9 mm). If the Feed Dog
juts out too much, puckering may result when
sewing lightweight materials. To adjust the
height of the Feed Dog:
reV 10b