Harbor Freight Tools 3914 - Manual (Page 10)

Page 10 For technical questions, please call 1-800-444-3353. SKU 3914
reV 04c, 05d, 07g, 10b
and turn it around. Move the belt by hand
to verify that it is aligned and tracking
correctly.
Once you have the Pulleys aligned,
2.
remove the Belt from the Sewing
Machine Hand Wheel (7b), and tighten
its Set Screws (8b). Replace the Pulley
and tighten the Motor Set Screw (7j).
Attach the Pulley Safety Cover (1j) over
3.
the motor Pulley (8j), using the Bolt (2j),
Spring Washer (3j), Flat Washer (4j), and
Lock Nut (5j).
adjusting the Belt tension
Figure 11
Belt Adjustment
Bolt (48j)
Lower Nut (45j)
Belt (71j)
Motor
Upper Nut (45j)
Motor Housing
Flange
1. To tighten the Belt (71j) tension, turn the
lower Nut (45j) on the Belt Adjustment
Bolt (48j) counterclockwise, moving the
nut down towards the end of the bolt
enough so that the motor hangs as low
as its weight allows. Turn the upper Nut
(45j) counterclockwise until it tightens
against the Motor Housing Flange. The
proper tension is reached when the Belt
can only be pushed in 1/2 inch. Test the
Belt tension. If it needs to be tighter,
move the lower Nut and push the motor
down. Tighten in place with the upper
Nut.
caution: Do not tighten the Belt so much
that the left side of the Sewing Machine
begins to lift up from the Oil Pan.
Once the Belt is the proper tension,
2.
tighten both Nuts against the Motor
Housing Flange to hold the motor in
place.
Install the Pulley Safety Cover (1j) over
3.
the motor Pulley (8j), using the Bolts (2j),
Flat Washers (4j), Spring Washers (3j),
and Nuts (5j).
Legs
Legs
Drawer
Possible ON/OFF Control Box locations
Pre-drilled Engine
mounting holes
Machine Rest Pin (19h) hole
Thread Stand hole
Pulley Belt Slot
Sewing Machine
Opening
Back of Tabletop
Front of Tabletop
Figure 12
ON/OFF Control Box
shown mounted on
right from underside of
tabletop.
4. Mount the ON/OFF Control Box (63j)
under the Tabletop, in one of the
locations shown above, using the Wood
Screws (72j) and Flat Washers (73j).
5. Connect the Treadle Joint Assembly
(from the Tabletop
3929 - sold
separately) to the
end of the motor
Clutch Arm (19j),
using the nut and
bolt on the end of
the Joint Assembly.
Adjust the length
and/or location of
the components if
needed.
Clutch
Arm
(19j)
Figure 13
Treadle Joint
Assembly
and Treadle
Pedal
(Tabletop
#3929 - sold
separately)
To adjust
length:
loosen nut
here,
slide
bars
as
needed,
then
tighten
nut.