Page 1
SINGLE NEEDLE INDUSTRIAL
SEWING MACHINE
Model
3914
SET UP AND OPERATING INSTRUCTIONS
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright© 2005 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any artwork
contained herein may be reproduced in any shape or form without the express written consent of
Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein. Tools required for
assembly and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
REV 07f, 10b
Page 2
SPECIFICATIONS
Machine Type Heavy duty, industrial sewing machine; high speed, single needle-lock stitch
Drive V-belt driven (size 41 replacement belt)
Action Foot pedal operation, along with a knee and manual lifting arm for presser foot.
Feed Type Link style needle feed
Sewing Directions Forward and reverse feed
Machine Dimensions 20-3/4” L x 10” H
Accessories
Table Stand Kit Table Stand Kit (Model 03929) not included
Stitching Speed 5,500 SPM (Strokes per minute)
Motor Type Clutch motor; 3,450 RPM, 5.8/2.9 amps, 110/220 V~, 60 Hz; single phase
Sewing Thickness up to 5/16”
Overall weight 61.6 lb.
Note: Performance of this tool may vary depending on variations in local line voltage.
Extension cord usage may also affect tool performance.
Warning: Make certain that the voltage switch on the motor is set correctly for your use.
See page 6. This machine is set up for 110V usage. Rewiring of the plug and an
approriate outlet is required for 220V usage.
This Machine requires oil to be added before use - see page 6 for details.
- 2 Screwdrivers- 3 Bobbins- Small lubricating bottle with tip- Spare needles (size 90/14)
- Power Switch
Save This Manual
Read all instructions before using this
tool!
You will need the manual for the
safety warnings and precautions, assembly
instructions, operating and maintenance
procedures, parts list and diagram. Keep your
invoice with this manual. Write the invoice
number on the inside of the front cover. Keep
the manual and invoice in a safe and dry
place for future reference.
Keep work area clean1. . Cluttered areas
invite injuries.
Observe work area conditions2. . Do
not use machines or power tools in
damp or wet locations. Don’t expose to
rain. Keep work area well lighted. Do
not use electrically powered tools in the
presence of ammable gases or liquids.
SAFETY WARNINGS AND
PRECAUTIONS
WARNING: When using tool, basic
safety precautions should always
be followed to reduce the risk of
personal injury and damage to
Keep children away3. . Children must
never be allowed in the work area. Do
not let them handle machines, tools, or
extension cords.
Store idle equipment4. . When not in use,
tools must be stored in a dry location to
equipment.
REV 03d, 03e, 04c, 10b
Page 2 For technical questions, please call 1-800-444-3353. SKU 3914
Page 3
inhibit rust. Always lock up tools and
keep out of reach of children.
the machine work surface before
plugging it in.
Use the right product for the job5. . Do
not attempt to force a small product
or attachment to do the work of a
larger industrial tool. There are certain
applications for which this product was
designed. It will do the job better and
more safely at the rate for which it was
intended. Do not modify this product and
do not use this product for a purpose for
which it was not intended.
Dress properly6. . Do not wear loose
clothing or jewelry as they can be caught
in moving parts. Protective, electrically
nonconductive clothes and nonskid
footwear are recommended when
working. Wear restrictive hair covering
to contain long hair.
Do not overreach7. . Keep proper footing
and balance at all times. Do not reach
over or across running machines.
Maintain tools with care8. . Keep needles
sharp and tools clean for better and
safer performance. Follow instructions
for lubricating and changing accessories.
Inspect tool cords periodically and, if
damaged, have them repaired by a
qualied technician. The handles must
be kept clean, dry, and free from oil and
grease at all times.
Disconnect power9. . Always turn the
machine off and, if possible, disconnect
the power plug of the machine from the
receptacle before adjusting, repairing,
or cleaning the machine; leaving the
machine unattended; tilting the machine
head; or removing the V-belt.
Remove adjusting keys and 10.
wrenches. Check that keys and
adjusting wrenches are removed from
Avoid unintentional starting11. . Be sure
the switch is in the Off position when not
in use and before plugging in.
Stay alert12. . Watch what you are doing,
use common sense. Do not operate
when you are tired.
Check for damaged parts13. . Before
using any product, any part that appears
damaged should be carefully checked
to determine that it will operate properly
and perform its intended function. Check
for alignment and binding of moving
parts; any broken parts or mounting
xtures; and any other condition that may
affect proper operation. Any part that is
damaged should be properly repaired
or replaced by a qualied technician. Do
not use if any switch does not turn On
and Off properly.
Guard against electric shock14. . Prevent
body contact with grounded surfaces
such as pipes, radiators, ranges, and
refrigerator enclosures.
Replacement parts and accessories15. .
When servicing, use only identical
replacement parts. Use of any other
parts will void the warranty. Only use
accessories intended for use with this
tool. Approved accessories are available
from Harbor Freight Tools.
Do not operate tool if under the 16.
inuence of alcohol or drugs. Read
warning labels if taking prescription
medicine to determine if your judgment
or reexes are impaired while taking
drugs. If there is any doubt, do not
operate the tool.
Use proper size and type extension 17.
cord. If an extension cord is required,
it must be of the proper size and type
Page 3For technical questions, please call 1-800-444-3353.SKU 3914
Page 4
to supply the correct current to the
tool without heating up. Otherwise, the
extension cord could melt and catch re,
or cause electrical damage to the tool.
This tool requires use of an extension
cord with up to 10 amps capability (up
to 50 feet), with wire size rated at 18
AWG. Longer extension cords require
larger size wire. If you are using the tool
outdoors, use an extension cord rated
for outdoor use (signied by “WA” on the
jacket).
Maintenance18. . For your safety, service
and maintenance should be performed
regularly by a qualied technician.
Do not place your ngers into the thread 2.
take-up cover while the machine is
operating.
Never leave the machine running and 3.
unattended.
During operation, never place your head, 4.
hair, or hands in the proximity of the
hand wheel, V-belt, bobbin winder, or
motor.
Do not operate the machine with any 5.
safety guards removed.
This machine shall only be operated by 6.
appropriately trained operators.
People with pacemakers should 19.
consult their physician(s) before use.
Electromagnetic elds in close proximity
to heart pacemaker could cause
pacemaker interference or pacemaker
failure.
WARNING: The brass components of 20.
this product contain lead, a chemical
known to the State of California to cause
birth defects (or other reproductive
harm). (California Health & Safety code §
25249.5, et seq.)
The warnings, cautions, and 21.
instructions discussed in this
instruction manual cannot cover all
possible conditions and situations
that may occur. It must be understood
by the operator that common sense
and caution are factors which cannot
be built into this product, but must be
supplied by the operator.
Sewing Safety Precautions
For your personal protection, we 7.
recommend you wear ANSI approved
safety glasses when using the machine.
If oil or grease comes in contact with 8.
your eyes or skin, immediately wash the
affected areas and consult a physician.
Tampering, modifying or altering any 9.
device (aside from the cord and plug by
a licensed electrician) on the machine is
prohibited and will void manufacturer’s
warranty.
Repair, adjustment, and specic 10.
maintenance shall only be performed by
a qualied service technician. Alteration
or replacement of the 3 prong grounded
electrical plug provided with the machine
must only be performed by a licensed
electrician. This machine must be
properly grounded.
This sewing machine is only to be used 11.
for the purpose intended.
Keep hands away from the needle when 1.
you turn the power switch on, or while
the machine is operating.
Page 4 For technical questions, please call 1-800-444-3353. SKU 3914
REV 07a, 10b
Page 5
GROUNDING
TO PREVENT
ELECTRIC SHOCK
AND DEATH FROM INCORRECT
GROUNDING WIRE
CONNECTION:
Check with a qualied electrician
if you are in doubt as to whether
the outlet is properly grounded.
Do not modify the power cord
plug provided with the tool.
Never remove the grounding
prong from the plug. Do not use
the tool if the power cord or plug
is damaged. If damaged, have it
repaired by a service facility
before use. If the plug will not t
the outlet, have a proper outlet
installed by a qualied
electrician.
Grounded Tools: Tools with Three
Prong Plugs
The grounding prong in the plug is 2.
connected through the green wire inside
the cord to the grounding system in the
tool. The green wire in the cord must
be the only wire connected to the tool’s
grounding system and must never be
attached to an electrically “live” terminal.
(See 3-Prong Plug and Outlet.)
The tool must be plugged into an 3.
appropriate outlet, properly installed and
grounded in accordance with all codes
and ordinances. The plug and outlet
should look like those in the preceding
illustration. (See 3-Prong Plug and
Outlet.)
Extension Cords
Grounded1. tools require a three wire
extension cord. Double Insulated
tools can use either a two or three wire
extension cord.
As the distance from the supply outlet 2.
increases, you must use a heavier gauge
extension cord. Using extension cords
with inadequately sized wire causes a
serious drop in voltage, resulting in loss
of power and possible tool damage.
(See Table A.)
3-Prong Plug and Outlet
Tools marked with “Grounding Required” 1.
have a three wire cord and three prong
grounding plug. The plug must be
connected to a properly grounded outlet.
If the tool should electrically malfunction
or break down, grounding provides a
low resistance path to carry electricity
away from the user, reducing the risk of
electric shock. (See 3-Prong Plug and
Outlet.)
REV 10b
The smaller the gauge number of the 3.
wire, the greater the capacity of the cord.
For example, a 14 gauge cord can carry
a higher current than a 16 gauge cord.
(See Table A.)
When using more than one extension 4.
cord to make up the total length, make
sure each cord contains at least the
minimum wire size required. (See Table
A.)
If you are using one extension cord for 5.
more than one tool, add the nameplate
amperes and use the sum to determine
Page 5For technical questions, please call 1-800-444-3353.SKU 3914
Page 6
the required minimum cord size. (See
Table A.)
Symbology
If you are using an extension cord 6.
outdoors, make sure it is marked with the
sufx “W-A” (“W” in Canada) to indicate it
is acceptable for outdoor use.
Make sure the extension cord is properly 7.
wired and in good electrical condition.
Always replace a damaged extension
cord or have it repaired by a qualied
electrician before using it.
Protect the extension cords from sharp 8.
objects, excessive heat, and damp or
wet areas.
RECOMMENDED MINIMUM WIRE GAUGE
FOR EXTENSION CORDS* (120/240 VOLT)
NAMEPLATE
AMPERES
(at full load)
0 – 2.0 18 18 18 18 16
2.1 – 3.4 18 18 18 16 14
3.5 – 5.0 18 18 16 14 12
5.1 – 7.0 18 16 14 12 12
7.1 – 12.0 18 14 12 10 -
12.1 – 16.0 14 12 10 - -
16.1 – 20.0 12 10 - - -
TABLE A
EXTENSION CORD
LENGTH
25’ 50’ 75’ 100’ 150’
* Based on limiting the line volt-
age drop to ve volts at 150% of
the rated amperes.
Double Insulated
Canadian Standards Association
Underwriters Laboratories, Inc.
V~
A
n0 xxxx/min.
Volts Alternating Current
Amperes
No Load Revolutions per Minute
(RPM)
UNPACKING
When unpacking, check to make sure
that the parts shown in the photo on the
following page are included. Note that the
machine table shown is not included, and
must be ordered separately. If any parts are
missing or broken, please call Harbor Freight
Tools at the number on the cover of this
manual as soon as possible.
Page 6 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 7
ASSEMBLY
of the machine, depending on the user’s
preference.
Sewing Machine
Table Stand and
Top (not provided)
Motor
Knee Lifting Arm
for Presser Foot
Power
Switch
Figure 1
The assembly instructions describe mounting
the Single-Needle Sewing Machine (Model
03914) to the Table Stand (Model 03929), not
included. In order to complete this procedure,
you must rst purchase and assemble the
Table Stand Kit (Model 03929).
Installing the Oil Pan and Sewing Machine
to the Tabletop of Industrial Sewing
Machine Table (SKU 3929 - sold separately)
Oil Pan (1g) hole
in Tabletop (30)
Hinge Indentations in Tabletop
Back of
Sewing
Machine
Oil Pan (1g)
Hinge (1h)
Figure 3
2. Seat the Oil Pan (1g) on the Rubber
Pads and Cushions in the Tabletop
opening.
Insert the Hinge Cushions (2h) into the 3.
tabletop, securing them with two Tacks
(25g) in each Hinge Cushion.
Insert the Hinges (1h) into the holes in 4.
the back of the Sewing Machine.
Rubber Pads (23g)
Corner Rests
Rubber Cushions (24g)
(Operator Side of Table)
Rubber Pads (23g)
Rubber Cushions (24g)
Figure 2
1. Working in the rectangular hole of the
Tabletop where the Oil Pan (1g) will sit:
Place the Rubber Cushions (24g) on
the operator-side corner rests, and the
Rubber Pads (23g) on the hinge-side
corner rests. Secure with two Tacks
(25g) in each Pad or Cushion.
Note: The Rubber Pads (23g) are optional.
They may be omitted, or used under the
Rubber Cushions (24g) to adjust the tilt
REV 07f, 10b
Machine Rest
Pin (19h)
Figure 4
5. Insert the Machine Rest Pin (19h) in the
hole provided in the table stand.
Carefully place the machine, hinge side 6.
rst, into the Rubber Hinge Plates and
over the Oil Pan.
Page 7For technical questions, please call 1-800-444-3353.SKU 3914
Page 8
Knee Press
Lifter Rod (2g)
Hand Wheel
Oil Pan Magnet
(22g)
Oil Sight
Window (1f)
(7b)
Figure 5
7. Tilt the machine back to expose the Oil
Pan (1g). Insert the Knee Press Lifter
Rod (2g). Place the Oil Pan Magnet
(22g) in the lowest portion of the Oil Pan.
Fill the Oil Pan with the Oil (20h) to the 8.
“High” mark “A”. Add more oil when
the level is to the “Low” mark “B”. After
lubrication, and during operation, oil
splashing can be seen through the Oil
Sight Window (1f).
Tilt the machine head back to the table 9.
top.
Mounting the Motor
Note: The Motor is heavy. You will need a
helper to hold the motor in place while
tightening the Nuts (67j) on the Carriage
Bolts (70j) in step 5 on the following
page.
Motor Rotation Switch
Always keep to right
Receptacle for
110/220 V Switch
Always keep to left (110V)
(Unless power plug is rewired for
220v by a qualied electrician.)
6 volt work light
(not included)
Figure 6
1. The motor can be set for 110V or 220v.
Make certain that the voltage switch
on the motor is set correctly for your
use. This machine is set up for 110V
usage. Set the 110/220V Switch to
110V (Switch to the left) unless you
have your outlet changed to 220V by
a qualied electrician. Rewiring of
the plug and an approriate outlet is
required for 220V usage.
The rotation of the motor can also be 2.
set to clockwise or counterclockwise
rotation. This setting should always be
set to the right, which makes the sewing
machine pulley rotate counterclockwise.
Do not use this setting to reverse the
direction of the machine. Use the
Reverse Control Lever (22e) to reverse
the stitch feed direction when sewing.
Page 8 For technical questions, please call 1-800-444-3353. SKU 3914
REV 03d, 03e, 07g, 10b
Page 9
Hand Wheel
Set Screws
(8b)
(One on
each side of
the Pulley)
(7b)
Sewing Machine
Belt (71j)
Carriage Bolts (70j),
Flat Washer (69j),
Spring Washer (68j),
Nut (67j)
Main Shaft
(32b)
Slot in Tabletop for belt
Figure 7
Bobbin Winder Assembly
3. Slide the Sewing Machine Hand Wheel
(7b) onto the Main Shaft (32b) of the
Sewing Machine. Align one of the Set
Screw holes (on the side of the Pulley)
with the at section of the Main Shaft.
Tighten the Set Screws (8b) enough
to hold the Pulley in place, but not fully
tightened.
Back of Sewing Machine
Slot with Pulley Belt
Carriage Bolts (70j)
ush with Tabletop
Figure 9
5. Mount the Motor to the underside of the
tabletop using the Carriage Bolts (70j),
Flat Washers (69j), Spring Washers
(68j), and Nuts (67j). Finger tighten only.
Aligning the Pulleys
Belt (71j)
Set Screw (7j)
Motor
Back of Tabletop
Figure 8
4. Using a rubber mallet (sold separately)
tap the three Carriage Bolts (70j) into the
top of the Tabletop so that they are ush
with the tabletop.
REV 04c; 07g, 10b
Pulley (8j)
Figure 10
1. Place the Belt (71j) around the Sewing
Machine Hand Wheel (7b), through the
slot in the table top, and around the
motor Pulley (8j). Make sure the motor
pulley is in line with the Sewing Machine
Hand Wheel. If you cannot get the
Pulleys to line up by sliding them slightly
in either direction, you may need to turn
the Motor Pulley around. To do this,
loosen the Set Screw (7j) on the motor
Pulley, slide the Pulley off of the motor
Page 9For technical questions, please call 1-800-444-3353.SKU 3914
Page 10
and turn it around. Move the belt by hand
to verify that it is aligned and tracking
correctly.
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 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
Upper Nut (45j)
Motor Housing
Flange
Lower Nut (45j)
Belt Adjustment
Bolt (48j)
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).
Thread Stand hole
Pulley Belt Slot
Legs
Drawer
Possible ON/OFF Control Box locations
ON/OFF Control Box
shown mounted on
right from underside of
tabletop.
Back of Tabletop
Machine Rest Pin (19h) hole
Pre-drilled Engine
mounting holes
Sewing Machine
Opening
Front of Tabletop
Legs
Motor
Belt (71j)
Figure 12
4. Mount the ON/OFF Control Box (63j)
under the Tabletop, in one of the
Figure 11
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.
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
To adjust
length:
loosen nut
here,
slide
bars
as
needed,
then
tighten
nut.
and/or location of
the components if
needed.
Figure 13
REV 04c, 05d, 07g, 10b
Page 10 For technical questions, please call 1-800-444-3353. SKU 3914
Clutch
Arm
(19j)
Treadle Joint
Assembly
and Treadle
Pedal
(Tabletop
#3929 - sold
separately)
Page 11
Mounting the Thread Stand
Thread Hanger
(28i)
Column Pipe
Connector (33i)
Spool
Pins
(40i)
Upper Spool
Rest Rod
(30i)
Lower Spool
Rest Rod
(36i)
Figure 13
Note: The Thread Stand is designed to be
mounted on the Table Stand Kit (Model
03929-sold separately). Unless
indicated otherwise, all parts referred to
in this set of instructions are listed in the
I - Bobbin Winder & Thread Stand Unit
Parts List and Diagram. During
assembly, it will be helpful to refer to that
list and diagram.
Back of Tabletop
Machine Rest Pin (19h) hole
Pre-drilled Engine
mounting holes
Thread Stand hole
If needed, bend the Spool Support (46i) 7.
so it slides easily over the Lower Spool
Rest Rod (36i), then slide it over the
Lower Spool Rest Rod, about halfway
down. Insert a Bolt (31i) and Nut (47i)
through the Support.
Note: The Support has tabs that hold onto
the corners of the Nut to make tightening
easier. When assembling, place the Nut
on the side with these tabs.
Tighten the Screw.8.
Insert the threaded end of the Spool Pin 9.
(40i) through one of the holes in the top
of the arm of the Spool Support (46i).
Place a Washer (32i) and Nut (35i) over
the end of the Pin and tighten. Place the
Spool Rest (41i), Spool Mat (42i), and
the Spool Vibration Stopper (39i) over
the end of the Spool Pin. Repeat this
step for both of the Spool Pins (40i).
Place the Column Pipe Connector (33i) 10.
over the top of the Lower Spool Rest
Rod (36i) until the Rod is about halfway
through the Connector. Place a Bolt
(34i) and Nut (35i) through the bottom
hole in the Connector and nger-tighten.
Sewing Machine
Opening
Pulley Belt Slot
Front of Tabletop
Possible ON/OFF Control Box location
Legs
Figure 14
6. Place the Washer (37i) onto the Lower
Spool Rest Rod (36i) and insert the Rod
into the Thread Stand Hole in the far
right back corner of the tabletop (see
above). Place another Washer (37i) over
the end of the Rod, and thread on and
tighten a Nut (38i).
REV 04c, 05d, 10b
Place the Upper Spool Rest Rod 11.
(30i) into the top of the Column Pipe
Connector (33i). Place a Bolt (34i) and
Nut (35i) through the top hole in the
Connector. Tighten all of the Screws and
Nuts in the Connector.
Remove the Column Cap (29i) from 12.
the top of the Upper Spool Rest Rod
(30i). If needed, bend open the Thread
Hanger (28i) so it slides easily over the
Upper Spool Rest Rod. Slide the Thread
Hanger about halfway over the top of
the Upper Spool Rest Rod. Insert a Bolt
(31i) and Nut (47i) through the Hanger
as explained in the note in step 7, above.
Tighten the Screw and place the Column
Page 11For technical questions, please call 1-800-444-3353.SKU 3914
Page 12
Cap over the end of the Upper Spool
Rest Rod.
Washers (27i). Leave the Screws just
loose enough to allow the Base to slide.
Mounting the Bobbin Winder
The Bobbin Winder is used to wind
thread onto the Bobbin (17h). It is
mounted so that it contacts the Belt (71j)
when needed for bobbin winding.
Note: Unless indicated otherwise, all parts
referred to in this set of instructions are
listed in the I - Bobbin Winder & Thread
Stand Unit Parts List and Diagram.
During assembly, it will be helpful to refer
to that list and diagram.
Set the Bobbin Winder to the ‘ON’ 13.
Position - See Bobbin Winder
Operation on the following page.
Less than 1/8” gap
between Belt (71j) and Wheel (3i)
Belt (71j)
Wheel (3i)
Figure 16
16. Put the Bobbin Winder in the ‘OFF’
position - See Bobbin Winder
Operation on the following page. Slide
the Bobbin Winder Assembly close to
the belt until it just barely doesn’t touch
it (1/8” gap or less) - as shown above.
Tighten the Wood Screws (26i) securely.
Mark
Pilot
Holes
Here.
Figure 15
14. Make sure the Bobbin Winder is in the
‘ON’ position. Position the Base (1i)
so that the Wheel (3i) lines up with, and
just touches, the belt. Mark pilot hole
locations on the table through the center
of each of the two channels in the Base,
as indicated above.
Set the Base (1i) aside and drill pilot 15.
holes for each of the two marked
locations. Reposition the base and
secure using two Wood Screws (26i) and
Installing the Belt Covers
Install the Front Belt Cover (4h) over 1.
the Sewing Machine Hand Wheel (7b),
using the Belt Cover Support (11h), the
Belt Cover Bolts (10h, 12h), and the Belt
Cover Cap (5h).
To install the Rear Belt Cover (7h), align 2.
the cover on the Tabletop over the back
side of the opening where the Belt (71j)
enters the tabletop. Mark where to drill
holes. Remove the Rear Belt Cover and
drill pilot holes. Secure the Rear Belt
Cover in place using Wood Screws (9h).
OPERATION
Caution: To properly break-in your new
sewing machine, and avoid possible
damage to the machine, sew at
Page 12 For technical questions, please call 1-800-444-3353. SKU 3914
REV 07a, 10b
Page 13
moderate to slow speeds for the rst
15 minutes of use.
right. Insert the Needle and push it up
until it will go no farther.
WARNING: Shut the machine off
completely before working around the
needle or other moving parts.
BASIC SETTINGS
You will need to make the following
adjustments on a regular basis when using
the machine.
Attaching the Needle
The needles supplied with the Sewing
Machine are size 90/14 (DBX1). The
shank is size 16 x 257. For leatherwork
use a 16 x 95 needle. This machine can
accommodate a needle up to size 22.
Note: Industrial sewing machine needles
have a round shank (the top part of the
needle that slides up into the machine).
Do not use needles, such as most home
sewing needles, which have a at area
on the shank of the needle.
Unplug the Power Cord.1.
Select the proper needle size for the 2.
thread count and material being sewn.
Turn the Hand Wheel (7b) 3.
counterclockwise until the Needle Bar
reaches the highest point of its stroke.
While holding in place, securely tighten 5.
the Bolt.
Bobbin Winder Operation
The Bobbin Winder is used to wind
thread onto the Bobbin. The Bobbin
Winder has two positions, ‘ON’ and
‘OFF’:
OFF Position
Pull tab on
Connecting Rod (6i)
to disengage
Winder
Figure 18
Pull the tab on the Connecting Rod (6i)
to disengage the Winder from the Belt.
The Bobbin Winder will not contact the
belt.
ON Position
Press here to
push Winder
toward Belt
Position
OFF
Loosen Bolt (25c)
Shank
Figure 17
Side ViewFront View
4. Loosen the Bolt (25c) and hold Needle
(23c) with its indented part facing to the
REV 07a, 10b
Face indented
section to right
when inserting
needle
ON
Figure 19
Position
This position is with the Connecting Rod
(6i) pressed, as shown above. The Shaft
on the Bobbin Winder will spin, winding
thread onto the Bobbin.
Page 13For technical questions, please call 1-800-444-3353.SKU 3914
Page 14
Winding Thread Onto the Bobbin
Setting the Bobbin into the Bobbin
Case and into the Machine
Thread Guide Hole
(43i)
Thread
Bobbin (17h)
Bobbin Winder Shaft (5i)
Tension
Bracket
(18i)
Tension
Discs
(21i)
Figure 20
1. Route the Thread from the Spool, up
through the Thread Guide Hole (43i),
through the hole in the Thread Tension
Bracket (18i), then over and under
between the Tension Discs (21i).
Wrap the thread end around the Bobbin 2.
(17h), overlapping it several times to
secure the thread on the bobbin.
3. Place the Bobbin onto the Bobbin
Winder Shaft (5i)
with the thread
coming from
Connecting
Rod (6i)
Bobbin
Winder
underneath (See
Figure 20). If
needed, use the
large Screw
Driver (14h) or a
pair of pliers
Figure 21
(sold separately)
to open or close the end of the Shaft so
the Bobbin is snug enough to turn with
the Shaft, yet can still be pulled off easily.
Thread
from
Spool
(not
shown)
Shaft
(5i)
A
Bobbin Case (21c)
Figure 22
B
C
Bobbin
(22c)
1. After lling the Bobbin (22c) with thread,
hold it so that the thread exits to the left,
and push it into the Bobbin Case (21c).
Following Figure 22, feed the thread 2.
through slit “A” and pull the thread in
direction “C”. By doing so, the thread will
pass under the tension spring and exit at
notch “B”.
Verify that the Bobbin rotates in the 3.
direction of the arrow when thread “C” is
pulled.
Pull out at least 4” of thread.4.
On the top of the machine, rotate the 5.
Hand Wheel counterclockwise until the
needle is in its topmost position.
Underside of Machine
Bobbin (22c)
Thread
Bobbin Case (21c)
Hinged
Latch
on Bobbin
Case
Rotating
Hook (20c)
Figure 23
Turn on power to the Sewing Machine, 4.
press the Treadle Pedal, then the
Connecting Rod (6i) to engage the
Bobbin Winder and wind thread onto
the Bobbin. When nished, release the
Connecting Rod, the Treadle Pedal and
turn off power to the Sewing Machine.
Cut the thread and remove the Bobbin.
Page 14 For technical questions, please call 1-800-444-3353. SKU 3914
6. Holding the Bobbin Case by the hinged
latch, insert the Bobbin Case into the
Rotating Hook (20c) from the underside
of the machine.
Release the hinged latch as the Bobbin 7.
Case slides into place.
REV 07a, 10b
Page 15
Threading the Top Thread
Set the spool of thread (sold separately) onto the top thread Spool
Pin (40i), (the left Spool Pin), and thread it through the eyelet directly
above on the Thread Hanger (28i). Guide the thread through the machine,
following the steps and photos below.
Note: There are two Spool Pins (40i). The left Pin is commonly used to
hold the spool of thread for the top thread (the thread that passes
through the top section of the machine), while the right Pin is used to
hold the spool of thread that is used for winding the bobbin.
Thread Hanger
(28i)
Spool
Pins
(40i)
Figure 24
Thread Tension Discs (27a)
Thread Take-up Cover (17a)
Thread Take-up
Eyelet (1b)
Faceplate
Thread
Guide (34a)
4
5
Thread Release
Finger ( 31d)
Take-up Spring
(9a)
Wire Needle
Bar Thread
Guide (26c)
Needle Bar
Thread Guide
(24c)
Needle (23c)
wire guide
Presser
Foot (9d)
Figure 25
Pass the thread between the two Thread 1.
1
Tension Discs (27a) on the top of the
machine.
Pass the thread up through the right 2.
2
3-Hole Thread
Eyelet (31a)
3
3 (detail)
Thread Guide
(35a)
eyelet then down through the left eyelet
on the 3-Hole Thread Eyelet (31a).
Pass the thread between the two Thread 3.
Tension Discs (7a) pulling to the right
until the thread catches in the Take-up
Spring (9a). Then pass under the Thread
Release Finger (31d) and behind the
Thread Guide (35a).
Thread Tension
Discs (7a)
Pass behind the Thread Take-up Cover 4.
(17a), through the Thread Take-up Eyelet
(1b) from right to left, and down through
5 (detail)
the Faceplate Thread Guide (34a).
Pass the thread into the Wire Needle Bar 5.
Thread Guide (26c), through the hole
in the Needle Bar Thread Guide (24c),
through the Needle (23c) from left to
right, under the wire guide and between
the opening in the Presser Foot (9d).
To pull the bobbin thread up to the top 6.
of the machine, hold the top thread
behind the Presser foot and turn the
Hand Wheel (7b) counterclockwsie until
the Needle catches the bobbin thread,
REV 10b
Page 15For technical questions, please call 1-800-444-3353.SKU 3914
Page 16
pulling it to the top of the machine. Pull
both threads behind the Presser Foot,
leaving at least 4” of excess thread.
Adjusting the Stitch Length
Adjusting the Bobbin Thread
Tension
Stitch Length
Dial (46e)
Figure 26
To increase or decrease the stitch length,
turn the Stitch Length Dial (46e) to
the desired number (in millimeters) as
indicated at (A) above.
Adjusting the Needle Thread Tension
Tension Adjustment
Knob (3a)
Increase
Tension
Tension
Adjustment
Screw
Decrease
Tension
Bobbin
Case (21c)
Figure 28
1. Using a small athead screwdriver (sold
separately), turn the Tension Adjustment
Screw on the Bobbin Case (21c)
clockwise to increase bobbin tension.
Turn the Tension Adjustment Screw 2.
counterclockwise to decrease bobbin
tension.
Raising the Presser Foot
Figure 27
1. Turn Tension Adjustment Knob (3a)
clockwise to increase thread tension.
Turn Tension Adjustment Knob 2.
counterclockwise to decrease thread
tension.
The Presser Foot (9d) can be raised
and lowered using the Presser Foot
Lever (18d) or the Knee Lifter (21g).
The Knee Lifter raises the Presser Foot
momentarily (to a height of up to 1/2”),
as long as it is pushed, while the Presser
Foot stays in the raised or lowered
position when using the Presser Foot
Lever.
Page 16 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 17
Presser
Foot Lever
(18d)
Figure 29
Raises
Presser
Foot
Lowers
Presser
Foot
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 qualied sewing machine technician.
Adjusting the Feed Timing
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
Increase
Tension
Figure 30
1. Loosen the Presser Spring Regulator
Nut (19d) by turning it counterclockwise.
Decrease
Tension
Presser
Spring
Regulator Nut
(19d)
Presser
Regulator
(20d)
Rotating Hook (20c)
Set
Screws
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
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.
REV 10b
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:
Page 17For technical questions, please call 1-800-444-3353.SKU 3914
Page 18
Feed Lifting
Shaft Crank (1e)
Feed Bar Body
Subassembly (4e)
Bolt (2e)
0.03”~0.033” ( )
0.028”~0.031” ( )
0.037”~0.041” ( )
When using a DBX1 needle, align to 3.
marker line “A” on the Needle Bar (31c)
with the bottom end of the Needle Bar
Lower Bushing (27c), then tighten Bolt
(28c).
When using a DAX1 needle, align to
marker line “B” on the Needle Bar (31c)
with the bottom end of the Needle Bar
Lower Bushing (27c), then tighten the
Bolt (28c).
Figure 32
1. Loosen the Bolt (2e) of the Feed Lifting
Shaft Crank (1e).
Move the Feed Bar Body Subassembly 2.
(4e) up or down to make the adjustment.
Tighten the Bolt (2e), being careful not to 3.
overtighten.
Adjusting Needle-to-hook Timing
Needle
Rubber Plug (46a)
&
Bolt (28c)
Needle
Bar Lower
Bushing
(27c)
Needle Bar
(31c)
Bar
(31c)
Hook
Blade
Point
When using a DBX1 needle, loosen 4.
Rotating Hook (20c) Set Screws, turn
the Hand Wheel, and align the marker
line “B” on the Needle Bar (31c) with
the bottom end of the Needle Bar Lower
Bushing (27c).
When using a DAX1 needle, align the
marker line “D” on the Needle Bar (31c)
with the bottom end of the Needle Bar
Lower Bushing (27c).
After making the adjustments in steps 3 5.
and 4, align the Hook Blade Point on the
Rotating Hook (20c) with the center of
the Needle.
Provide a clearance of .001” to .004”
(0.04 to 0.1 mm) between the Needle
and the Hook Blade Point. This
clearance is less than 1/64” (almost
touching). Securely tighten the Set
Screws on the Rotating Hook. If the
clearance is too small, the tip of the
Hook Blade Point will be abraded. If it is
too large, it will lead to skipped stitches.
Rotating
Figure 33
Hook (20c)
1. Turn the Hand Wheel (7b) to bring the
Needle Bar down to the lowest point of
its stroke.
Remove and set aside the Rubber Plug 2.
(46a). Loosen the Bolt (28c).
Page 18 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 19
Adjusting the Presser Bar Height
pulled out by the Thread Take-up
Spring.
The normal setting is when the marker c.
on the Thread Guide is aligned with the
center of the Bolt.
Rubber Plug
(37a)
&
Presser Bar
Set Screw
(32d)
Figure 34
1. Remove and set aside the Rubber Plug
(37a), and loosen the Presser Bar Set
Screw (32d).
Manually adjust the Presser Bar height, 2.
and the angle of the Presser Foot.
After adjusting, securely tighten the Set 3.
Screw and replace the Rubber Plug.
Adjusting the Thread Take-up Stroke
Thread Take-up
Spring (9a)
Thread Guide (35a)
Thread Guide Bolt (36a)
Tighten the Thread Guide Bolt after 2.
adjusting the Thread Guide.
Adjusting the Height of the Knee
Lifter
The standard height of the Presser Foot
lifted using the Knee Lifter is 0.39 inch (10
mm).
Stud (7g)
Knee Press
Lifter Crank
(15g)
Nut (8g)
Figure 36
1. To adjust the Presser Foot lift up to
0.5 inch (13 mm), adjust the Nut (8g)
placement on the Stud (7g), on the Knee
Press Lifter Crank (15g).
Normal
Setting
Figure 35
1. To adjust the thread take-up stroke,
loosen the Thread Guide Bolt (36a) and
slide the Thread Guide (35a) to the right
or left as described following:
When sewing heavy weight materials, a.
move the Thread Guide (35a) to the left
to increase the length of thread pulled
out by the Thread Take-up Spring (9a).
When sewing lightweight materials, b.
move the Thread Guide (35a) to the
REV 10b
right to decrease the length of thread
Needle Bar
Thread Guide
(24c)
Presser Foot
(9d)
Figure 37
2. When the Presser Foot lift is adjusted
over 0.39 inch (10 mm), be sure that the
Needle Bar Thread Guide (24c) does not
hit the Presser Foot (9d). This can be
manually checked by turning the Hand
Wheel (7b).
Page 19For technical questions, please call 1-800-444-3353.SKU 3914
Page 20
Adjusting Sewing Speed with
Pulleys (sold separately)
This machine is a fast running machine.
It can be adjusted to a slower running
machine by changing the pulley on
the motor to a smaller diameter pulley.
Consult a qualied sewing machine
repair shop to replace the pulley with a
1-3/4” or 1-1/2” pulley to slow the speed
of the machine.
MAINTENANCE
Advanced Machine adjustments should 1.
only be performed by a qualied
technician.
Check the oil level weekly when the 2.
machine is used daily. Add sewing
machine oil as required to the high level
marking.
Clean the machine with a clean, damp 3.
cloth. Do not use solvents or thinners.
After each use, check for lint build up 4.
and blow clean with pressurized air.
Remove and discard any stray thread or
fabric pieces.
Check the Belt (71j) tension after rst 5.
use and then weekly, and adjust as
described in Adjusting the Belt Tension
under the assembly instructions.
When not in use, cover the machine and 6.
store in a clean and dry location.
Page 20 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 21
MOTOR WIRING DIAGRAM
REV 07g, 10b
Page 21For technical questions, please call 1-800-444-3353.SKU 3914
Page 22
A - ARM BED PARTS LIST
Part Description Qty
1a Arm Bed Assembly 1
2a Tension Complete Subassembly 1
3a Tension Adjustment Knob 1
4a Thread Disc Rotation Stopper 1
5a Thread Tension Spring 1
6a Thread Release Disc 1
7a Thread Tension Disc 2
8a Tension Screw 1
9a Take-up Spring 1
10a Thread Tension Post Socket 1
11a Set Screw 1
12a Tension Release Pin 1
13a Oil Packing Subassembly 1
14a Oil Packing Cover 1
15a Oil Wick 1
16a Screw 1
17a Thread Take-up Cover 1
18a Take-up Lever Cover Screw 1
19a Faceplate Asm 1
20a Screw 8
21a Gasket 1
22a Rubber Plug 1
23a Rubber Plug 1
24a Thread Tension Screw 1
25a
26a Faceplate Retaining Thread Guide 1
27a Thread Tension Disc 2
28a Thread Tension Spring 1
29a Thread Tension Screw 1
Faceplate Thread Retaining Guide
Subassembly
1
Part Description Qty
Rubber Plug Needle Draining Crank
30a
Hole
31a Three-hole Thread Eyelet 1
32a Faceplate 1
33a Faceplate Sealing Gasket 1
34a Faceplate Thread Guide 1
35a Thread Guide 1
36a Thread Guide Bolt 2
37a Rubber Plug 2
38a Bed Slide Subassembly 1
39a Slide Plate 1
40a Slide Plate Spring 1
41a Slide Plate Spring Screw 2
42a Throat Plate 1
43a Throat Plate Screw 2
44a Bed Screw Stud 4
Rubber Plug Thread Take-up Lever
45a
Link Pin Hole
46a Rubber Plug 1
47a Brand Plate 1
48a Brand Plate Rivet 2
49a Main Shaft Bushing 1
50a Connecting Rod 1
51a Screw 2
DOL
12-Ha
FESM-
400a
Motor (Not Shown) 1
Servo motor
(Slower replacement for stock motor, not
shown, optional)
1
2
Note: When ordering parts for this component use the sufx “a”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 22 For technical questions, please call 1-800-444-3353. SKU 3914
REV 07a, 10b
Page 23
A- ARM BED ASSEMBLY DRAWING
46
Motor (DOL 12-Ha)
(Not Shown)
Page 23For technical questions, please call 1-800-444-3353.SKU 3914
Page 24
B - MAIN SHAFT PARTS LIST
Part Description Qty
1b Thread Take-up Eyelet 1
2b Needle Bar Crank 1
3b Set Screw 1
4b Bolt 1
5b O-Ring 1
6b Thread Take-up Lever Link 1
7b Hand Wheel 1
8b Set Screw 2
9b
Sealing Ring
10b
11b Plate 1
12b Feed Drive Cam 1
13b Snap Ring 1
14b Bolt 2
15b Set Screw 2
16b Main Shaft Thrust Collar 1
17b Main Shaft Middle Bushing 1
Main Shaft Rear Bushing
Sub-assembly
1
1
Part Description Qty
18b Set Screw 1
19b Thread Take-up Lever Link Pin 1
20b Oil Wick 1
21b End Bolt (left hand) 1
22b Thread Take-up Crank 1
23b
24b Needle Bearing 1
25b Needle Bar Crank Wearing Plate 1
26b
27b
28b Rubber Bushing 1
29b O-Ring 1
30b Main Shaft Felt 1
31b
32b Main Shaft 1
33b Bolt 2
34b Bolt 1
Needle Bar Crank Connecting Rod
Sub-assembly
Crank Oil Adjusting Sub-assembly
Crank Oil Adjusting Sub-assembly
Main Shaft Front Bushing
Sub-assembly
1
1
1
1
Note: When ordering parts for this component use the sufx “b”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 24 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 25
REV 10b
B - MAIN SHAFT ASSEMBLY DRAWING
Page 25For technical questions, please call 1-800-444-3353.SKU 3914
Page 26
C- STITCH DRIVE PARTS LIST
Part Description Qty
1c Bolt 1
2c Rotating Hook Positioning Finger 1
3c Upright Shaft Lower Bushing 1
4c Set Screw 8
5c Bevel Gear 1
6c Upright Shaft 1
7c Bevel Pinion 1
8c Bolt 2
9c Hook Driving Shaft Rear Bushing 1
10c Bolt 2
11c Hook Driving Shaft Thrust Collar 1
12c Hook Driving Shaft 1
13c
14c Set Screw 1
15c Set Screw 2
16c Hook Driving Shaft Front Thrust Collar 1
17c Oil Wick 1
18c Hook Driving Shaft Front Bolt 1
Hook Driving Shaft Front Bushing
Sub-assembly
1
Part Description Qty
19c Rotating Hook Sub-assembly 1
20c Rotating Hook 1
21c Bobbin Case 1
22c Bobbin 1
23c Needle 1
24c Needle Bar Thread Guide 1
25c Bolt 1
26c Wire Needle Bar Thread Guide 1
27c Needle Bar Lower Bushing 1
28c Bolt 1
29c Needle Bar Connecting Pin 1
30c Needle Bar Guide Block 1
31c Needle Bar 1
32c Needle Bar Upper Bushing 1
33c Rubber Plug 1
34c Bevel Gear 1
35c Bevel Pinion 1
36c Upright Shaft Upper Bushing 1
Note: When ordering parts for this component use the sufx “c”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 26 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 27
C - STITCH DRIVE ASSEMBLY DRAWING
Page 27For technical questions, please call 1-800-444-3353.SKU 3914
Page 28
D - PRESSER BAR PARTS LIST
Part Description Qty
1d Bolt 1
2d Bolt 1
3d Spring 1
4d Washer 1
5d Washer 1
6d Bolt 1
7d Snap Ring 1
8d Pin 1
9d Presser Foot 1
10d Bolt 1
11d Presser Bar 1
12d Presser Bar Bushing 1
13d Presser Bar Guide Bracket 1
14d Lift Hook 1
15d Spring 6
16d Connecting Rod Subassembly 1
17d Hand Lifter Cam 1
Part Description Qty
18d Presser Foot Lever 1
19d Presser Spring Regulator Nut 1
20d Presser Regulator 1
21d Tension Release Lever 1
22d Lifting Lever Presser Rod 1
23d Lifting Lever Rear Crank 1
24d Lifting Lever Presser Rod 1
25d Pressure Lever 1
26d O-Ring 1
27d Presser Spring 1
28d Lifting Lever Shaft Hinge Bolt 2
29d Spring 1
30d Hinge Bolt 1
31d Thread Release Finger 1
32d Presser Bar Set Screw 1
33d Bolt 2
Note: When ordering parts for this component use the sufx “d”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 28 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 29
D - PRESSER BAR ASSEMBLY DRAWING
Page 29For technical questions, please call 1-800-444-3353.SKU 3914
Page 30
E - FEED CONTROL PARTS LIST
Part Description Qty
1e Feed Lifting Shaft Crank 1
2e Bolt 1
3e Bolt 1
4e Feed Bar Body Subassembly 1
5e Feed Dog 1
6e Snap Ring 1
7e Bushing 1
8e Thrust Collar 1
9e Set Screw 1
10e Feed Drive Shaft 1
11e Feed Rocker Shaft 1
12e Bolt 1
13e Feed Drive Shaft Crank 1
14e Set Screw 1
15e Feed Drive Rocker Slate Subassembly 1
16e Shorter Feed Driving Rocker Slate 1
17e Connecting Pin 1
18e Rocker Slate 1
19e Pin 1
20e Connecting Pin 1
21e Pin 1
22e Reverse Control Lever 1
23e Set Screw 1
24e Feed Rocker 1
25e Oil Wick 1
26e Bolt 1
27e Bolt 1
28e Washer 1
29e Bolt 1
30e Feed Crank 1
31e Guide 1
32e Spring 1
Part Description Qty
33e Bolt 1
34e Connecting Rod 1
35e Rocker Slate Return Board 1
36e Bolt 1
37e Reverse Crank Subassembly 1
38e Connecting Rod 1
39e Feed Regulator 1
40e Feed Regulator Stud 1
41e Connecting Rod 1
42e O-Ring 1
43e Bolt 1
44e Lock Pin Spring 1
45e Lock Pin 1
46e Stitch Length Dial 1
47e Bolt 1
48e Bolt 1
49e Set Screw 1
50e Feed Reverse Shaft 1
51e O-Ring 1
52e Feed Reverse Spring 1
53e Bushing 1
54e Bolt 1
55e Nut 1
56e Bushing 1
57e Connecting Rod Pin 1
58e Snap Ring 1
59e Bolt 1
60e Rocker Slate Pin 1
61e Set Screw 1
62e Bolt 1
63e Feed Holder Shaft 1
Note: When ordering parts for this component use the sufx “e”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 30 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 31
E - FEED CONTROL ASSEMBLY DRAWING
Page 31For technical questions, please call 1-800-444-3353.SKU 3914
Page 32
F - LUBRICATION PARTS LIST
Part Description Qty
1f Oil Sight Window 1
2f Main Shaft Oil Tube 1
3f Oil Return Tube Holder 1
4f Oil Pump Installing Base 1
5f Lubrication Oil Pump Subassembly 1
6f Oil Pump Screen 1
7f Bushing 1
8f Impeller 1
9f Lubrication Oil Pump 1
10f Oil Return Pump Plunger 1
11f Bolt 1
12f Spring 1
13f Gasket 1
14f Cover 1
15f Bolt 1
16f Washer 1
Part Description Qty
17f Bolt 1
18f Bolt 1
19f Oil Pump Throughway 1
20f Rubber Joint 1
21f Oil Pump Brace 1
22f Bolt 1
23f Gasket 1
24f Oil Tube 1
25f Bolt 1
26f Spring 1
27f Oil Return Tube Holder 1
28f Oil Return Tube Plate 1
29f Oil Return Tube Holder 1
30f Bolt 1
31f Oil Return Clamp 1
32f O-Ring 1
Note: When ordering parts for this component use the sufx “f”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 32 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 33
F - LUBRICATION ASSEMBLY DRAWING
Page 33For technical questions, please call 1-800-444-3353.SKU 3914
Page 34
G - BASE ASSEMBLY DRAWING AND PARTS LIST
Part Description Qty
1g Oil Pan 1
2g Knee Press Lifter Rod 1
3g Rubber Cushion 4
4g Gasket 1
5g Bolt 1
6g O-Ring 1
7g Stud 2
8g Nut 2
9g Bolt 1
10g Spring 1
11g Snap Ring 1
12g Knee Press Shaft 1
13g Rubber Joint 1
Part Description Qty
14g Bolt 2
15g Knee Press Lifter Crank 1
16g Knee Press Plate Rod 1
17g Knee Press Plate Cover Joint 1
18g Knee Press Plate 1
19g Bolt 1
20g Knee Lifter Tube Holder 1
21g Knee Lifter 1
22g Oil Pan Magnet 1
23g Rubber Pad 2
24g Rubber Cushion 2
25g Tack 8
Note: When ordering parts for this component use the sufx “g”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 34 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 35
H - ACCESSORIES PARTS LIST AND ASSEMBLY DRAWING
Part Description Qty
1h Hinge 2
2h Hinge Cushion 2
3h Tack 4
4h Front Belt Cover 1
5h Belt Cover Cap 1
6h Rear Belt Cover Assembly 1
7h Rear Belt Cover 1
8h Rear Belt Cover Assembly 1
9h Wood Screw 1
10h Belt Cover Bolt 1
Part Description Qty
11h Belt Cover Support 1
12h Bolt 1
13h Bolt 1
14h Screwdriver (large) 1
15h Screwdriver (medium) 1
16h Screwdriver (small) 1
17h Bobbin 3
19h Machine Rest Pin 1
20h Oil 1
Note: When ordering parts for this component use the sufx “h”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
REV 10b
Page 35For technical questions, please call 1-800-444-3353.SKU 3914
Page 36
I - BOBBIN WINDER & THREAD STAND UNIT PARTS LIST
Part Description Qty
1i Base 1
2i Thread Winder Base Assembly 1
3i Wheel 1
4i Bolt 1
5i Bobbin Winder Shaft 1
6i Connecting Rod 1
7i Connecting Rod Pin 1
8i Bobbin Winder Frame Rod 1
9i Bobbin Winder Frame Pin 1
10i Bolt 1
11i Bobbin Winder Frame Pin 1
12i Bobbin Winder Frame Spring 1
13i Rubber Pad 1
14i Presser Plate 1
15i Bolt 1
16i Bobbin Winder Spring 1
17i Hinge Bolt 1
18i Thread Tension Bracket Assembly 1
19i Bolt 1
20i Bobbin Winder Tension Disc Collar 1
21i Tension Disc 2
22i Tension Spring 1
23i Thread Tension Stud Nut 1
24i Bolt 1
Part Description Qty
25i Washer 1
26i Wood Screw 2
27i Washer 1
28i Thread Hanger 1
29i Column Cap 1
30i Upper Spool Rest Rod 1
31i Bolt 1
32i Washer 1
33i Column Pipe Connector 1
34i Bolt 2
35i Nut 1
36i Lower Spool Rest Rod 1
37i Washer 1
38i Nut 1
39i Spool Vibration Stopper 2
40i Spool Pin 2
41i Spool Rest 2
42i Spool Mat 2
43i Thread Guide Hole 1
44i Thread Guide Hole 1
46i Spool Support 1
47i Nut 1
Note: When ordering parts for this component use the sufx “i”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 36 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 37
I - BOBBIN WINDER & THREAD STAND UNIT ASSEMBLY DRAWING
Page 37For technical questions, please call 1-800-444-3353.SKU 3914
Page 38
J - MOTOR PARTS LIST
Part Description Qty
1j Pulley Safety Cover 1
2j Bolt M5 x 10 1
3j Spring Washer Ø5 1
4j Flat Washer 1
5j Nut M12 1
6j Gear Spring Washer Ø12 1
7j Set Screw 5 x 14 1
8j Pulley 1
9j Inner Cover 1
10j Bolt 1
11j Lock Nut M10 1
12j Bracket 1
13j Stop Spring Ø9 1
14j Arm Pin 10 x 55 1
15j Wing Nut M6 1
16j Lock Washer 1
17j Coil Washer 1
18j Taper 1
19j Clutch Arm 1
20j Adjustment Bolt M6 x 10 1
21j Brake Shoe 1
22j Bearing 6202 1
23j Clutch Sleeve 1
24j Clutch Shaft 1
25j Flat Rubber Washer 1
26j Clutch Plate 1
27j Lock Nut 1
28j Flat Washer Ø14 1
29j Bolt M6 x 10 1
30j Clutch Cork 1
31j Round Spring Plate 1
32j Flywheel 1
33j Fan Blade 1
34j Flat Washer Ø6 1
35j Spring Washer Ø6 1
36j Bolt M6 x 10 1
Part Description Qty
37j Bearing 6203 1
38j Rotor 1
39j Bolt M6 x 15 1
40j Lock Washer 1
41j Bearing Pressing Plate 1
42j Stator 1
43j Housing 1
44j Plastic Cap 1
45j Nut M10 2
46j Spring Washer Ø10 2
47j Flat Washer Ø10 2
48j Belt Adjustment Bolt M10 x 140 1
49j Mount Hinge Pin 10 x 84 1
50j Vibration Absorbing Rubber Gasket 3
51j Table Mount 1
52j Nameplate 1
53j Rivet 2 x 6 1
55j Spring Washer Ø4 1
56j Bolt M4 x 8 1
57j Clamp of Capacitor 1
58j Capacitor 1
59j End Cover 1
60j Spring Washer Ø4 1
61j European Style Socket 1
62j European Style Plug 1
63j ON/OFF Control Box 1
64j Thrust Spring Ring 1
65j Cushion Plate 1
66j Bolt M6 x 20 (not shown) 2
67j Nut M8 3
68j Spring Washer Ø8 3
69j Flat Washer Ø8 3
70j Carriage Bolt 3
71j Belt (size 41) (not shown) 1
72j Wood Screw (not shown) 4
73j Flat Washer (not shown) 4
Note: When ordering parts for this component use the sufx “j”.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts.
Page 38 For technical questions, please call 1-800-444-3353. SKU 3914
REV 10b
Page 39
J - MOTOR ASSEMBLY DRAWING
Page 39For technical questions, please call 1-800-444-3353.SKU 3914
Page 40
LIMITED 90 DAY WARRANTY
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality
and durability standards, and warrants to the original purchaser that this product is free from
defects in materials and workmanship for the period of 90 days from the date of purchase. This
warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or
accidents, repairs or alterations outside our facilities, criminal activity, improper installation,
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death,
injuries to persons or property, or for incidental, contingent, special or consequential damages
arising from the use of our product. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation of exclusion may not apply to
you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the complaint
must accompany the merchandise. If our inspection veries the defect, we will either repair or
replace the product at our election or we may elect to refund the purchase price if we cannot
readily and quickly provide you with a replacement. We will return repaired products at our
expense, but if we determine there is no defect, or that the defect resulted from causes not
within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specic legal rights and you may also have other rights which
vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY
DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER
THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR
SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER
AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS
SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE
BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS
TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR
HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Page 40 For technical questions, please call 1-800-444-3353. SKU 3914
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