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Single needle induStrial
Sewing Machine
Model 3914
Set up and Operating inStructiOnS
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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
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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 3 Machine Dimensions 20- / ” L x 10” H 4 - 2 Screwdrivers- 3 Bobbins- Small lubricating bottle with tip- Spare needles (size 90/14) Accessories - Power Switch Table Stand Kit Table S
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inhibit rust. Always lock up tools and the machine work surface before keep out of reach of children. plugging it in. 5. use the right product for the job. Do 11. avoid unintentional starting. Be sure not attempt to force a small product the switch is in the Off position when not or attachment to do the work of a in use and before plugging in. larger industrial tool. There are certain 12. Stay alert. Watch what you are doing, applications for which this product was use common sense. Do
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to supply the correct current to the 2. Do not place your fingers into the thread tool without heating up. Otherwise, the take-up cover while the machine is extension cord could melt and catch fire, operating. or cause electrical damage to the tool. 3. Never leave the machine running and This tool requires use of an extension unattended. cord with up to 10 amps capability (up to 50 feet), with wire size rated at 18 4. During operation, never place your head, awg . Longer extension cords
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2. The grounding prong in the plug is grOunding connected through the green wire inside tO preVent the cord to the grounding system in the electric ShOcK tool. The green wire in the cord must and death FrOM incOrrect be the only wire connected to the tool’s grOunding wire grounding system and must never be cOnnectiOn: attached to an electrically “live” terminal. Check with a qualified electrician (See 3-prong plug and Outlet.) if you are in doubt as to whether 3. The tool must be plu
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the required minimum cord size. (See Symbology t able a.) Double Insulated 6. If you are using an extension cord outdoors, make sure it is marked with the Canadian Standards Association suffix “W-A” (“W” in Canada) to indicate it is acceptable for outdoor use. Underwriters Laboratories, Inc. 7. Make sure the extension cord is properly wired and in good electrical condition. Volts Alternating Current Always replace a damaged extension V~ cord or have it repaired by a qualified Amperes el
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of the machine, depending on the user’s aSSeMBly preference. Sewing Machine Hinge Indentations in Tabletop t able Stand and Back of t op (not provided) power Sewing Switch Machine Motor Knee lifting arm for presser Foot Oil Pan (1g) Hinge (1h) Figure 1 Figure 3 The assembly instructions describe mounting 2. Seat the Oil Pan (1g) on the Rubber the Single-Needle Sewing Machine (Model Pads and Cushions in the Tabletop 03914) to the Table Stand (Model 03929), not opening. included. In or
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Mounting the Motor Knee Press Oil Pan Magnet Lifter Rod (2g) (22g) note: The Motor is heavy. You will need a helper to hold the motor in place while Oil Sight tightening the Nuts (67j) on the Carriage Window (1f) Bolts (70j) in step 5 on the following page. Motor Rotation Switch always keep to right Hand Wheel (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.
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Sewing Machine Carriage Bolts (70j), Hand Wheel Flat Washer (69j), Belt (71j) (7b) Spring Washer (68j), Nut (67j) Set Screws (8b) (One on each side of the Pulley) Figure 9 Main Shaft (32b) 5. Mount the Motor to the underside of the tabletop using the Carriage Bolts (70j), Slot in Tabletop for belt Flat Washers (69j), Spring Washers Bobbin Winder Assembly Figure 7 (68j), and Nuts (67j). Finger tighten only. 3. Slide the Sewing Machine Hand Wheel (7b) onto the Main Shaft (32b) of the al
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and turn it around. Move the belt by hand caution: Do not tighten the Belt so much to verify that it is aligned and tracking that the left side of the Sewing Machine correctly. begins to lift up from the Oil Pan. 2. Once you have the Pulleys aligned, 2. Once the Belt is the proper tension, remove the Belt from the Sewing tighten both Nuts against the Motor Machine Hand Wheel (7b), and tighten Housing Flange to hold the motor in its Set Screws (8b). Replace the Pulley place. and tighten th
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Mounting the thread Stand 7. If needed, bend the Spool Support (46i) so it slides easily over the Lower Spool Thread Hanger Rest Rod (36i), then slide it over the Upper Spool (28i) Rest Rod Lower Spool Rest Rod, about halfway Column Pipe (30i) down. Insert a Bolt (31i) and Nut (47i) Connector (33i) through the Support. Lower Spool Spool Rest Rod Pins note: The Support has tabs that hold onto (36i) (40i) the corners of the Nut to make tightening easier. When assembling, place the
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Cap over the end of the Upper Spool Washers (27i). Leave the Screws just Rest Rod. loose enough to allow the Base to slide. Less than 1/8” gap Mounting the Bobbin w inder between Belt (71j) and Wheel (3i) The Bobbin Winder is used to wind Belt (71j) 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 w inder & thread S
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moderate to slow speeds for the first right. Insert the Needle and push it up 15 minutes of use. until it will go no farther. 5. While holding in place, securely tighten warning: Shut the machine off the Bolt. completely before working around the needle or other moving parts. Bobbin w inder Operation BaSic SettingS The Bobbin Winder is used to wind thread onto the Bobbin. The Bobbin You will need to make the following Winder has two positions, ‘ON’ and adjustments on a regular basis whe
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w inding thread Onto the Bobbin Setting the Bobbin into the Bobbin case and into the Machine A Thread Guide Hole Bobbin Bobbin Case (21c) (43i) (22c) Thread B from Thread Spool Tension Tension (not Bobbin (17h) Bracket Discs C Figure 22 shown) (18i) (21i) 1. After filling the Bobbin (22c) with thread, Bobbin Winder Shaft (5i) hold it so that the thread exits to the left, and push it into the Bobbin Case (21c). Figure 20 2. Following Figure 22, feed the thread 1. Route the Thread fr
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threading the t op thread Thread Hanger (28i) Set the spool of thread (sold separately) onto the top thread Spool Spool Pin (40i), (the left Spool Pin), and thread it through the eyelet directly Pins above on the Thread Hanger (28i). Guide the thread through the machine, (40i) 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 machin
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pulling it to the top of the machine. Pull adjusting the Bobbin thread both threads behind the Presser Foot, t ension leaving at least 4” of excess thread. adjusting the Stitch length Increase Decrease Tension Tension Stitch Length Tension Bobbin Dial (46e) Adjustment Case (21c) Screw Figure 26 To increase or decrease the stitch length, Figure 28 turn the Stitch Length Dial (46e) to 1. Using a small flathead screwdriver (sold the desired number (in millimeters) as separately), turn the
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Raises adV anced SettingS Presser Foot The Sewing Machine is set at the factory Presser for using with jean weight materials. The Foot Lever following adjustments are needed only when (18d) using the machine for unusual types of fabric Lowers or when changing machine components. Presser These procedures should be performed only Foot by a qualified sewing machine technician. adjusting the Feed t iming Figure 29 1. To raise the Presser Foot, turn the Rotating Hook (20c) Presser Foot Le
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3. When using a DBX1 needle, align to Feed Lifting Shaft Crank (1e) marker line “A” on the Needle Bar (31c) Bolt (2e) 0.03”~0.033” ( ) with the bottom end of the Needle Bar Lower Bushing (27c), then tighten Bolt (28c). 0.028”~0.031” ( ) When using a DAX1 needle, align to marker line “B” on the Needle Bar (31c) with the bottom end of the Needle Bar 0.037”~0.041” ( ) Lower Bushing (27c), then tighten the Feed Bar Body Subassembl
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pulled out by the Thread Take-up adjusting the presser Bar height Spring. c. The normal setting is when the marker on the Thread Guide is aligned with the center of the Bolt. 2. Tighten the Thread Guide Bolt after Rubber Plug (37a) adjusting the Thread Guide. & Presser Bar adjusting the height of the Knee Set Screw lifter (32d) Figure 34 The standard height of the Presser Foot 1. Remove and set aside the Rubber Plug lifted using the Knee Lifter is 0.39 inch (10 (37a), and loosen the
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adjusting Sewing Speed with Maintenance pulleys (sold separately) 1. Advanced Machine adjustments should only be performed by a qualified This machine is a fast running machine. technician. It can be adjusted to a slower running machine by changing the pulley on 2. Check the oil level weekly when the the motor to a smaller diameter pulley. machine is used daily. Add sewing Consult a qualified sewing machine machine oil as required to the high level repair shop to replace the pulley wi
