Harbor Freight Tools 3914 Attaching the Needle, Bobbin Winder Operation, OFF Position

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moderate to slow speeds for the first 15 minutes of use.

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 flat area on the shank of the needle.

1.Unplug the Power Cord.

2.Select the proper needle size for the thread count and material being sewn.

3.Turn the Hand Wheel (7b) counterclockwise until the Needle Bar reaches the highest point of its stroke.

Loosen Bolt (25c)

Shank

 

 

 

 

 

 

 

 

 

 

 

Face indented

 

 

 

 

section to right

 

Figure 17Front View

 

 

when inserting

 

 

 

 

Side View

 

needle

 

 

 

right. Insert the Needle and push it up until it will go no farther.

5.While holding in place, securely tighten 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

 

 

 

OFF

Figure 18

Position

 

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

 

 

 

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.

4.Loosen the Bolt (25c) and hold Needle

(23c) with its indented part facing to the

REV 07a, 10b

SKU 3914

For technical questions, please call 1-800-444-3353.

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Contents Single needle industrial Sewing Machine For technical questions or replacement parts, please callSafety Warnings Precautions SpecificationsRead all instructions before using this Tool Save This ManualFor technical questions, please call Sewing Safety Precautions Grounded Tools Tools with Three Prong Plugs GroundingExtension Cords Table a Unpacking25’ 50’ 75’ 100’ 150’ Assembly Mounting the Motor Aligning the Pulleys Bobbin Winder AssemblyAdjusting the Belt Tension SKU For technical questions, please call Mounting the Thread StandOperation Installing the Belt CoversMounting the Bobbin Winder Bobbin Winder Operation Attaching the NeedleModerate to slow speeds for the first 15 minutes of use OFF PositionWith the thread Detail Threading the Top ThreadAdjusting the Needle Thread Tension Adjusting the Stitch LengthAdjusting the Bobbin Thread Tension Raising the Presser FootAdjusting the Feed Timing Setting the Presser Foot PressureAdjusting Feed Dog Height Adjusting Needle-to-hook Timing Adjusting the Height of the Knee Lifter Adjusting the Presser Bar HeightAdjusting Sewing Speed with Pulleys sold separately MaintenanceMotor Wiring Diagram Part Description Qty ARM BED Parts ListARM BED Assembly Drawing Main Shaft Parts List Main Shaft assembly Drawing Stitch Drive Parts List Stitch Drive Assembly Drawing Presser BAR Parts List Presser BAR Assembly Drawing Feed Control Parts List Feed Control Assembly Drawing Lubrication Parts List Lubrication Assembly Drawing Base Assembly Drawing and Parts List Accessories Parts List and Assembly Drawing Bobbin Winder & Thread Stand Unit Parts List Bobbin Winder & Thread Stand Unit Assembly Drawing Motor Parts List Motor Assembly Drawing Limited 90 DAY Warranty

3914 specifications

Harbor Freight Tools 3914 is a robust and versatile portable generator designed to meet the power needs of both professionals and DIY enthusiasts. Featuring a compact design with a durable frame, this generator is built to withstand tough job site conditions while providing reliable power wherever it is needed.

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