Harbor Freight Tools 3914 Operation, Mounting the Bobbin Winder, Installing the Belt Covers

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Cap over the end of the Upper Spool Rest Rod.

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.

13.Set the Bobbin Winder to the ‘ON’ Position - See Bobbin Winder Operation on the following page.

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.

15.Set the Base (1i) aside and drill pilot holes for each of the two marked locations. Reposition the base and secure using two Wood Screws (26i) and

Washers (27i). Leave the Screws just loose enough to allow the Base to slide.

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.

Installing the Belt Covers

1.Install the Front Belt Cover (4h) over the Sewing Machine Hand Wheel (7b), using the Belt Cover Support (11h), the Belt Cover Bolts (10h, 12h), and the Belt Cover Cap (5h).

2.To install the Rear Belt Cover (7h), align 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

REV 07a, 10b

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

SKU 3914

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Contents For technical questions or replacement parts, please call Single needle industrial Sewing MachineSpecifications Safety Warnings PrecautionsRead all instructions before using this Tool Save This ManualFor technical questions, please call Sewing Safety Precautions Grounding Grounded Tools Tools with Three Prong PlugsExtension Cords Unpacking Table a25’ 50’ 75’ 100’ 150’ Assembly Mounting the Motor Bobbin Winder Assembly Aligning the PulleysAdjusting the Belt Tension Mounting the Thread Stand SKU For technical questions, please callInstalling the Belt Covers OperationMounting the Bobbin Winder Attaching the Needle Bobbin Winder OperationModerate to slow speeds for the first 15 minutes of use OFF PositionWith the thread Threading the Top Thread DetailAdjusting the Stitch Length Adjusting the Needle Thread TensionAdjusting the Bobbin Thread Tension Raising the Presser FootSetting the Presser Foot Pressure Adjusting the Feed TimingAdjusting Feed Dog Height Adjusting Needle-to-hook Timing Adjusting the Presser Bar Height Adjusting the Height of the Knee LifterMaintenance Adjusting Sewing Speed with Pulleys sold separatelyMotor Wiring Diagram ARM BED Parts List Part Description QtyARM 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

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