Harbor Freight Tools 3914 operating instructions Adjusting the Presser Bar Height

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Adjusting the Presser Bar Height

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).

2.Manually adjust the Presser Bar height, and the angle of the Presser Foot.

3.After adjusting, securely tighten the Set Screw and replace the Rubber Plug.

Adjusting the Thread Take-up Stroke

Thread Take-up Thread Guide (35a)

Spring (9a)

Thread Guide Bolt (36a)

 

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:

a.When sewing heavy weight materials, move the Thread Guide (35a) to the left to increase the length of thread pulled out by the Thread Take-up Spring (9a).

b.When sewing lightweight materials, move the Thread Guide (35a) to the

REV 10bright to decrease the length of thread

pulled out by the Thread Take-up 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 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).

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).

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 callSave This Manual SpecificationsSafety Warnings Precautions Read all instructions before using this ToolFor 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 OFF Position Attaching the NeedleBobbin Winder Operation Moderate to slow speeds for the first 15 minutes of useWith the thread Detail Threading the Top ThreadRaising the Presser Foot Adjusting the Stitch LengthAdjusting the Needle Thread Tension Adjusting the Bobbin Thread TensionAdjusting 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

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