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Harbor Freight Tools 3914 operating instructions Adjusting the Presser Bar Height

Models: 3914

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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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Harbor Freight Tools 3914 operating instructions Adjusting the Presser Bar Height, Adjusting the Height of the Knee Lifter
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3914 specifications

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