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

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.

One of the standout features of the 3914 model is its powerful 212cc engine, which delivers a peak output of 3500 watts and a running output of 3000 watts. This allows users to power multiple devices simultaneously, making it suitable for everything from household appliances during power outages to tools on construction sites. The generator's 4-gallon fuel tank provides an impressive run time of around 11 hours at a 50% load, ensuring that users can rely on it for extended periods without frequent refueling.

In terms of technology, the Harbor Freight Tools 3914 incorporates a user-friendly control panel that includes two 120V AC outlets, a 12V DC outlet, and a circuit breaker for added safety. The 120V outlets are perfect for connecting various tools and devices, while the DC outlet can be used to charge batteries and other electronic devices. The generator also features an easy-to-read fuel gauge, which helps users monitor fuel levels and plan refueling accordingly.

Furthermore, the generator is equipped with a recoil start system, allowing for quick and straightforward operation. Additionally, its lightweight construction, combined with two carrying handles, ensures that it can be transported with ease, making it ideal for camping trips, outdoor events, or emergency use at home.

Safety is also a priority with the 3914 model. It comes with built-in low oil shutdown technology, which automatically turns off the engine when oil levels are low, preventing potential damage and prolonging the life of the generator. The generator's quiet operation is another significant advantage, ensuring that it can be used without causing excessive noise disturbances.

Overall, the Harbor Freight Tools 3914 portable generator stands out for its powerful performance, user-friendly features, and reliable safety mechanisms. Its combination of efficiency and portability makes it a valuable asset for anyone in need of reliable power on the go.
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