Harbor Freight Tools 3914 operating instructions Adjusting Needle-to-hook Timing

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Feed Lifting

 

 

Shaft Crank (1e) Bolt (2e)

0.03”~0.033” (

)

 

0.028”~0.031” (

)

 

0.037”~0.041” (

)

Feed Bar Body

Subassembly (4e)

Figure 32

1.Loosen the Bolt (2e) of the Feed Lifting Shaft Crank (1e).

2.Move the Feed Bar Body Subassembly (4e) up or down to make the adjustment.

3.Tighten the Bolt (2e), being careful not to overtighten.

Adjusting Needle-to-hook Timing

 

Needle

Rubber Plug (46a)

Bar

(31c)

&

 

Bolt (28c)

 

Needle

 

Bar Lower

Hook

Bushing

Blade

(27c)

Point

Needle Bar

 

(31c)

 

Figure 33

Rotating

Hook (20c)

3.When using a DBX1 needle, align to marker line “A” on the Needle Bar (31c) with the bottom end of the Needle Bar Lower Bushing (27c), then tighten Bolt (28c).

When using a DAX1 needle, align to marker line “B” on the Needle Bar (31c) with the bottom end of the Needle Bar Lower Bushing (27c), then tighten the Bolt (28c).

4.When using a DBX1 needle, loosen Rotating Hook (20c) Set Screws, turn the Hand Wheel, and align the marker line “B” on the Needle Bar (31c) with the bottom end of the Needle Bar Lower Bushing (27c).

When using a DAX1 needle, align the marker line “D” on the Needle Bar (31c) with the bottom end of the Needle Bar Lower Bushing (27c).

5.After making the adjustments in steps 3 and 4, align the Hook Blade Point on the Rotating Hook (20c) with the center of the Needle.

Provide a clearance of .001” to .004” (0.04 to 0.1 mm) between the Needle and the Hook Blade Point. This clearance is less than 1/64” (almost touching). Securely tighten the Set Screws on the Rotating Hook. If the clearance is too small, the tip of the Hook Blade Point will be abraded. If it is too large, it will lead to skipped stitches.

1.Turn the Hand Wheel (7b) to bring the Needle Bar down to the lowest point of its stroke.

2.Remove and set aside the Rubber Plug (46a). Loosen the Bolt (28c).

 

 

REV 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 MachineRead all instructions before using this Tool SpecificationsSafety Warnings Precautions 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 Moderate to slow speeds for the first 15 minutes of use Attaching the NeedleBobbin Winder Operation OFF PositionWith the thread Threading the Top Thread DetailAdjusting the Bobbin Thread Tension Adjusting the Stitch LengthAdjusting the Needle 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

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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