Harbor Freight Tools 3914 operating instructions Adjusting the Belt Tension

Page 10
Figure 13
REV 04c, 05d, 07g, 10b

and turn it around. Move the belt by hand to verify that it is aligned and tracking correctly.

2.Once you have the Pulleys aligned, remove the Belt from the Sewing Machine Hand Wheel (7b), and tighten its Set Screws (8b). Replace the Pulley and tighten the Motor Set Screw (7j).

3.Attach the Pulley Safety Cover (1j) over the motor Pulley (8j), using the Bolt (2j), Spring Washer (3j), Flat Washer (4j), and Lock Nut (5j).

Adjusting the Belt Tension

Upper Nut (45j)

Motor Housing

Flange

Lower Nut (45j)

Belt Adjustment

Bolt (48j)

Motor

Belt (71j)

Figure 11

1.To tighten the Belt (71j) tension, turn the lower Nut (45j) on the Belt Adjustment Bolt (48j) counterclockwise, moving the nut down towards the end of the bolt enough so that the motor hangs as low as its weight allows. Turn the upper Nut (45j) counterclockwise until it tightens against the Motor Housing Flange. The proper tension is reached when the Belt can only be pushed in 1/2 inch. Test the Belt tension. If it needs to be tighter, move the lower Nut and push the motor down. Tighten in place with the upper Nut.

Caution: Do not tighten the Belt so much that the left side of the Sewing Machine begins to lift up from the Oil Pan.

2.Once the Belt is the proper tension, tighten both Nuts against the Motor Housing Flange to hold the motor in place.

3.Install the Pulley Safety Cover (1j) over the motor Pulley (8j), using the Bolts (2j), Flat Washers (4j), Spring Washers (3j), and Nuts (5j).

Back of Tabletop

Thread Stand hole

 

 

 

Machine Rest Pin (19h) hole

 

 

 

Pre-drilled Engine

 

 

 

mounting holes

 

 

Legs

Sewing Machine

Legs

Drawer

Opening

 

 

 

Pulley Belt Slot

 

 

 

Front of Tabletop

 

Possible ON/OFF Control Box locations

ON/OFF Control Box shown mounted on right from underside of tabletop.

Figure 12

4.Mount the ON/OFF Control Box (63j) under the Tabletop, in one of the locations shown above, using the Wood Screws (72j) and Flat Washers (73j).

5.Connect the Treadle Joint Assembly

(from the Tabletop

To adjust

 

3929 - sold

length:

 

separately) to the

loosen nut

Clutch

here,

end of the motor

slide

Arm

Clutch Arm (19j),

bars

(19j)

 

using the nut and

as

Treadle Joint

needed,

Assembly

bolt on the end of

then

and Treadle

the Joint Assembly.

tighten

Pedal

Adjust the length

nut.

(Tabletop

 

and/or location of

 

#3929 - sold

 

separately)

the components if

 

 

 

needed.

 

 

Page 10

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 Grounded Tools Tools with Three Prong Plugs GroundingExtension Cords Table a Unpacking25’ 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 callOperation Installing the Belt CoversMounting 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 FootAdjusting the Feed Timing Setting the Presser Foot PressureAdjusting 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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