Harbor Freight Tools 3914, Assembly And Operating Instructions Manual, Page: 13 / 29

Page 13 SKU 03914
Adjusting the Presser Bar Height
1. Loosen Set Screw (1) and manually adjust the Presser Bar
height, and the angle of the Presser Foot.
2. After adjusting, securely tighten the Set Screw (1).
Adjusting the Thread Take-up Stroke
1. When sewing heavy weight materials,
move the Thread Guide (1) to the left (A) to
increase the length of thread pulled out by
the Thread Take-up.
2. When sewing lightweight materials, move
the Thread Guide (1) to the right (B) to
decrease the length of thread pulled out by
the Thread Take-up.
3. The normal setting is when the marker line
“C” on the Thread Guide (1) is aligned with
the center of the screw.
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).
1. To adjust the Presser Foot lift up to 0.5 inch (13 mm), adjust the Screw (1).
2. When the Presser Foot lift is adjusted over 0.39 inch (10 mm), be sure that the bottom
end of the Needle Bar (2) does not hit the Presser Foot (3).
This can be manually checked by turning the Hand Wheel.
Maintenance
1. Machine adjustments should only be performed by a qualified technician.
2. Check the oil level weekly when the machine is used daily. Add sewing machine oil as
required to the high level marking.
3. Clean the machine with a clean, damp cloth. Do not use solvents or thinners.
4. When not in use, cover the machine and store in a clean and dry location.