11304001 Crank for Jack F4 Industrial Sewing Machine

11304001 Crank for Jack F4

This crank connects the main drive shaft to the needle bar mechanism, converting rotary motor motion into the up-down needle movement that forms each stitch.

Fits

• Jack F4 industrial single needle sewing machine

Why Replace It

A worn crank introduces play into the needle bar drive, causing knocking noise, uneven needle timing, or skipped stitches at higher speeds. Replacing it restores smooth, precise needle drive.

अक्सर पूछे जाने वाले प्रश्न

My machine makes a knocking noise at speed — could this be the cause?
Yes, a worn crank is a common source of knocking or clicking noise, especially noticeable when running the machine at higher RPM.