Juki Pm1 Crack Top [portable] -

The most common cause of a top casing crack on a Juki PM1 is a severe timing collision. The rotary hook (in the base) and the needle (descending from the top) must meet with a clearance of 0.05mm to 0.1mm. If the hook point strikes the needle or the needle bar guard is misaligned, the force transfers up the needle bar assembly, stressing the top head casting. Over time, or with one violent jam, the top cracks near the needle bar bushing.

Once repaired or replaced, use these five preventative measures: juki pm1 crack top