JUKI MO-654DEN

• Turn power off and unplug before opening covers to thread the loopers.

Fully raise the support rod, open the looper cover and cloth plate, turn the handwheel toward you until the needles are fully raised, raise the upper knife, then thread upper looper blue, lower looper red, right needle green and left needle yellow in that order.

• Turn power off and unplug for looper threading; do not substitute the separate MO-644DN-only method.

For MO-654DEN, raise the needle fully and lower the threading-device lever, guide thread through its guide and slit, hold it loosely in the left hand, and turn the handwheel until the upper and lower loopers just cross; the device then returns automatically before the lower-looper eye is threaded and the thread is routed beneath the foot.

• Turn power off and unplug before working in the looper and needle areas.

If the lower-looper thread breaks or slips, cut both needle threads at the needles, remove the cut needle threads, then thread the lower looper before rethreading the needles.

• Cut off and remove the unused former needle thread; turn power off before changing needles.

For 4 mm three-thread overlocking, remove the left needle and thread upper looper, lower looper and right needle. For 6 mm, remove the right needle and thread upper looper, lower looper and left needle.

• Trial-sew after adjustment; settings depend on fabric and whether waves or puckering need correction.

For MO-654DEN, use N toward 1.5–2 for wool knit, thick hand-knit and other stretchy fabrics; N toward 1.5 for thin knit and jersey; N for woven fabrics; and N toward 0.7 for georgette, linen, satin and poplin.

• This setup is limited to a single lightweight layer; set differential feed to N when sewing without differential feed.

To gather one layer of lightweight fabric, set stitch length to maximum 4 and differential feed to 1.5–2.

• Switch off and disconnect from electricity before cleaning or lubricating; the diagram, not this summary, controls exact oiling points. Follow the manual's oil precautions: wash exposed eyes or skin immediately, seek medical advice if swallowed, keep oil away from children, and dispose of it according to applicable law.

Regularly remove collected dust and fluff. The machine requires very little lubrication; lubricate only the illustrated points now and then.

• The retained shared manual specification table gives left-hand needle6mm, right-hand needle4mm and roll hemming2mm as different configurations. Existing three-thread needle-removal/threading conditions remain separately authoritative.
• This is overlocking/rolled-hem width, not maximum zigzag width, a continuous range, needle spacing, presser-foot clearance or an attachment-fit grant.
• Applies to the exact accepted MO-654DEN within the retained36-page OEM manual; edition/region not established. No sibling identity, revision fanout or PDF distribution/sale permission.

overlocking-width system: left needle 6 mm; right needle 4 mm; rolled hem 2 mm

• The existing accepted core value describes the retained manual's knife assembly; page6 labels upper/lower knives and page13 expressly describes lower-knife position adjustment for cutting width.
• Turn power OFF before opening the looper cover; the safety page also requires unplugging for removed/open covers, looper threading and stated user servicing. Consult the full diagrams and procedures.
• No knife part number, replacement interchangeability, cutting-width range, new operating sequence, aftermarket fit or machine-wide clearance inferred.

integrated upper knife and adjustable lower-knife cutting-width system

• The page6 diagram names upper/lower loopers and expressly marks the lower-looper threader MO-654DEN. Existing exact MO-654DEN threading guidance remains separate; exclude the page20MO-644DN-only method.
• Turn power OFF and unplug before opening covers for looper threading or stated user servicing; consult the complete source procedure.
• No looper part number, bobbin/hook architecture, cross-model replacement equivalence, automatic air-threading feature or retail-product fit established.

JUKI upper/lower looper system with MO-654DEN lower-looper threader