Check the conditions alongside each answer. Foot attachment, shank type and adapter requirements are separate; one does not establish universal accessory fit.
Needles and threading
Which needle type applies in each position?
conditional
Use 130/705H in the right needle position. The left position is listed as 130/705H (JL×2), with JL×2 specifically directed for heavyweight materials.
Preserve the right/left distinction; do not generalize JL×2 to both positions or all fabrics.
Turn power off, fully raise the needles, lower or remove the presser foot, then insert the right needle first and the left needle the same way, fully upward with each flat side away from you.
Tighten the needle clamp screws securely after full insertion.
With power off, raise the foot and needles, release the foot with point C, then place the replacement pin directly under holder groove D and lower the lifting lever to engage it.
This establishes only the documented pin-and-groove mechanism, not universal or third-party foot fit.
What preparation and order does threading require?
conditional
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 before opening covers to thread the loopers.
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 for looper threading; do not substitute the separate MO-644DN-only method.
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.
Turn power off and unplug before working in the looper and needle areas.
How are 4 mm and 6 mm three-thread stitches configured?
conditional
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.
Cut off and remove the unused former needle thread; turn power off before changing needles.
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.
Trial-sew after adjustment; settings depend on fabric and whether waves or puckering need correction.
Regularly remove collected dust and fluff. The machine requires very little lubrication; lubricate only the illustrated points now and then.
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.
How is the MO-654DEN lower looper threaded?: 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.
What happens after lower-looper thread breakage?: 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.
MO-654DEN only:
Holding the thread loosely with the left hand
upper and lower loopers just cross
Thread the lower looper and then the needles.
Which needle type applies in each position?: Use 130/705H in the right needle position. The left position is listed as 130/705H (JL×2), with JL×2 specifically directed for heavyweight materials.
How are the needles installed?: Turn power off, fully raise the needles, lower or remove the presser foot, then insert the right needle first and the left needle the same way, fully upward with each flat side away from you.
flat side away from you
Right-hand needle
130/705H
Left-hand needle
130/705H (JL × 2)
heavy-weight materials
How does the documented presser foot attach?: With power off, raise the foot and needles, release the foot with point C, then place the replacement pin directly under holder groove D and lower the lifting lever to engage it.
How is extra presser-foot lift used safely?: The extra-lift position provides more space for heavyweight material between the foot and throat plate.
When using the extra lift (B), do not run the machine or turn the handwheel.
Be sure to turn the power switch OFF.
comes exactly under the groove in the holder (D)
How are the needles installed?: Turn power off, fully raise the needles, lower or remove the presser foot, then insert the right needle first and the left needle the same way, fully upward with each flat side away from you.
How does the documented presser foot attach?: With power off, raise the foot and needles, release the foot with point C, then place the replacement pin directly under holder groove D and lower the lifting lever to engage it.
What preparation and order does threading require?: 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.
How is the MO-654DEN lower looper threaded?: 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.
What happens after lower-looper thread breakage?: 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.
How are 4 mm and 6 mm three-thread stitches configured?: 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.
Switch the sewing machine off
changing needle
changing presser foot
Always unplug the machine from the electrical outlet when removing covers, when covers are opened to thread the loopers, when lubricating
How are 4 mm and 6 mm three-thread stitches configured?: 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.
4 mm wide 3-thread Overlocking
Remove the left-hand needle.
6 mm wide 3-thread Overlocking
Remove the right-hand needle.
How should the machine be cleaned and lubricated?: Regularly remove collected dust and fluff. The machine requires very little lubrication; lubricate only the illustrated points now and then.
Main switch off “O”. Disconnect machine from electricity supply.
dust and fluff
requires very little lubrication
lubricate only the points illustrated
What preparation and order does threading require?: 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.
Be sure to turn the power switch OFF.
Open the looper cover and cloth plate.
Upper looper thread (Blue)
Lower looper thread (Red)
Right hand needle thread (Green)
Left hand needle thread (Yellow)
Which differential-feed settings apply?: 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.
Differential feed (MO-654DEN)
After adjusted, be sure to sew on trial.
N → 1.5 - 2
N → 0.7
Unknown is not incompatible. A missing answer means the current official evidence does not support one yet.
Specifications
Documented machine facts
Multiple cited representations for one field share one row. SewGraph preserves every value and exact proof passage; it does not guess which representation is “raw” or “normalized” when the public projection does not label that distinction.
looper
looper system
JUKI upper/lower looper system with MO-654DEN lower-looper threader
Open the exact OEM PDF page or captured HTML edition when a safe destination exists; otherwise SewGraph labels the OEM support-page fallback honestly.
MO-644DN and MO-654DEN instruction manual
instruction
Open official source destination · 1 unique proof passage:Proof E1
Evidence library
7 exact proof passages from 1 OEM document
Every passage below says exactly what visible fact it proves. Repeated references to the same locator are counted once; identity evidence never counts as compatibility evidence.
Open exact proof passages · 7 unique proof passages
Official OEM PDF
What this passage proves
Identity — printed machine name: MO-654DEN
MO-654DEN
IMPORTANT:
Read all safety regulations carefully and under-
stand them before using your sewing
looper fact — looper system: JUKI upper/lower looper system with MO-654DEN lower-looper threader
knife fact — knife system: integrated upper knife and adjustable lower-knife cutting-width system
View with looper cover open
CAUTION :
Be sure to turn off the power switch before
opening the looper cover.
Upper looper
Upper knife
Overlock width selection knob
Lower knife
Lower knife setscrew Lower looper
Lower looper threader (MO-654DEN)
To attach the presser foot, place it so that presser foot pin comes
exactly under the groove in the holder (D). Lower the presser
foot lifting lever and the presser foot will en gage automatically.
0 supported answers and 11 answers with conditions or remaining limits. Evidence coverage is not a probability of accuracy.
Unresolved owner questions (1)
Do generic or third-party feet universally fit?: Not established — Not yet verified: The reviewed manual does not establish universal or third-party presser-foot compatibility.