Serger / coverstitch reference
Needles, bobbins, feet and other details for this model. Check the requirements before choosing parts.
Before choosing a part
Start with these documented details. Read the requirements with each answer before choosing a needle, bobbin or foot.
Use INSPIRA overlock needles, system ELx705; do not use a standard household sewing-machine needle of any size or type.
Requirements and sources →The manual specifies ELx705 sizes 12/80 and 14/90; its fabric table assigns 12/80 to light fabric and 14/90 to medium or heavy fabric.
Requirements and sources →The differential-feed ratio range is 0.6–2.0.
Requirements and sources →Not yet confirmed here: Manufacturer accessory group, Presser-foot shank type, Foot interface / generation, Bobbin type / class, Bobbin material, Bobbin diameter, Bobbin height, Hook type, Maximum stitch / zigzag width, Feed system, Bobbin loading direction. What is still to confirm →
Other names, regional versions and related models have not been confirmed here. A shared manual, product line or accessory group does not identify the machine's family.
Keep the exact documented system and size conditions, needle positions and original disconnection sequence. Do not infer another needle system or household-machine equivalence.
Documents and page references →Keep the ordered safety and extra-lift foot-change conditions with the procedure. Pressure and lift specifications do not establish optional, adapter or third-party foot fit.
Documents and page references →Follow the original preparation, threading order and breakage recovery instructions with the complete illustrated procedure.
Documents and page references →Read each stitch/setup condition with its own specification. Listed ranges and maximum speed are not a promise for every fabric, accessory or setup.
Documents and page references →Keep each stitch/setup condition and use the complete stitch-selection and threading instructions. A count alone does not establish a usable setup.
Documents and page references →Keep the manual’s when-overedging applicability and original fabric/setting conditions. Do not turn these ranges into unrestricted settings for other stitch modes.
Documents and page references →Keep the original safety, lint-removal and oiling instructions. These owner-care references do not authorize internal servicing or substitute lubricants.
Documents and page references →Manuals, parts books & more
Publisher links below distinguish a matched file from a listing.
Choose the document for your task: an instruction manual, service manual, parts list and accessory guide answer different questions.
About this document & page references →
InstructionCited retained manual: Page references refer to the retained source identified here. Current OEM downloads checked on 2026-10-14 differ from that file; no matching download or page-jump link is offered for this manual. The original is retained privately and is not hosted by SewIndex.
Read the model-specific requirements with each answer before choosing parts.
Use INSPIRA overlock needles, system ELx705; do not use a standard household sewing-machine needle of any size or type.
The manual specifies ELx705 sizes 12/80 and 14/90; its fabric table assigns 12/80 to light fabric and 14/90 to medium or heavy fabric.
Turn power off and unplug, raise the needles fully, put thick fabric under the foot and lower the needles halfway into it. While holding the needles, loosen but do not remove the clamp screw, insert the replacement fully with its flat surface to the back, then tighten securely without overtightening.
The machine specification supports one, two or three needles.
With power off and unplugged, raise the presser foot and turn the handwheel toward you until the needles are highest. Press the red ankle button, raise to extra lift, and remove the foot. While still at extra lift, place the replacement foot pin under the ankle groove, lower the foot, and press the red button so it snaps into place.
Use 2.5 for normal conditions. For less pressure turn counter-clockwise within 2.5 to 1; for more turn clockwise within 2.5 to 5, and always test on a fabric sample before the garment.
Specifications apply to the named model and document edition. Read any setup, fabric or safety requirements with the answer.
Switch the machine off (0) before threading or re-threading the needles. Thread the upper looper first, then the lower looper, followed by the needles from right to left.
Switch the machine off (0) before threading or re-threading the needles. If a looper thread breaks, unthread the needles and loopers, then thread the upper looper, lower looper, and needles from right to left in that order.
Use 1.0 for normal overlock stitching. When overedging stretch fabric such as knits or jersey, use 1.0–2.0 depending on desired gathering. When overedging light woven or loosely knit fabric, use 0.6–1.0 and apply gentle tension in front of and behind the foot. Test different settings before the garment.
Turn power off and unplug, open the front cover, remove lint with the lint brush, then close the cover and wipe the exterior with a soft cloth. Clean the touch screen with a clean, soft, damp cloth.
Turn power off and unplug, oil the diagram-marked moving parts often with the supplied sewing-machine oil, and wipe away excess oil before sewing.
Nominal widths are 6 mm with the left or both overlock needles, 4 mm with the right needle, and 9 mm with the chainstitch needle. Cutting-width adjustment ranges are 5–7 mm left, 3–5 mm right, and 8–10 mm chainstitch; the standard dial setting is 6.0. The specification separately lists coverstitch width as 3–6 mm.
The specification range is 1.0–4.0 mm; the manual directs 4 mm for heavyweight fabric and 2 mm for lightweight fabric.
Sewing speed is 1,100 stitches per minute.
The differential-feed ratio range is 0.6–2.0.
Presser-foot rise is 4.5 mm.
The machine specification supports two, three, four or five threads.
Use the full source procedure and its safety precautions. A short referenced answer is not a substitute for service documentation or qualified electrical/mechanical repair.
Service-manual availability and service-only procedures remain unestablished unless separately cataloged and reviewed.
Answers use the existing manual research and its page references. They do not cover every machine detail or confirm replacement products.
An unanswered question does not mean a part is incompatible. We have not confirmed enough information to recommend it.
Presser foot — Third party compatibility: Not established Full recorded limit & conditions →
Other names, regional versions, production history, further specifications and documents are not fully covered here. Their absence is not a “none exist” finding.
These are research questions, not claims that the missing relationship exists.
Each answer links to its exact evidence passage below. Open a reference to see the document and page. These links identify the source; they do not include the full manual or its diagrams. Document access is consolidated in the OEM library above.
Published by PFAFF
Checked against the document text.
Document and available links →About this document →PDF page 1
The retained OEM cover explicitly names coverlock 4.0 and binds this manual to the separately accepted exact PFAFF identity.
PDF page 11
coverlock 4.0 safe foot-change sequence and exact machine-specific needle system, sizes and installation. No generic foot-fit inference.
PDF page 14
coverlock 4.0 threading order, breakage recovery and fabric-conditioned needle-size table. Visually verified words affected by legacy font encoding are not used as replay fragments.
PDF page 39
coverlock 4.0 stitch-width, pressure and fabric-conditioned stitch-length controls; visually verified nominal right-needle and chainstitch widths remain in the answer but are not replay fragments because of legacy font encoding.
PDF page 40
coverlock 4.0 fabric-conditional differential-feed settings and test-sew requirement.
PDF page 43
coverlock 4.0 cleaning and non-numeric owner-oiling guidance; power-disconnect warnings were visually verified where legacy font encoding prevents exact native replay.
PDF page 45
coverlock 4.0 exact specifications; stated ranges and counts remain separate from stitch-selection instructions.
PDF page 2
Exact retained physical2 safety page visually verified by native writer: switch machine off(0) before needle-area adjustment, including threading. The leading off clause is partially garbled in the native extraction; retain its exact hash and clean context fragments, no decoder or OCR authority. Image source establishes the off(0) prerequisite. No printed page number asserted; no blanket unplug-for-threading inference.
Alex Shick · Founder and editor. Corrections managed by Alex Shick.
This PFAFF coverlock 4.0 guide is based on documents, with AI assistance to organize the information. We have not tested or repaired the machine.
Check the document edition with each answer. A source review date is not a machine inspection date or a promise that the manual is the latest edition.
Contact the SewIndex team or report a correction ↗
The correction address has been tested and its monitoring confirmed. We cannot promise a response or accept every suggested change.
Report an error with the model, document and page · About SewIndex and our method
Answers come from the documents named on this page. They describe those editions, and may not cover later changes to the machine or manual.
Source review: This record reuses the retained 18-answer source acceptance and its independently reviewed two-answer threading-safety correction. Page references identify the cited retained manual; current manual downloads have not been matched.