Sewing-machine answers from manuals and manufacturer documents. About the evidence
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Industrial sewing reference

Singer 20U-112

49 cited answers4 documentsCoverage limits

Needles, bobbins, feet and other details for this model. Check the requirements before choosing parts.

Read instruction manual ↗Find an answer ↓

Before choosing a part

Compatibility essentials

Start with these documented details. Read the requirements with each answer before choosing a needle, bobbin or foot.

Needle system / designation

The manual requires needle Cat.1910-05, system(135x9), only.

Requirements and sources →
Needle sizes by fabric and use

Table4: light materials10(60)/synthetic thread Nm120; medium12–16(80–100)/Nm60; mid-heavy18–19(110–120)/Nm30.

Requirements and sources →
Maximum stitch / zigzag width
Bobbin part / pack reference
Bobbin case / holder

Not yet confirmed here: Manufacturer accessory group, Presser-foot shank type, Foot attachment, Foot holder / mount, Foot interface / generation, Bobbin type / class, Bobbin material, Bobbin diameter, Bobbin height, Hook type, Feed system, Bobbin loading direction. What is still to confirm →

Model & names

Model
Singer 20U-112

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.

What do you need help with?

What does the manual say about threading and thread tension?

Threading →Needle thread tension →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

What foot pressure, lift, knee-lift setup and original accessories are documented?

Pressure adjustment →Knee lift setup →Manual and knee lift mm →Source accessory inventory →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →
More questions (8)

How does the manual specify needle insertion?

Needle insertion →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

Which original bobbin, case, hook, foot and plate numbers are listed for this model?

Original bobbin part →Original bobbin case part →Original hook assembly part →Original assembly part →Original needle plate part →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

How do stitch length, width, needle position and knee controls work within the stated limits?

Manual stitch length and reverse →Manual width regulator →Needle position controls →Knee width control scope →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

Which checks does the manual list for thread breaks, skipped stitches, feeding and unusual noise?

Needle thread breaks →Bobbin thread breaks →Skipping and needle breaks →Feeding and puckering →Noise and escalation →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

What stitch type, application, maximum speed, width, length and needle-bar stroke are documented?

Machine and stitch type →Application →Maximum speed rpm →Maximum stitch bight mm →Maximum stitch length mm →Needle bar stroke mm →Stitch width speed limits →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

What motor setup reference is documented, without assuming my installed electrical configuration?

Manual setup reference →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

Which original knee-lifter inventory is documented?

Original knee lifter inventory →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

Which OEM editions are retained, and which translations are documented only for presence?

Retained manual edition →Additional turkish oem edition →Additional portuguese oem edition →Additional spanish oem edition →
Before you use this answer

Read the exact model-column conditions and full illustrated source. Non-English editions establish document presence only. Standardized interfaces, substitutions and the unresolved original plate conflict remain separate; this navigation does not supply replacement fit.

Documents and page references →

Manuals, parts books & more

Manuals & manufacturer documents

Available documents & sources

Operating manual
Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011
20U/20E combined instruction-and-parts original - Turkish · Literal P/N264338-001 Rev1 2011-09
20U/20E combined instruction-and-parts original - Portuguese · P/N364338-003 Rev0 November2011
20U/20E combined instruction-and-parts original - Spanish · P/N364338-001 Rev0 March2011
Parts references cited within operating manuals
Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011

Cited parts content in an already-listed manual; this is not an additional standalone document.

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 →

Instruction manual

20U/20E combined instruction-and-parts original - Turkish

Singer64 pagesTurkish
Edition and models

Edition: Literal P/N264338-001 Rev1 2011-09

Models referenced here: Singer 20U-112

Retained OEM edition: Recorded for document presence only. Technical answers use the English instruction manual; these editions are not interchangeable translations. A matching public download has not been established for this edition. Its original is retained privately and is not hosted by SewIndex.

About this document & page references →

Instruction manual

20U/20E combined instruction-and-parts original - Portuguese

Singer64 pagesPortuguese
Edition and models

Edition: P/N364338-003 Rev0 November2011

Models referenced here: Singer 20U-112

Retained OEM edition: Recorded for document presence only. Technical answers use the English instruction manual; these editions are not interchangeable translations. A matching public download has not been established for this edition. Its original is retained privately and is not hosted by SewIndex.

About this document & page references →

Instruction manual

20U/20E combined instruction-and-parts original - Spanish

Singer64 pagesSpanish
Edition and models

Edition: P/N364338-001 Rev0 March2011

Models referenced here: Singer 20U-112

Retained OEM edition: Recorded for document presence only. Technical answers use the English instruction manual; these editions are not interchangeable translations. A matching public download has not been established for this edition. Its original is retained privately and is not hosted by SewIndex.

Needle, bobbin & presser-foot details

Read the model-specific requirements with each answer before choosing parts.

Needle

Required catalog and system

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Literal OEM pairing for these exact model rows; not universal equivalence to other named needle systems or unrestricted substitute products.

The manual requires needle Cat.1910-05, system(135x9), only.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 14 · printed page 11

Needle insertion

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Follow Figure10 and retain finger guard; no inferred scarf direction or twin-needle permission.

With power cut off, raise needle bar highest by turning handwheel toward you; fully seat needle with long groove toward the front, then tighten its screw.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 14 · printed page 11

Fabric thread selection

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Needle and thread selection depends on actual fabric/thread. The mid-heavy needle-table column does not expand the Table1 light-to-medium machine application. Footnote allows equivalent sizes of other thread types, not needle-system substitution.

Table4: light materials10(60)/synthetic thread Nm120; medium12–16(80–100)/Nm60; mid-heavy18–19(110–120)/Nm30.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 14 · printed page 11

Original supplied size occurrence

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Source-local supplied/listed occurrences, not a claim that every sewing job requires#14 or that a present machine includes them.

Originalparts list shows1910-05#14 quantity1; accessories show quantity3.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 40 · printed page 37Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 62 · printed page 59

Alternate systems special needles

Not yet verified
  • Not yet verified: Alternate systems/products, point/material variants, twin/special-needle and unrestricted clearance remain unverified beyond literal1910-05(135x9) and conditional table.

Bobbin

Case removal

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Close required covers before operation; do not infer loading-class or universal hook orientation.

With power off, open bed slide, raise latch and lift out the bobbin case as Figure11 shows.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 15 · printed page 12

Case threading

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; For straight stitching the source notes a better result if thread does not pass through guide3. Use the complete illustrated route; no universal rotation direction inferred.

Follow Figure14 rotation arrow; thread through notch and under spring, then through case thread guide; leave approximately4inches as Figures16–17 show.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 17 · printed page 14

Case replacement

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power off throughout replacement; do not run with bed slide open.

Hold case by latch, seat on holder spindle so position finger enters its notch, release latch and press firmly in place; close bed slide.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 18 · printed page 15

Winding scope

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power-isolate setup and adjustments; running winding is distinct. Amount/uneven-winding adjustments require complete figure and trained judgment; no80percent fill or unrelated direct-drive procedure transfer.

Source winding uses handwheel stop-motion screw, fully seated bobbin on spindle and Figure13 pre-tension/latch; do not guide or hold thread while winding.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 16 · printed page 13

Tension adjustment

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power-isolated adjustment for actual sewing conditions; needle-thread tension is a separate control.

Clockwise case tension screw rotation increases bobbin-thread tension; counterclockwise decreases it.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 22 · printed page 19

Class dimensions material substitution

Not yet verified
  • Not yet verified: Original606513/case606512 numbers do not establish class/system, dimensions/profile/material or interchangeable substitutes.

Presser foot

Pressure adjustment

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power-isolated trained-personnel adjustment; no universal force setting or substitute-foot fit established.

Loosen regulator nut; clockwise toward+ increases foot pressure and counterclockwise toward– decreases it; retighten nut.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 20 · printed page 17

Knee lift setup

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power-isolated trained setup; two-handed head handling/crushing warning. Lift/linkage dimensions do not prove shank, mount, adapter or cross-model item fit.

Knee-lift setup in Figure35 uses approximately9mm raised-foot position and a64mm linkage reference.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 28 · printed page 25

Original needle plate part

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Literal source-local quantity1 occurrence in exact model column; not retail fit, substitution, material or cross-model interchangeability. Figure29 prints605652(20U-102/102C/309), while partsTable6.3 has606652for109/109C/309/910. No silentpart/name correction or102alias accepted.

606402

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 40 · printed page 37

Source accessory inventory

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Source quantities only, not current possession or universal compatibility/incompatibility. Listed attachments do not establish standardized mount or substitute fit; guard281822zero for309/910 does not permit guard-free operation.

606691zipper/606692buttonhole/606693straight/606694hemmer feet;606695straight plate/606696embroideryplate/606697straightfeed:quantity1each.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 62 · printed page 59

Mount shank holder adapters item fit

Not yet verified
  • Not yet verified: Standardized mount/shank geometry, holder/adapter requirements and exact retail-item fit remain unverified; screw and original assembly numbers do not establish them.

Plate diagram name join

Not yet verified
  • Not yet verified: Figure29 literal20U-102/102C on605652plate is not accepted as109/109C alias or corrected model applicability. Exact source-local parts Table6.3 remains separately bound.

Specifications & documented facts

Specifications apply to the named model and document edition. Read any setup, fabric or safety requirements with the answer.

Performance & stitch capabilities

Care

Oil and hook lubrication

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power off for lubrication/access, trained maintenance, complete illustrated points. No unstated lubricant grade, dosing interval or material substitution.

Table1 specifies Singer Oil. Regularly apply one or two drops at the illustrated rotating-hook oil hole; oil felts/oiling points and a small amount of gear grease follow Figures8–9.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 13 · printed page 10

First or disuse run

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Separate power-isolated lubrication from running break-in; required guards and trained safe setup. Not a universal daily speed or service interval.

For first setup or extended disuse, oil and run at1,000–1,500spm for about10minutes as the source directs.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 5 · printed page 2Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 13 · printed page 10Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 32 · printed page 29

Cleaning

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power-isolate maintenance; no unsupported solvent compatibility.

Periodically clean machine head with a soft dry cloth; do not use lacquer thinner.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 32 · printed page 29

Safety inspection

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Electrical faults require qualified personnel; actual installed motor/belt configuration must be checked, not inferred.

Periodically check safety devices, fixing/support screws, V-belt condition/tension where fitted, motor overheating and cord/plug damage.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 5 · printed page 2Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 32 · printed page 29

Documents

Retained manual edition

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Actual printedSept2011 differs from registrytitleOctober; retain both provenance and discrepancy. OnecombinedPDF, not two originals or a separate service manual.

English Instruction Manual and Parts List,P/N364338-001Rev1September2011,64physicalpages.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 64 · printed page back cover

Additional independent oem roles

Not yet verified
  • Not yet verified: Four combined instruction-and-parts OEM PDFs are retained; no separate service manual, accessory compatibility guide, schematic or brochure accepted. No exhaustive search or distribution permission claimed.

Additional turkish oem edition

  • Exact model-table presence and literal edition only; fourcombinedPDFs total, not eight independent originals. No translatedtechnical, hardware, region, supersession or public distribution equivalence. Turkishprinted264338 andSpanishMarch2011/titleNovdiscrepancies preserved.

Additional retainedTurkish combinedinstruction-and-parts OEM original,Literal P/N264338-001 Rev1 2011-09,64pages.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 420U/20E combined instruction-and-parts original - TurkishPDF page 7 · printed page 420U/20E combined instruction-and-parts original - TurkishPDF page 64 · printed page back cover

Additional portuguese oem edition

  • Exact model-table presence and literal edition only; fourcombinedPDFs total, not eight independent originals. No translatedtechnical, hardware, region, supersession or public distribution equivalence. Turkishprinted264338 andSpanishMarch2011/titleNovdiscrepancies preserved.

Additional retainedPortuguese combinedinstruction-and-parts OEM original,P/N364338-003 Rev0 November2011,64pages.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 420U/20E combined instruction-and-parts original - PortuguesePDF page 7 · printed page 420U/20E combined instruction-and-parts original - PortuguesePDF page 64 · printed page back cover

Additional spanish oem edition

  • Exact model-table presence and literal edition only; fourcombinedPDFs total, not eight independent originals. No translatedtechnical, hardware, region, supersession or public distribution equivalence. Turkishprinted264338 andSpanishMarch2011/titleNovdiscrepancies preserved.

Additional retainedSpanish combinedinstruction-and-parts OEM original,P/N364338-001 Rev0 March2011,64pages.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 420U/20E combined instruction-and-parts original - SpanishPDF page 7 · printed page 420U/20E combined instruction-and-parts original - SpanishPDF page 64 · printed page back cover

Motor

Manual setup reference

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Manual family setup reference only, not actual supplied/present electrical configuration, voltage or universal motor fit. Conditional servo warning remains conditional.

Section2.3 lists1/3HP(250W),4-pole low-speed clutch motor and M-type V-belt.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 8 · printed page 5

Actual installed electrical configuration

Not yet verified
  • Not yet verified: Actual installed motor, voltage, electrical ratings and changes by region/revision remain unverified; manual setup reference does not identify the present machine motor.

Parts

Safety

Power isolation

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Switch off before unplugging; conditional quiet-servomotor warning does not prove a supplied motor type.

Turn off or unplug before threading, replacing bobbin/needle/foot/plate/feed components, maintenance and when not operating.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 5 · printed page 2

Trained operation and service

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Stop immediately for damaged electrical equipment. No motor wiring-box access or safety-device bypass.

Use trained operators, required safety devices, goggles, proper grounding, cable and connectors. Repairs, fitting and maintenance require trained personnel; electrical work requires qualified personnel.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 5 · printed page 2

Guards and head handling

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power isolate and use both hands for head handling; crushing risk between head and table. Accessory-list zero quantities do not remove these safety requirements.

Do not run without belt cover, finger guard or thread take-up guard; take care when lowering or lifting the sewing head.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 5 · printed page 2Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 14 · printed page 11Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 19 · printed page 16Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 28 · printed page 25

Troubleshooting

Needle thread breaks

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Possible causes, not diagnosis. Power-isolate corrections and use complete manual; unresolved problems go to service center.

Check threading, lint around guides/tension, tension, needle bend/point/insertion/size and thread quality.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 14 · printed page 11Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 19 · printed page 16Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 33 · printed page 30

Bobbin thread breaks

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Possible checks only; power off for handling/correction; no substitute bobbin recommendation.

Check bobbin threading, tangles, tension and correct winding/smooth rotation.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 17 · printed page 14Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 18 · printed page 15Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 22 · printed page 19Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 33 · printed page 30

Skipping and needle breaks

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Possible causes, not guaranteed repair. Do not pull fabric; stop/isolate for corrections, service unresolved faults.

Check needle insertion/condition and needle-thread-fabric match; loose needle screw or pulling fabric while sewing can contribute to breakage.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 14 · printed page 11Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 33 · printed page 30

Feeding and puckering

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Do not transfer manual stitch-length controls to20E-910, explicitly excluded in section3.13. Power-isolated corrections; no machine application expansion.

For feeding problems check applicable stitch-length and foot-pressure controls; for puckering check threading, needle point and tension.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 20 · printed page 17Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 33 · printed page 30

Noise and escalation

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power-isolate cleaning; no diagnosis or unrestricted electrical/timing repair instructions.

Heavy rotating noise may relate to lint at feed dog or hook; if sewing difficulty remains after appropriate adjustments contact service center.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 33 · printed page 30

Use

Threading

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Power off; finger and thread take-up guards must be present. Read complete illustrated routing.

Raise needle bar to its highest point, follow Figure19 threading order and leave approximately4cm at needle.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 19 · printed page 16

Needle thread tension

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Actual sewing conditions determine tension; power-isolated adjustment, distinct from bobbin tension.

Clockwise needle-thread tension nut increases tension; counterclockwise decreases it.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 21 · printed page 18

Manual stitch length and reverse

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Section3.13 explicitly excludes20E-910; adjust safely/power-isolated and use completeFigure20, no910manual-control transfer.

Align stitch-length dial millimeters to its marker; reverse lever down gives reverse feed and release gives forward feed, with separate reverse-length thumbscrew.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 20 · printed page 17

Manual width regulator

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Sections3.19–3.20 exclude20E-910; poweroff, needle out of fabric; this does not establish alternate plate/foot clearance.

Spring-biased width regulator and two thumbscrews control wide/narrow limits fromzero to model maximum.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 23 · printed page 20

Needle position controls

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Section3.18 excludes20U-309/20E-910; poweroff, needle out of fabric. No twin/special-needle fit inferred.

Left,center,right needle-position settings support straight/zigzag placement; center is normal sewing, left/right special placement.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 22 · printed page 19

Knee width control scope

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Explicitly excludes20U-309/20E-910. Power-isolated trained setup, two-handed head handling and crushing risk; distinct from64mm foot-lift linkage.

Figure36 describes knee-operated width control with67mm linkage reference and exact9/12mm model width.

Sources and pages
Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 7 · printed page 4Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 4 · printed page 1Zigzag Sewing Machine - Instruction Manual and Parts ListPDF page 29 · printed page 26

Part numbers & accessories

These are manufacturer part references. A drawing or matching number alone does not confirm that a replacement from a seller fits. Check the model-specific listing and restrictions.

Replacement compatibility has not been checked. The original source listings below retain their exact scope.

Original parts listed in the cited source

These are source-local original references. They do not establish a replacement, supersession, adapter or retail product fit.

Original bobbin part

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Literal exact-column original occurrence; no retail fit, substitution, material or hardware equivalence.

606513

Full answer and all conditions →

Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 7 · printed page 4 · Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 48 · printed page 45

Original bobbin case part

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Literal exact-column original occurrence; no retail fit, substitution, material or hardware equivalence.

606512

Full answer and all conditions →

Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 7 · printed page 4 · Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 48 · printed page 45

Original hook assembly part

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Literal exact-column original occurrence; no retail fit, substitution, material or hardware equivalence.

606514

Full answer and all conditions →

Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 7 · printed page 4 · Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 48 · printed page 45

Original assembly part

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Literal exact-column original occurrence; no retail fit, substitution, material or hardware equivalence.

606651

Full answer and all conditions →

Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 7 · printed page 4 · Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 40 · printed page 37

Original needle plate part

  • Exact 20U-112 column and retained EnglishSeptember2011 edition only; obey safety and model-specific procedure exceptions.; Literal source-local quantity1 occurrence in exact model column; not retail fit, substitution, material or cross-model interchangeability. Figure29 prints605652(20U-102/102C/309), while partsTable6.3 has606652for109/109C/309/910. No silentpart/name correction or102alias accepted.

606402

Full answer and all conditions →

Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 7 · printed page 4 · Zigzag Sewing Machine - Instruction Manual and Parts List · P/N364338-001 Rev1 September2011 · PDF page 40 · printed page 37

Check the exact model and part before ordering. Missing information does not mean a part is incompatible.

Care, setup & service references

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.

Power isolation ↗Trained operation and service ↗Guards and head handling ↗Needle insertion ↗Oil and hook lubrication ↗First or disuse run ↗Cleaning ↗Safety inspection ↗

Service-manual availability and service-only procedures remain unestablished unless separately cataloged and reviewed.

Coverage and source-review limits

Operating limits and original part numbers apply to the exact model column. Additional language editions are listed as documents, not used as translated technical evidence. Unanswered interfaces and replacement compatibility remain open.

Coverage and remaining questions

Operating manual
Listed below; check the edition and available link.
Exact OEM part application
No model-specific part application is listed here.

Still to confirm

An unanswered question does not mean a part is incompatible. We have not confirmed enough information to recommend it.

Needle — Alternate systems special needles: Not established Full recorded limit & conditions →

Bobbin — Class dimensions material substitution: Not established Full recorded limit & conditions →

Presser foot — Mount shank holder adapters item fit: Not established Full recorded limit & conditions →

Presser foot — Plate diagram name join: Not established Full recorded limit & conditions →

Motor — Actual installed electrical configuration: Not established Full recorded limit & conditions →

Documents — Additional independent oem roles: 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.

Next evidence targets

  • Establish standardized shank/mount and adapter compatibility independently of lift height or original assembly numbers.
  • Establish original bobbin class, geometry/material and replacement limits with exact applicable evidence.
  • Resolve conflicting original plate references where present; do not choose a substitute from the conflict.
  • Research other applicable OEM roles; translated editions establish presence rather than independent technical claims.

These are research questions, not claims that the missing relationship exists.

Sources and page references

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.

Document and page references (33)

Zigzag Sewing Machine - Instruction Manual and Parts List

Published by Singer · P/N364338-001 Rev1 September2011 · English

Retained English September2011 exact model columns and stated procedure exceptions only. Read complete illustrated safety and procedure; source-local original parts do not establish retail fit or substitutions.

Checked against the document text.

Document and available links →About this document →

20U/20E combined instruction-and-parts original - Turkish

Published by Singer · Literal P/N264338-001 Rev1 2011-09 · Turkish

Additional exact-model document presence and literal edition only; no translated technical, region, hardware or supersession equivalence.

Document and available links →About this document →

PDF page 7 · printed page 4

About this document link

Applicability and edition

Checked as a transcription of the page image.

PDF page 64 · printed page back cover

About this document link

Applicability and edition

Checked against the document text.

20U/20E combined instruction-and-parts original - Portuguese

Published by Singer · P/N364338-003 Rev0 November2011 · Portuguese

Additional exact-model document presence and literal edition only; no translated technical, region, hardware or supersession equivalence.

Checked against the document text.

Document and available links →About this document →

20U/20E combined instruction-and-parts original - Spanish

Published by Singer · P/N364338-001 Rev0 March2011 · Spanish

Additional exact-model document presence and literal edition only; no translated technical, region, hardware or supersession equivalence.

Checked against the document text.

Document and available links →About this document →

Editorial responsibility & corrections

Alex Shick · Founder and editor. Corrections managed by Alex Shick.

This Singer 20U-112 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

About this information

Answers come from the documents named on this page. They describe those editions, and may not cover later changes to the machine or manual.

What the original source review covered

Source review: These entries reuse the retained exact-model source acceptance. The original independent review sampled 48 of 288 positive claims across six profiles; it did not independently verify every claim. English supports technical answers; the other editions establish document presence only, with their original native or visual evidence methods. The separately labelled matching English download does not establish equality of other editions.