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Singer 4421, 4423 sewing machine service manual

Includes the following models

  • Singer 4421 Heavy Duty Sewing Machine
  • Singer 4423 Heavy Duty Sewing Machine
  • Serial Numbers:
    • Singer 4421: Serial numbers beginning with Y814
    • Singer 4423: Serial numbers beginning with Y813
  1. Names of principal parts
  2. Removing methods of external parts
    • 2-1 Sewing table
    • 2-2 Face plate
    • 2-3 Base cover
    • 2-4 Free arm bas
    • 2-5 Free arm slab
    • 2-6 Arm top cover
    • 2-7 Back cover
    • 2-8 Front cover
  3. Adjusting methods of each part
    • 3-1 Play of arm shaft
    • 3-2 Noisy - take up lever adjustment
    • 3-3 Needle drop position adjustment
    • 3-4 Height of presser foot
    • 3-5 Needle flow at maximum zigzag width
    • 3-6 Needle center position adjustment
    • 3-7 Needle position on zigzag
    • 3-8 Automatic needle threader adjustment
    • 3-9 Adjustment of feed rock shaft and feed lifting rock cam
    • 3-10 Height of needle bar
    • 3-11 Timing of needle and hook
    • 3-12 Distance-needle-hook
    • 3-13 Play between shuttle driver shaft gear and lower shaft gear
    • 3-14 Play of shuttle driver shaft
    • 3-15 Feed-dog height
    • 3-16 Position of feed-dog in relation to the needle plate (left to right)
    • 3-17 Upper thread tension adjustment
    • 3-18 Shuttle hook tension adjustment
    • 3-19 Motor belt tension
    • 3-20 Drop point of needle
    • 3-21 Forward and reverse stitching in buttonhole sewing (feeding pitch of reverse and forward stitching is not even)
    • 3-22 Buttonhole upper and lower stitching problem
    • 3-23 Bobbin winding problem

File specifications

File size: 8.69 MB
File type: PDF
Language: English

Printable: Yes
Estimated download time: 0.18 Minutes
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Product Information

Table of Contents

  1. Introduction
  2. Specifications
  3. Adjustments
  4. Lubrication
  5. Maintenance
  6. Electrical
  7. Parts List

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This manual is incredibly useful to mechanics, technicians, and owners as it provides detailed information on the Singer 4421, 4423 sewing machine, including specifications, adjustments, lubrication, maintenance, electrical information, and a parts list.

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doug millersays...
I paid for singer 4423 service manual with paypal. it did not down load.