This is the electronic PDF download version of the Singer 4421 4423 sewing machine service manual.
How to fix your sewing machine with the help of this Singer Corporation service manual.
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Specs and Product-Details:
Manual size: 8 MB
Production/model years: --
Type: service manual
Model specifications: 4421, 4423 / Singer Corporation
Manual Language: English
Manual format: PDF / e-book
Delivery: Download link will appear on the checkout page after your payment is complete.
Perfect for the DIY person!
This version is the same manual used by Singer service technicians for service, maintenance and repairs.
This Singer PDF / manual will pay for itself with one repair!
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
3-13 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
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Effective for Maintenance & Repair
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