Singer 4421 4423 sewing machine Repair manual 1. Names of principal component.2 2. Removing methods of external component 2-1 Sewing table3 2-2 Face plate.3 2-3 Base cover.3 2-4 Free arm base.3 2-5 Free arm slab4 2-6 Arm top cover.4 2-7 Back cover.5 2-8 Front cover6 3. Adjusting methods of each part 3-1 Play of arm shaft7 3-2 Noisy - take up lever adjustment8 3-3 Needle drop position adjustment.8 3-4 Height of presser foot9 3-5 Needle flow at maximum zigzag width.10 3-6 Needle center position adjustment11 3-7 Needle position on zigzag.12 3-8 Automatic needle threader adjustment.13 3-9 Adjustment of feed rock shaft also feed lifting rock cam.14 3-10 Height of needle bar.15/16 3-11 Timing of needle also hook17/18 3-12 Distance-needle-hook.19 3-13 Play between shuttle driver shaft gear also lower shaft gear20 3-14 Play of shuttle driver shaft21 3-15 Feed-dog height.22 3-16 Position of feed-dog in relation to the needle plate (left to right).23 3-17 Upper thread tension adjustment24 3-18 Shuttle hook tension adjustment.25 3-19 Motor belt tension26 3-20 Drop point of needle27 3-21 Forward also reverse stitching in buttonhole sewing (feeding pitch of reverse also forward stitching is not even)28 3-22 Buttonhole upper also lower stitching problem29 3-23 Bobbin winding problem.30 Thanks for using our manual download service. Despite compression the files can be very large. Please check you have enough storage space (can be up to 1 Gig) and you have a solid Internet connection. Sizes are mentioned on the page. Singer 4421 4423 sewing machine service manual 1. Names of principal parts.2 2. Removing methods of external parts 2-1 Sewing table3 2-2 Face plate.3 2-3 Base cover.3 2-4 Free arm base.3 2-5 Free arm slab4 2-6 Arm top cover.4 2-7 Back cover.5 2-8 Front cover6 3. Adjusting methods of each part 3-1 Play of arm shaft7 3-2 Noisy - take up lever adjustment8 3-3 Needle drop position adjustment.8 3-4 Height of presser foot9 3-5 Needle flow at maximum zigzag width.10 3-6 Needle center position adjustment11 3-7 Needle position on zigzag.12 3-8 Automatic needle threader adjustment.13 3-9 Adjustment of feed rock shaft and feed lifting rock cam.14 3-10 Height of needle bar.15/16 3-11 Timing of needle and hook17/18 3-12 Distance-needle-hook.19 3-13 Play between shuttle driver shaft gear and lower shaft gear20 3-14 Play of shuttle driver shaft21 3-15 Feed-dog height.22 3-16 Position of feed-dog in relation to the needle plate (left to right).23 3-17 Upper thread tension adjustment24 3-18 Shuttle hook tension adjustment.25 3-19 Motor belt tension26 3-20 Drop point of needle27 3-21 Forward and reverse stitching in buttonhole sewing (feeding pitch of reverse and forward stitching is not even)28 3-22 Buttonhole upper and lower stitching problem29 3-23 Bobbin winding problem.30 P.S. Manuals - your DIY specialist for repair manuals, workshop manuals and owner manuals. We have over 15.000 best quality manuals on stock for instant download. For example: Car manuals, bike manuals, lawn tractor manuals, forklift manuals, printer and copier manuals, snowmobile manuals, engine repair manuals, and more. If there are problems with the download, please contact us. Free support. Singer 4421 4423 sewing machine Repair manual