2007 Pfaff Hobbylock 4842 Overlock Sewing Machine Instruction Manual (P/N 29-629-000-39/000C)

This manufacturer-issued instruction manual covers the 2007 Pfaff Hobbylock 4842 overlock sewing machine, publication/form number 29-629-000-39/000C. It explains machine setup, threading, stitch selection, operating adjustments, user maintenance, and the optional accessories listed for this model.

• Threading system: Color-coded paths for the upper and lower loopers and both needles, plus the looper threading aid, needle threader, and spool-handling accessories.

• Stitch programs: Programs 01-14 for two-, three-, and four-thread flatlock, rolled-hem, serging, overedge, and assembly seams, with needle and converter requirements.

• Fabric control: Seam-width, stitch-length, presser-foot-pressure, thread-tension, and differential-feed guidance for lightweight fabrics, woven materials, knitwear, and gathering.

• Stitch correction: Top-side and underside formation views show which needle or looper thread needs correction for each covered seam program.

• User maintenance: Cleaning and lubrication points, needle-plate removal, upper-blade replacement, sewing-lamp replacement, and a symptom/cause/solution troubleshooting chart.

• Optional accessories: Setup and use for beading, taping, gathering/shirring, blindstitch, piping/welting, edge-guide, and curved-seam attachments.

This manual is suited to Hobbylock 4842 owners who can follow illustrated setup and user-maintenance procedures; it is not an internal service-center repair manual.

Threading, Programs, and Seam Setup

The threading section separates the upper looper, lower looper, and needle paths by color and shows the required order through the guides and tension discs. It also explains use of the converter for every two-thread seam and the two-needle, three-thread assembly seam. A key threading pitfall is covered directly: running the needle threads under the looper threads can cause thread breakage or skipped stitches.

The program overview connects each seam type with its needle position, stitch-length and width settings, stitch-width-latch position, and recommended color-coded tensions. These charts make it easier to select the correct setup before adjusting tension to compensate for fabric and thread differences.

Feed Control and Stitch Diagnosis

The differential-feed section explains how the front and rear feed dogs interact, then relates the settings to puckering, stretching, gathering, and wave effects on lightweight fabrics and knits. Used with the troubleshooting chart, it helps distinguish feed-related seam distortion from tension or threading faults.

Stitch-formation correction drawings cover four-thread overedge, narrow and wide three-thread overedge and flatlock, two-thread flatlock, rolled hems, and the two-needle assembly seam. Each view identifies the affected color-coded thread from the top and underside of the fabric. The safety section also warns that an incorrect needle plate can break the needle.

Maintenance and Accessory Applications

User maintenance includes brushing waste thread from the upper and lower blades, differential-feed area, and loopers; oiling the specified looper-area points; cleaning the rubber feet; replacing the movable upper blade; and changing the sewing lamp. The troubleshooting table addresses needle and thread breakage, skipped stitches, faulty stitch formation, irregular feeding, puckered seams, poor trimming, and a machine that will not run with the looper cover open.

The optional-accessory section goes beyond a parts list. It gives machine settings and illustrated use for the beading foot and bead plate, multi-purpose taping foot with elastic inserts, gathering/shirring foot and tongue, blindstitch foot, piping and welting foot and attachment, edge guide, and curved-seam guide. Order numbers are included for the listed accessories.

Selected Feed and Blade Adjustment Preview

The following values are a small sample of the operating and maintenance data in this instruction manual. Differential feed is adjustable from 0.5 to 2.0, with 1.0 as the synchronized standard setting; the manual relates the range to stretching light fabrics, normal feeding, and gathering or stabilizing knitwear (PDF pp. 30-31).

For upper-blade replacement, the front edge of the upper blade must sit 0.5-1.0 mm below the lower blade's cutting edge when the upper blade is at its lowest position (PDF p. 49). The illustrated relationship provides the check needed before the blade fastener is fully tightened.

Text Search, Navigation, and File Contents

Search and navigation: Printing is supported. Embedded text search is limited to a few front and rear pages; most instructional pages do not contain a searchable text layer. The PDF has no embedded bookmarks. The photographed procedures, program charts, and small labels remain readable when zoomed.

Delivered as one 6.82 MB printable PDF with 68 pages. The total includes the front cover, machine-parts overview, safety and contents pages, operating sections, rear parts-identification pages, and publication/imprint material; no separate addendum is included.