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General| Stitch Type | Lockstitch |
|---|---|
| Needle Quantity | 1 |
| Differential Feed Ratio | Not applicable |
| Lubrication | Automatic |
| Presser Foot Lift | 15 mm |
| Stitch Width | Not applicable |
| Needle Size | #14-#23 |
| Thread Tension | Adjustable |
Defines DANGER, WARNING, and CAUTION levels for machine operation safety.
Details warning symbols and labels for safe machine operation.
Covers basic precautions, safety devices, application, training, and power-off procedures.
Safety measures for transportation, unpacking, installation, and operation stages.
Safety procedures for lubrication, maintenance, and operating environment.
Additional safety tips for using the DU-141H-4 and DU-141H-7 machines.
Details technical specifications like stitch system, application, speed, and noise level.
Steps for attaching hinge washers and rubber cushions during machine installation.
Procedure for adjusting belt tension for safe operation.
Steps for assembling and fixing the thread stand to the machine table.
Procedure for attaching the belt cover support and the belt cover.
Points to lubricate before starting sewing machine operation.
Steps for refilling the oil reservoir and adjusting oil supply to the hook.
Procedure for inserting and securely tightening the needle in the needle bar.
Steps for routing thread and winding the bobbin.
Instructions for removing and properly threading the bobbin case.
Procedure for inserting the take-up thread guide rod into the designated hole.
Step-by-step guide for threading the machine head.
How to adjust stitch length using the dial.
Instructions on how to engage and disengage reverse feed stitching.
Procedures for adjusting needle and bobbin thread tension for proper stitch formation.
How to adjust the stroke and tension of the thread take-up spring.
How to adjust pressures for presser foot and walking foot based on material type.
Procedure for adjusting the feed dog height for optimal feeding.
How to adjust the longitudinal position of the walking foot.
How to adjust the alternate vertical strokes of the walking and presser feet.
Steps for positioning the needle bar and hook for correct timing.
How to adjust the clearance between the needle and hook point.
How to adjust the auxiliary thread tension using the control nut.
How to adjust the pressure of the fixed knife for thread trimming.
How to position the reverse feed solenoid for proper function.
How to align the rotary knife to its standard home position.
How to adjust the thread trimming cam for correct timing.
Step-by-step guide for manually operating the thread trimmer.
Procedures for replacing the rotary and fixed knives.
Relationship between sewing speed and alternate lift settings.
Diagnoses and fixes for thread breakage issues.
Diagnoses and fixes for stitch skipping issues.
Troubleshooting for loose stitches and occasional skipped stitches.
Corrections for thread slipping off the needle and trimming problems.
Troubleshooting for complete thread trimming failure and motor stop issues.
