Singer 451k41 User Manual

Form K6S06
(562)
SERVICE MANUAL
PARTS LIST
SINGER
451k41, 451k45 and 451k145
HIGH SPEED
SINGLE NEEDLE
LOCK STITCH
MACHINES
Machine 451K41
THE SINGER MANUFACTURING COMPANY
Copyright Under International Copyright Union
*A Trademork of THE SINGER MANUFACTURING COMPANY
Printed in Great Britain
From the library of: Superior Sewing Machine & Supply LLC

Singer 451k41 Specifications

General

Brand	Singer
Model	451k41
Category	Sewing Machine
Language	English

Summary

Machine Description and Cautions

CAUTION

Important safety warning regarding initial machine oiling before operation.

Setting Up and Initial Lubrication

LUBRICATION AND CLEANING

Instructions for daily oiling and keeping the machine clean.

Hook Lubrication Procedures

HOOK LUBRICATION TEST AND ADJUSTMENT

Testing and adjusting oil flow to the rotary sewing hook for proper lubrication.

Needle Information and Setting

TO SET THE NEEDLE

Procedure for correctly inserting and tightening a new needle in the needle bar.

Thread Handling

UPPER THREADING

Step-by-step guide for threading the needle and upper thread path.

Sewing Preparation and Tension Settings

THREAD TENSION

Explanation of balanced needle and bobbin thread tension for proper stitching.

NEEDLE THREAD TENSION SETTING

How to set needle thread tension for general sewing purposes.

Presser Foot and Stitch Adjustments

TO REGULATE PRESSURE OF PRESSER FOOT ON MATERIAL

Adjusting presser foot pressure for efficient material feeding.

TO REGULATE THE LENGTH OF STITCH

How to change the stitch length using the designated button.

TO REVERSE THE FEED

Operational Guidance and Troubleshooting

15 HINTS FOR CAREFREE OPERATION

Essential maintenance and operational tips for smooth running.

Specifications and Preliminary Checks

PRELIMINARY INSPECTION

Essential checks to perform before making major adjustments or installations.

To Time the Machine

2. SETTING NEEDLE BAR AT CORRECT HEIGHT

Adjusting the needle bar height using timing marks.

3. TO SET NEEDLE BAR AT CORRECT HEIGHT WITHOUT USE OF TIMING MARK

Setting needle bar height when timing marks are unavailable.

4. TO RESET NEEDLE BAR BUSHING

Resetting the needle bar bushing for proper alignment.

5. TO TIME SEWING HOOK

Aligning the sewing hook with the needle and timing marks.

6. CLEARANCE BETWEEN NEEDLE AND POINT OF HOOK

Ensuring proper clearance between the needle and hook point.

7. TO SET CLEARANCE FOR BOBBIN CASE HOLDER POSITION FINGER

8. FUNCTION OF BOBBIN CASE HOLDER NEEDLE GUARD

Role of the needle guard in preventing needle-hook contact.

10. TO SET CHECK-SPRING

Adjusting the check-spring for proper thread tension control.

Needle Thread Tension and Presser Bar Adjustments

TO ADJUST THE NEEDLE THREAD TENSION RELEASER

TO SET PRESSER BAR AT THE CORRECT HEIGHT

Setting the correct height for the presser bar.

Feed Mechanism Timing and Adjustment

TO TIME THE FEED

Setting the feed movement timing for correct stitch formation.

IF FOR ANY REASON IT MAY BE NECESSARY TO ALTER TIMING OF FEED

TO CENTRALIZE FEED DOG IN THROAT PLATE SLOTS

Adjusting the feed dog's position within the throat plate slots.

Specific Feed Mechanism Adjustments

TO ADJUST FEED DRIVING ECCENTRIC GIB

TO ADJUST FEED LIFTING ECCENTRIC CAM

TO SET FEED DOG AT CORRECT HEIGHT

TO ADJUST FEED DRIVING AND REVERSING MECHANISM

Bobbin Case Holder and Sewing Hook Procedures

REMOVAL OF THE SEWING HOOK

REPLACEMENT OF THE SEWING HOOK

Hook Shaft and Feed Rock Shafts

REMOVAL OF THE HOOK SHAFT

REPLACEMENT OF THE HOOK SHAFT

Hook Driving Shaft and Arm Shaft Belt

REMOVAL OF THE HOOK DRIVING SHAFT

REPLACEMENT OF THE HOOK DRIVING SHAFT

Arm Shaft Assembly and Replacement

REMOVAL OF THE ARM SHAFT

REPLACEMENT OF THE ARM SHAFT