Singer 451k145 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 451k145 Specifications

General

Model	451k145
Built-in Needle Threader	No
Drop Feed	Yes
Operation	Mechanical
Needle Positions	Center

Summary

Service Manual and Parts List

Machine Description and Features

Safety Cautions and Speed Recommendations

Provides critical safety warnings and guidance on recommended operating speeds for optimal performance.

Lubrication and Cleaning: Reservoir and Daily Care

Lubrication and Cleaning: Post-Installation, Bobbin Winder, Hook Test

Hook Lubrication Test and Adjustment

Procedure to test and adjust the oil flow to the sewing hook for correct lubrication.

Needles and Setting the Needle

Setting the Needle Correctly

Bobbin Winder Installation, Winding, and Threading

Winding and Threading the Bobbin Case

Sewing Preparation and Thread Tension

General and Specific Thread Tension

Instructions for setting and regulating both needle and bobbin thread tensions for optimal stitching.

Presser Foot, Stitch Length, and Reverse Feed

Regulating Presser Foot Pressure

Regulating Stitch Length

Instructions on how to adjust the stitch length setting on the machine.

Basic Sewing Operations and Troubleshooting

Broken Thread and Breakage Avoidance

15 Hints for Carefree Operation

Essential tips and advice for ensuring smooth, trouble-free operation of the sewing machine.

Machine Specifications and Preliminary Checks

Preliminary Inspection Checklist

Timing the Machine: Rotary Take-up and Arm Shaft

Timing the Machine: Needle Bar Height

Setting Needle Bar Height

Instructions for setting the needle bar to the correct height relative to the hook.

Timing the Machine: Needle Bar Bushing, Hook, Clearances

Needle Bar Bushing and Hook Timing

Adjusting the needle bar bushing and timing the sewing hook for correct loop formation.

Needle-to-Hook and Finger Clearances

Timing the Machine: Needle Guard and Check-Spring

Needle Guard Function and Stringing

Explanation of the needle guard's role and how to adjust it for proper needle deflection.

Setting the Check-Spring

Instructions for setting the check-spring for proper thread control during stitching.

Tension Releaser and Presser Bar Height Adjustments

Tension Releaser Adjustment

Presser Bar Height Setting

Procedure for setting the presser bar to the correct height for optimal fabric feeding.

Feed Mechanism Timing and Centralization

Timing the Feed Mechanism

Instructions for setting the feed mechanism timing for correct stitch formation.

Centralizing Feed Dog in Slots

How to adjust the feed dog to ensure it moves centrally within the throat plate slots.

Feed Adjustments: Eccentric Gib, Height, Stop Pin

Setting Feed Dog Height

Adjusting the height of the feed dog to ensure proper fabric feeding.

Bobbin Case Holder and Sewing Hook Removal/Replacement

Sewing Hook Procedures

Arm Shaft Removal and Replacement