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This manual is professionally bound,

just like the original Singer manual.

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Unlike the original 60 year old manual that has become frail, brittle, mildewed, stained and yellowed after so many years, this manual looks like an original Singer manual that has been preserved in NEW CONDITION!

Just like the Singer company printed their manual on their in-house printing press, we printed this manual on our in-house printing press. This manual may also serve you for the next 60 years.

In fact, if we didn't tell you,

you could not tell the difference

between this manual and the

original manual!

This 42-page full-size Service Manual is complete and very clean with no "black dots," smudges, stains, or any other imperfections. No pages are missing, dirty, or damaged.

The manual includes descriptions and illustrations which will show you how to do the following:

• Identify the Principal Parts of Machine 401

• Description of Class 401 Machines

• Preparation of Machine for Inspection

• Lubricate Class 401 Machines (professional service lub)

• Set Presser Foot at Correct Height

• Set Feed Dog at Correct Height

• Set Feed Dog Lengthwise in Throat Plate Slots

• Set Feed Dog Sidewise in Throat Plate Slots

• Eliminate Noise in Feed Movement

• Adjust Thread Clearance

• Feed Timing

• Set the Check Spring

• Adjust Needle Thread Tension

• Set Needle Bar at Correct Height

• Check Position of Needle in Relation to Straight-Stitching Throat Plate

• Eliminate Side-Shake or Binding of Needle Bar

• Check These Points When Stitch Regulator Sticks, Creeps or Binds

• Eliminate End Play or Binding of Feed Rock Shaft and Feed Lifting Rock Shaft

• Eliminate End Play or Binding of Hook Driving Shaft

• Eliminate End Play or Binding of Upright Arm Shaft

• Eliminate End Play or Binding of Horizontal Arm Shaft

• Set the Index Pins at the Correct Height

• Time the Cam Stack

• Set Cam Selector Arm Stops

• Zero-Out the Machine

• Centralize the Needle Bar Driving Arm with Disk Selector Arm Bracket Followers

• Centralize the Needle in Needle Hole in Straight-Stitch Throat Plate

• Time the Rotating Hook

• Set the Position of the Hook Point to or From the Needle

• Removal and Replacement of the Upright Arm Shaft

• The Motor

• Removal and Replacement of the Light Fixture

• Removal and Replacement of the Wiring Harness

• Removal and Replacement of the Needle Thread Tension

• Removal and Replacement of the Hand Wheel and the Counterbalance

• Removal and Replacement of the Bobbin Winder

• Stitch Regulator

• Removal and Replacement of the Throat Plate Position Bracket

• Removal and Replacement of the Feed Lifting Rock Shaft

• Feed Rock Shaft Assembly

• Hook Driving Shaft

• Removal and Replacement of the Hook Driving Shaft

• Rotating Hook and Position Finger

• Removal and Replacement of the Feed Lifting Rock Shaft Connecting Rod

• Feed Forked Connection

• Removal and Replacement of the Needle Bar

• Needle Bar Vibrating Bracket

• Needle Thread Take-Up

• Removal and Replacement of the Cam Stack

• Cam Selector Arm Shaft and Followers

• Removal and Replacement of the Needle Bar Driving Arm

• Bight Amplitude and Pattern Selector

• Removal and Replacement of the Horizontal Arm Shaft

• Hints for Adjusters and Mechanics

• Run-In the Machine

• Wiring Diagram for Machines of Class 401

• Appendix 1: Set the Feed Dog at the Correct Height

• Appendix 2: Test for Squareness of Presser Foot to Feed

Here are photos of some of the pages from the manual. You can see the superb quality of the print, photos, diagrams, and the quality of the paper itself.

Professional machine lubrication. (photo 05)

 Removal and replacement of horizontal arm shaft. (photo 06)

Removal and replacement of thread tension mechanism. (photo 07)

Removal and replacement of: cam stack, needle bar driving arm. (photo 08)

Wiring diagram of class 401 machines. (photo 09)

Set index pins; Time cam stack. (photo 10)

Removal and replacement of light fixture, wiring harness. (photo 11)

Zero out the machine. (photo 12)

These service instructions are very detailed and utilize diagrams and illustrations to make it easy to understand and carry out the instructions. In most cases a simple tool, like a screwdriver, is needed to do the task. And, once you know what to do, you may be able to perform the timing or the adjustment in just a couple of minutes! And when needed, you may be able to expertly remove and replace every single part of the machine!

These Service Instructions are a

MUST

for every owner

of a Singer 401, 401A Machine!

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Note for users of “Singer Service Manual for Classes 401, 403 and 404” :

Most people who use this manual also use an additional manual which includes service information that is directly applicable to machines of Classes 401, 403 and 404.

This additional manual is:

     “Illustrated List of Parts for Classes 401, 403 and 404”

      (available at our eBay listing # 201412136185)

The additional “Illustrated List of Parts Manual” includes illustrations of every single component, screw, nut, spring, plate, rod, hinge, handle, arm, etc. Every internal part of the motor is shown. Every internal part of the speed control pedal is shown. All the components and parts of every single accessory are shown. All these parts and components are illustrated in the proper size with respect to their actual size and with respect to each other.

This “Illustrated List of Parts for Classes 401, 403 and 404” manual is available at our eBay listing # 201412136185.

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