Sewing Machine Motor Repair and Care

Fixing the Sewing Machine Motor

Here you will find a few tips for how to fix and clean the electric motor of your household sewing machine.

Fixing the Sewing Machine Motor, view 1

I hope you'll be able to disassemble and to repair such electric motor with your own hands correct, as shown here. But please be aware that disassemble any electrical appliances should specialists only. Therefore, this article can be considered for ordinary readers as information only.

Fixing the Sewing Machine Motor, view 2

To demonstrate the motor device, I used two different samples. These both motors are marked "Made in Japan" and they can fit many models of sewing machines. But there may be differences. In the first place the mounting method to the housing of the machine.
Note: The Industrial sewing machines have another type of electric motor.

Fixing the Sewing Machine Motor, view 3

In the second place the pulley to the motor shaft may have a different method of attachment.
All this must be taken into account in the case of motor replacement.

Fixing the Sewing Machine Motor, view 4

If you will remove this cap, using a screwdriver, you can see the motor brush. This detail is often out of order and can be easily replaced with your own hands.

Fixing the Sewing Machine Motor, view 5

Every electric sewing motor (that is installed in household sewing machine) has two brushes.

Fixing the Sewing Machine Motor, view 6

They're not brushes in the conventional sense; they're little sticks of carbon.
Note: If the graphite rod is too small the brush should be changed to the new.

Fixing the Sewing Machine Motor, view 7

Now let's take a look inside the electric motor of your sewing machine and learn how it works.
To do it you need remove these screw-nuts.

Fixing the Sewing Machine Motor, view 8

Then you can gently pull the half shell, as shown.

Fixing the Sewing Machine Motor, view 9

Look inside the shell. On the bottom is installed the sleeve which must be greased with two or three drops of oil.

Fixing the Sewing Machine Motor, view 10

Note: During removing any details you need pay attention to the sequence and number of washers.

Fixing the Sewing Machine Motor, view 11

Now you can gently pull out the rotor of electric motor and inspect it.

Fixing the Sewing Machine Motor, view 12

All coils of copper wire should have a lighter shade without fused and darkened areas.
Surface of motor armature need be clean and smooth.

Fixing the Sewing Machine Motor, view 13

All coils of copper wire a stator should have a lighter shade without fused and darkened areas also.

Fixing the Sewing Machine Motor, view 14

Don't forget to add two drops of oil to second sleeve of the motor that is installed on back part of shell.

Fixing the Sewing Machine Motor, view 15

You can clean the surface of motor armature with piece of paper or using pencil eraser. This surface must be free from dirty or scratched areas.

Fixing the Sewing Machine Motor, view 16

The surfaces of all metal contacts should not be oxidized, or rusted.

Fixing the Sewing Machine Motor, view 18

Inspect all electrical connections and the motor wiring.

Fixing the Sewing Machine Motor, view 18

All connections must be tightened well and the wires be intact.

English isn't my first language, so please excuse any mistakes and help correct them.
E-mail for sending is on the contact page.

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