How to Tighten or Replace a Serger Drive Belt
Over the years, overlocker drive belt requires inspection, at least. When you remove the protective cover, you can find out what you need to tighten the drive belt. Sometimes it is required and replacing it.
These photos and comments help you to tighten or replace a broken drive belt in an overlock sewing machine.
You must first disconnect the pedal plug.
Using a screwdriver remove the screws holding the cover.
Note: Other overlock models may have a different access to the belt. This post was made on an example of Juki Baby Lock serger (BL3 - 407) without overlocker differential feed and having three threads.
First, you need to check the belt tension. Press your index finger in the middle portion of the belt, as shown.
The serger drive belt should fall for about 1 cm, with an average effort pressing on the belt.
There are two ways how to tighten or replace a serger drive belt. You can loosen this powerful screw. To weaken it is requires a powerful flat-blade screwdriver.
You need to unscrew these nuts and move the electric motor.
In any case, you will need a wrench or a powerful flathead screwdriver.
Do not use excessive force when tightening these nuts.
Overlocker drive belt may have a circular cross section or with lugs on both sides, as shown. Use the second type - lug belt.
If you need to replace the belt you have to measure the diameter of a torn belt. Diameter of a new serger drive belt should have the same value.
On this photo is shown another model serger. To tighten or replace overlocker drive belt is necessary to remove the side cover overlock body.
English isn't my first language, so please excuse any mistakes and help correct them.
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