Several years ago I took on a young apprentice in my professional workroom. To help her learn safely and transition from using a slow domestic machine to one of my much faster B755 Mk III Brother industrial sewing machines I changed the pulley wheel from the original 10cm (4") diameter to a 7cm (2.75") diameter. I've been meaning to change it back ever since so this video shows me changing the pulley wheel back to the original 10cm one.

Pulley wheel sizes range from 45mm (1.75") to 120mm (4.75") and the smaller the pulley, the slower the machine will run. Other, more basic methods of slowing down industrial machines have involved placing blocks of wood or foam or even empty thread cones under the foot peddle to effectively stop the machine from reaching its full speed and indeed I have employed these somewhat ad hoc techniques myself in the past but in a professional workroom, at least here in the UK, that is not an acceptable method for employers with regard to health & safety and insurance compliance!

Whilst I was working on the machine I decided to also give it a really good clean from top to bottom including removing the head casing as well as the needle plate and feed dog to access the most used moving parts to give them a good check over and thorough clean.

I also performed a complete oil change, cleaning the sump tray in the process. A small but important element of the service that I forgot to include in the video however, is oiling the rotary hook. Please see pinned comment below for instructions with an image.

The oil I use for my machines is a standard lubricating oil from Eastman called P131, link below. It's pretty inexpensive and other brands are available, just check its suitability for industrial sewing machines.
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To skip to a particular section please refer to the timestamps below.

🕑 TIMESTAMPS 🕑

00:32 - Introduction to pulley wheel change
01:02 - Releasing the pulley belt
01:24 - Loosening the pulley nut and removing the pulley
04:23 - Fitting the new pulley wheel and tightening the pulley nut
05:56 - Refitting and tensioning the pulley belt
09:04 - Cleaning the top of the machine
10:02 - Removing the machine head casing and cleaning inside
12:37 - Replacing the machine head casing
13:39 - Removing the needle plate and feed and cleaning the spool area
18:22 - Lifting the machine head and cleaning under the spool area
22:21 - Cleaning the oil sump tray
26:11 - Inspecting the oil reservoir and removing the magnet
28:33 - Removing the sump screw to drain the oil
32:35 - Replacing sump screw, cleaning oil sump tray and replacing magnet
35:40 - Adding new oil
36:45 - Resetting machine head and refitting needle plate, feed and spool
39:40 - Cleaning thread guides and tensioners
40:56 - Inspecting and oiling inside machine head caps
42.26 - Re-threading
43:03 - Test sew

#HowToOilASewingMachine #HowToChangeAPulleyWheel #HowToServiceASewingMachine #IndustrialMachineService #BrotherIndustrial

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