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8. CLEANING
Turn off the power switch before carrying out cleaning. The motor will keep turning even after the power is switched
off as a result of the motor's inertia. Wait until the motor stops fully before starting work.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they do not get
into your eyes or onto your skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause vomiting and
diarrhea.
Keep the oil out of the reach of children.
Use both hands to hold the machine head when tilting it back or returning it to its original position. If only one hand
is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.
8- 1. Daily cleaning procedures
The following cleaning operations should be carried out each day in order to maintain the performance of this machine and to
ensure a long service life.
Furthermore, if the sewing machine has not been used for a long period of time, carry out the following cleaning procedures
before using it again.
CAUTION
<Cleaning>
1. Turn the machine pulley to move the needle to the needle
up stop position.
2. Open the slide plates at the left and right.
3. Remove the bobbin.
4. Clean the thread scraps from the rotary hook.
5. Install the bobbin (and the bobbin case).
2930M
<Filling the oil tank>
Use only the lubricating oil (Nisseki Mitsubishi Sewing Lube
10N; VG10) specified by Brother.
* If this type of lubricating oil is difficult to obtain, the recommended
oil to use is <Exxon Mobil Essotex SM10; VG10>.
1. If the lubricating oil level drops below the bottom
reference line (2) of the oil gauge window (1), be sure to
add more oil. (Refer to p.11.)
2991M
<Checking>
1. Replace the needle if it is bent or if the tip is broken.
2. Check that the upper threads have been threaded
correctly. (Refer to page 19.)
3. Carry out a test sewing.
2992M
T-8420B, 8450B, 8720B, 8750B
8. CLEANING
28
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