Brother International CB3-B917 Service Manual - Page 21

Assembly And Adjustment

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3. ASSEMBLY AND ADJUSTMENT 3. ASSEMBLY AND ADJUSTMENT CAUTION Assembly and adjustment of the sewing machine should only be carried out by a qualified technician. Turn off the power switch at the following times, otherwise the machine may operate if the pedal is depressed by mistake, which could result in injury. * 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. • When carrying out inspection, adjustment and maintenance • When replacing consumable parts such as the loopers and knife. If the power switch needs to be left on when carrying out some adjustment, be extremely careful to observe all safety precautions. 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 diarrhoea. Keep the oil out of the reach of children. Use only the proper replacement parts as specified by Brother. If any safety devices have been removed, be absolutely sure to re-install them to their original positions and check that they operate correctly before using the machine. Any problems in machine operation which result from unauthorized modifications to the machine will not be covered by the warranty. 3-1. Needle bar Apply grease 1. The screw flat of the drive shaft lever should face up and be inserted through the needle bar drive lever and set collar . 2. Line up the end of the drive shaft lever with the frame and secure with the screw 301s Apply grease 3. Press the set collar gently to the needle bar drive lever and tighten the screw. *Make sure there is a washer put on part A of the needle bar drive lever . Push lightly A 302s Mark 4. Line up the mark at the upper part of the crank rod and attach. *While turning the stop cam (pulley), tighten the screw little by little so that torque will not be excessive. 303s Mark 15 CB3-B916A/B917A

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3. ASSEMBLY AND ADJUSTMENT
CB3-B916A/B917A
15
3. ASSEMBLY AND ADJUSTMENT
3-1. Needle bar
1.
The screw flat of the drive shaft lever
should face up
and be inserted through the needle bar drive lever
and
set collar
.
2.
Line up the end of the drive shaft lever
with the frame
and secure with the screw
Assembly and adjustment of the sewing machine
should only be carried out by a qualified
technician.
Turn off the power switch at the following times,
otherwise the machine may operate if the pedal
is depressed by mistake, which could result in
injury.
* 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.
• When carrying out inspection, adjustment and
maintenance
• When replacing consumable parts such as the
loopers and knife.
If the power switch needs to be left on when
carrying out some adjustment, be extremely
careful to observe all safety precautions.
CAUTION
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 diarrhoea.
Keep the oil out of the reach of children.
Use only the proper replacement parts as
specified by Brother.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly
before using the machine.
Any problems in machine operation which result
from unauthorized modifications to the machine
will not be covered by the warranty.
Apply grease
301s
A
Push
lightly
302s
Mark
Mark
303s
3.
Press the set collar
gently to the needle bar drive lever
and tighten the screw.
*Make sure there is a washer put on part A of the needle
bar drive lever
.
4.
Line up the mark at the upper part of the crank rod
and
attach.
*While turning the stop cam (pulley), tighten the screw little
by little so that torque will not be excessive.
Apply grease