Assembly And Adjustment; Needle Bar - Brother CB3-B917 Service Manual

3. ASSEMBLY AND ADJUSTMENT

3. ASSEMBLY AND ADJUSTMENT
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.

3-1. Needle bar

Push
lightly
303s
15
Apply grease
301s
Apply grease
A
302s
Mark
Mark
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.
1. The screw flat of the drive shaft lever
and be inserted through the needle bar drive lever
set collar
2. Line up the end of the drive shaft lever
and secure with the screw
3. Press the set collar
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
attach.
*While turning the stop cam (pulley), tighten the screw little
by little so that torque will not be excessive.
CB3-B916A/B917A
.
gently to the needle bar drive lever
.
should face up
and
with the frame
and