17
Caution
▶
When checking the oil level in the hook, keep your hands or oil flow checking paper away
from any moving parts including transfer tools, to avoid injury.
5) Lubrication Adjustment of Hook
(1) Checking the oil supply level of hook
A. After racing the sewing machine for three minutes (at
an appropriate speed), secure the oil flow checking
paper as shown in Fig. 22 and run the machine for
about five seconds. Then check the oil tape marked
on the paper.
B. Check the oil supply level three times. The
appropriate level of oil is when the oil level neither
exceeds the maximum amount nor falls below the
minimum level. (Insufficient oil would jam the hook,
whereas excessive oil would contaminate the sewing
material with oil.)
(2) Adjustment of the Oil Supply Level
Turn the oil flow adjusting screw
①
in the lower shaft
front bushing in a clockwise direction for more oil flow.
Turn it counterclockwise for less oil.
[Fig. 22]
Caution
▶
Turn off the power when adjusting the lower thread tension. If the operator mistakenly steps
down on the pedal while switched on, the machine will start automatically and can cause
physical injuries.
▶
When using the clutch motor, be aware that the motor will continue to rotate for a while after
the power is switched off. Start to work only after the motor has come to a complete stop.
3~10mm
about 0.5mm
Hook
Bed
Oil Flow
Checking Paper
Resulting Oil Tape
Minimum
Optimum Level
about 1mm
Resulting Oil Tape
Maximum
Optimum Level
Less
More
Oil Fan
Keystone Sewing Machine Company, Inc.
