Brother MD-602, Service Manual, Page: 18 / 76

12
MD-602, 612
a b c
e
q
r
y
w
6.3 When using the automatic presser foot lifter
device
1. When the treadle is depressed to position
r
, the
presser foot is raised.
2. If you would like the treadle pressure to be lighter when
it is depressed forward from the 2nd step to the 1st
step, change the position of the spring from
F
to
E
.
If you would like the pedal return to be from the 2nd
step to the 1st step at this time, change the spring po-
sition from
C
to
D
.
•
When changing the spring positions from
F
to
E
and
from
C
to
D
, you must remove the three screws
q
of
the treadle unit and disconnect the treadle unit from the
control box before changing the spring positions.
A
B
6.2.1 Adjusting the treadle pressure
•
If the machine starts running at a low speed when your
foot is simply resting on the treadle, or if the treadle
pressure is too weak, adjust the position (a to c) at
which the treadle spring
q
is hooked onto the treadle
lever
w
.
Note:
The treadle pressure will increase from position a to po-
sition c.
6.2.2 Adjusting the treadle return pressure
•
Loosen the nut
e
and turn the bolt
r
. The treadle re-
turn pressure becomes heavier as the bolt
r
is tight-
ened, and becomes lighter as the bolt
r
is loosened.
6.2 Adjusting the treadle
Turn off the power switch before starting work, otherwise the motor may operate, which could result in injury.
CAUTION
Fig A Fig B
6.2.3 Adjusting the treadle stroke
•
Remove the nut
t
, and then move the connecting rod joint
y
from the position in figure A to the position in figure
B. The treadle stroke will increase by approx. 1.25 times.
Note:
This adjustment will also affect the treadle pressure and the treadle return pressure, so these settings should be
readjusted if necessary.
t
q
w
r
q
q
C
D
F
E
Treadle unit