– 35 –
1
2
6-10. Replacing the bobbin thread slack preventer spring (for LH-4168-7 and 4188-7)
) Loosen screw
1
and remove bobbn thread
slack preventer sprng
2
from the groove on
the bobbn case.
2) Ft bobbn thread slack preventer sprng
2
whch replaces the removed sprng n the bobbn
case through the groove.
3) Fx bobbn thread slack preventer sprng
2
n
the bobbn case by tghten screw
1
. At ths
tme, carefully check the operatng range and
tenson or the sprng.
Groove
6-11. Adjusting the hook needle guard
WARNING :
Turn OFF the power switch and ascertain that the motor totally stopped before starting the work so
as to prevent personal damage caused by abrupt start of the sewing machine.
When replacing the hook, confirm the position of the needle guard.
The standard poston s the state that hook needle guard
2
comes n contact wth the sde of needle
1
and the needle s along the hook needle guard by 0 to 0. mm. If not, adjust by bendng the hook needle
guard.
) When bendng the hook needle guard nward, perform by enterng a screwdrver to the outsde of
the hook needle guard.
2) When bendng the hook needle guard outward, perform by enterng a screwdrver to the nsde of
the hook needle guard.
(Bend inward.)
(Bend outward.)
0 - 0.1 mm
1
2
2
2