JUKI LK-1900A Series Engineer's Manual page 17

Adjustment Procedures
1. Loosen the two set screws
shaft gear .
(Caution) 1. If the lower shaft gear
the oscillator
case, refer to [(5) Lower shaft backlash adjustment
and connection/disconnection] and provide a suffi-
cient backlash.
2. The three set screws
this case, the second screw of the set screws
first. Then, the first one can be loosened.
3. Lightly swing the whole body of the oscillator
direction of the arrow. Decide the positioning of the oscillator
that it stays in the center of swinging.
4. Loosen the three set screws
tor is not displaced from the center of swinging.
(Tighten the first screw first so that it comes in contact flatly with the
oscillator shaft . Then, tighten the second one.)
5. Make backlash adjustment for the lower shaft gear
[(5) Lower shaft backlash adjustment and connection/ disconnection].
(Cautions) 1. In the case of disassembly and adjustment, grease-
up treatment is always needed for the specified
places (2 positions) and the gear area A of the oscil-
lator .
2. When the crank rod (under-cam) is removed, actions
for under-cam positioning must be taken, without fail.
Refer to [(3) Crank connecting rod connection/ dis-
connection].
Adjustment Procedures
1. Loosen the set screw
2. When the adjusting screw
regulated for the lubrication pipe left
3. After adjustments, tighten the set screw
(Cautions) 1. In the state of standard shipping, the hook lubrica-
tion reducer
ened and then return-loosened by 4 turns.
2. When reducing the oil amount, the screw should not
be tightened up fully. Tighten the hook lubrication
reducer
position, wait for half a day to see how it goes. Too
much reduction can be a cause of hook wear.
and increase the backlash of the lower
has insufficient backlash,
does not swing correctly. In such a
should have been loosened in advance. In
and then fix them so that the oscilla-
and remove it.
is tightened, the quantity of oil can be
.
to fix it.
is positioned so that it is lightly tight-
and then return it by two turns. In this
should be loosened
with a finger in the
so
, according to
– 13 –
Results of Improper Adjustment
o If the position for fixing the
oscillator is inadequate, this
can also be a cause of the
frictional wear or lock-up of the
oscillator pin, crank rod lid, under-
cam, and the crank rod.
Results of Improper Adjustment
o If the amount of hook lubricant is
reduced too much, this can be a
cause of frictional wear of the
hook race plane or lock-up.