JUKI PS-700 - 5. Maintenance of Sawing Machine

– 22 –
4-14. Adjusting the amount of oil in the hook
1) Loosen setscrews
❷
(4 pieces). Open cover
❶
.
2) Loosen nut
❹
. Adjust the hook oil quantity by turning oil quantity adjustment screw
❸
. The oil quantity
is increased by turning the adjustment screw in the direction of arrow
A
, or decreased by turning it in the
direction of arrow
B
.
3) After the adjustment, tighten nut
❹
and attach cover
❶
.
1. After the adjustment, check the oil quantity by running the sewing machine idle for
approximately 30 seconds, as well as by checking it in comparison with the sample showing
the adequate oil quantity. (Refer to "I-4-13. How to conrm the amount of oil (oil splashes) in
the hook" p. 21.)
2. In the case of adjusting the hook oil quantity, rstly adjust the oil quantity by turning oil
quantity adjustment screw in the direction of arrow A to increase it. Then, adjust the hook oil
quantity by turning the adjustment screw in the direction of arrow B to decrease it.
3. The hook oil quantity has been factory-adjusted at the time of shipment, based on the
maximum sewing speed of sewing machine. When the customer always operate the sewing
machine at a low speed, the hook oil quantity may run short causing a sewing machine failure.
To prevent such a failure, adjustment of the hook oil quantity is required when the customer
runs the sewing machine at a low speed at all times.
4. If the sewing machine is operated in the state that oil quantity adjustment screw
❸
of the hook
is fully tightened, oil will not ow to the oil pan. In this case, oil can leak through the hook
driving shaft causing a sewing machine failure. So, do not fully tighten oil quantity adjustment
screw
❸
. In the case the oil in the hook fails to ow even if the hook oil quantity has been
nearly maximized using oil quantity adjustment screw
❸
(the oil quantity is maximized when
the adjustment screw is fully tightened by turning it in the direction of arrow
A
), the oil wick
should be changed with a new one since the current oil wick in the hook may have been
clogged.
5. After the adjustment of the hook oil quantity, securely tighten nut
❹
so as to prevent oil
leakage through oil quantity adjustment screw
❸
section.
❶
❷
❹
❸
AB
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.