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Adjustment Procedure
Results of Improper Adjustment
5) Adjusting the amount of oil in the hook
Tighten (turn clockwise) oil amount adjustment screw
❶
to increase the
amount of oil in the hook, or loosen (turn counterclockwise) to decrease it.
(Caution)
[When using RP hook (hook for dry head) for DDL-8000A*-MS type]
1. Remove hook driving shaft oil wick setscrew
❷
and
attach hook driving shaft stopper screw
❺
(part number
: 11079506) and O-ring
❻
(part number : RO036080200).
2. Loosen oil amount adjustment screw
❶
up to the minimum
so as to reduce the oil amount in the hook. However, do
not completely stop the oil and be careful not to allow oil
adjustment screw
❶
to come off.
3. Never drain the oil in the oil tank even when RP hook
(hook for dry head) is used.
6) Hook oil adjustment procedures
1. Tighten the hook oil quantity adjusting screw
❶
to obtain the maximum
oil rate and operate the machine for about 30 seconds.
2. Loosen the oil adjusting screw by two turns and check the quantity of oil.
In this case, give 30 seconds of idling to the sewing machine and measure
the quantity of oil at the intervals of 5 seconds (about 35 seconds in total).
3. According to the quantity of oil secured at that time, determine the
amount of turning for the hook oil quantity adjusting screw
❶
. Give
30 seconds of idling to the sewing machine after re-adjustment and
measure the quantity of oil at the intervals of 5 seconds.
4. Adjust the screw position in the procedures of 2. to 3. above until
an adequate quantity of oil has been attained.
(Caution) When the hook is replaced or in the case of the head
(including the heads in a new state) not used for a long
time, it takes about 10 to 20 seconds (4,000sti/min) until
the oil begins to appear from the hook.
The machine stays in the state of causing seizure. Therefore, use
the machine after running-in operation at 2,000sti/min or below.
7) Essentials for hook oil adjustments
1. When the quantity of hook oil is adjusted from excessive oiling
condition to reducing condition (loosening the screw), it is possible
to carry out stable adjustments.
2. Check the oil quantity about three times to confirm the stability.
3. If the quantity of oil is too much before adjustments, operate the ma-
chine continuously for about one minute so that the oil attached to the
hook and remaining in the oil path can be flung off completely.
8) Replacement of the hook shaft oil wick
Hook driving shaft stopper setscrew oil wick
❹
is a consumable
item. Periodic replacement is recommended for the stabilization of
hook oil quantity.
1. Remove the hook.
2. Remove the hook driving shaft stopper screw
❸
.
(Caution) Make sure not to hurt the tip hole of the
hook driving
shaft stopper screw
❸
.
3. Enter a new hook driving shaft stopper setscrew oil wick
❹
to the
inner part of the hook driving shaft stopper screw
❸
and then get
it around the hook shaft.
○ When you use an dry hook, buy
and mount the hook driving shaft
stopper screw
❺
and O-ring
❻
that
stop the hook oil quantity.
○ By feeding very much oil, let the
oil prevalent around the hook and
through the lubrication route as a
whole so that the oil path can be
stabilized.
<When the quantity of hook oil is too much>
○ Too much oil can stain the materials
to be sewn.
○ Oil consumption in the oil tank is
increased.
<When the quantity of hook oil is too less>
○ The lubrication route tends to be af
-
fected easily by factors such as dust.
It is, therefore, necessary to check the
condition of oil quantity periodically.
○ Under rigorous conditions (operation
at high speed or continuous opera-
tion), pay attention to the possible
occurrence of problems such as hook
seizure and thread breakage by heat.
○ If a contaminated oil is used, filter
clogging occurs earlier and this can
be a cause of unstable oil quantity.
