JUKI DDL-9000A, Руководство инженера

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8) Adjustment of hook oil quantity
When the hook oil quantity adjusting screw is tightened (turned
to the right), the amount of hook oil is increased. When it is loosened
(turned to the left), the amount of hook oil is decreased.
9) Hook oil adjustment procedures
1. Tighten the hook oil quantity adjusting screw
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 . 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.
(Cautions) 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 (4,000rpm) until
the oil begins to appear from the hook.
he machine stays in the state of causing seizure.
Therefore, use the machine after running-in operation
at 2,000rpm or below.
10) 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
machine continuously for about one minute so that the oil attached
to the hook and remaining in the oil path can be flung off completely.
11) Replacement of the hook shaft oil wick
The hook shaft filter is a consumable item.
Periodic replacement is recommended for the stabilization of hook
oil quantity.
1. Remove the hook.
2. Remove the hook shaft filter screw
.
(Cautions) Make sure not to hurt the tip hole of the hook shaft
filter screw .
3. Enter a new hook shaft filter to the inner part of the hook shaft
filter screw and then get it around the hook shaft.
o 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>
o To o m u c h o i l c a n s t a i n t h e
materials to be sewn.
o Oil consumption in the oil tank is
increased.
<When the quantity of hook oil is too
less>
o The lubrication route tends to be
affected easily by factors such as
dust. It is, therefore, necessary to
check the condition of oil quantity
periodically.
o Under rigorous conditions (operation
at high speed or continuous
operation), pay attention to the
possible occurrence of problems such
as hook seizure and thread breakage
by heat.
o If a contaminated oil is used, filter
clogging occurs earlier and this
can be a cause of unstable oil
quantity.
Adjustment Procedure Results of Improper Adjustment
Part name Part No.
Hook shaft filter asm. 22916555
Hook shaft filter screw 22916506
Hook shaft filter 22916605