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(1) Cautions when a dry hook is used
For the dry hook (RP hook), lubrication is given to the hook race with
the use of a specific material.
In the case of continuous high-speed operation, it must be noted that
wear on the race is accelerated.
Lubricant shall not be applied to the race.
If any abrasion is perceived, change the old part with a new one.
(Cautions) The RP hook (dry hook) tends to collect thread chips
and cloth dust, and this can be a case of malfunction
and defective stitches. For this reason, it should be
cleaned periodically.
(2) Replacement of the dry hook
If a dry hook is installed according to the specifications of DDL-9000A-
S and A-M , the hook section can be treated as a device conforming
to the dry specifications and sewing can be carried out without lubrication.
* According to (7) Lubrication, set up the hook so that a very small
amount of oil is fed.
1. Take out the lubrication hook.
2. Remove the hook shaft filter asm that is mounted on the hook
shaft tip.
3. Install a lower shaft stop plug screw and O ring which is available
separately.
4. Adjust the amount of hook oil so that lubrication is maintained to a
degree wet with a small amount of hook oil.
(Cautions) 1. Do not drain oil from the oil tank.
2. Be careful not to allow the oil tank to be vacant.
This oil is used also to lubricate the lower shaft front
metal.
o Hook rattling occurs and there are
problems like heat generation and
defective stitches.
o Contamination like black ink is
caused and this becomes a cause
of thread to be stained.
o This is a cause of metal section
seizure.
o This is a cause of metal section
seizure.
6. Dry hook
Adjustment Procedure Results of Improper Adjustment
Dry hook (RP hook)
Part No. Remarks
22890206 Standard type
22890305 Surface treatment type
22890404 Type with a needle guard
Bobbin case part No. for dry hook : 22896252
Part No. Part name
11079506 Lower shaft stop plug screw
RO036080200 O Ring
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