Dry Hook; Cautions When A Dry Hook Is Used; Replacement Of The Dry Hook - JUKI DDL-9000B-SH Engineering Manual

6. Dry hook

Adjustment Procedure

(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.
Part No.
22890206
22890305
22890404
Bobbin case part No. for dry hook : 22896252

(2) Replacement of the dry hook

If a dry hook is installed according to the specifications of DDL-9000B-
S and B-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
shaft tip.
3. Install a lower shaft stop plug screw and O ring which is available
separately.
Part No.
11079506
RO036080200
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.
Dry hook (RP hook)
Remarks
Standard type
Surface treatment type
Type with a needle guard
that is mounted on the hook
Part name
Lower shaft stop plug screw
O Ring
Results of Improper Adjustment
o Hook rattling occurs and there are
o Contamination like black ink is
o This is a cause of metal section
– 87 –
problems like heat generation and
defective stitches.
caused and this becomes a cause
of thread to be stained.
seizure.