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3-32 Points of adjusting and assembling of the lubrication mechanism (SS, SH)
For the SS and SH machine heads, forced lubrication to the hook is performed by the plunger pump arranged in
the hook shaft front metal. In addition, minute-quantity oil is lubricated to the needle bar through oil wick.
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Fill oil tank with JUKI New Defrix Oil No. 1 from the oil hole up to the marker line of the oil tank using oiler
supplied with the machine in the state that the machine head is tilted when the top end of the gauge of oil
amount indication window comes down to the lower marker line. Even when the gauge comes down to the
lower marker line, oil still remains in the oil tank for safety. However, fill oil tank with oil as soon as possible.
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Approximate amount of 150 cc of oil can be filled when AK device is not provided. When the AK device is
provided, the amount of oil is slightly less since the falling angle of the machine head is small.
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For the H type, especially pay attention to the decrease of oil since the amount of oil in the hook is large.
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When using the sewing machine with the head tilted to this side, the state in the oil amount indication window
does not act as reference. So, be careful. (Fill oil periodically.)
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To adjust the amount of oil in the hook, run the sewing machine at least for approximately 30 seconds continuously
and check in the state that the oil amount is stabilized.
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If the oil amount adjustment screw is excessively loosened, the O ring is removed and oil spurts out. Do not
loosen it more than 8 turns.
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Do not drain oil in the oil tank even when using the RP hook at the sewing speed of 4,000 rpm or less.
Oil is not lubricated to the hook shaft front metal and the needle bar. As a result, seizure may occur.
Set oil amount to “0” with the oil amount adjustment screw when using the RP hook.
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When removing the machine head from the table and placing it on the stand, if the machine head is laid or laid
in the opposite side, oil leaks from air vent in the oil tank. In this case, remove drain screw in the oil tank to
drain the oil, then start the work.
In addition, when attaching the drain screw, tighten it with loose tightening torque of approximate 1N•m using
a small screwdriver.
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Oil pipe once removed is likely to slip out resulting in oil leakage. When the pipe is removed, be sure to replace
it with a new one.
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When assembling the respective pipes, take care not allow them
to come in contact with moving components.
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When removing the hook shaft, be sure to remove the plunger
screw (1), and draw out the plunger from the groove of the hook
shaft.
[Phenomena and corrective measures of defective lubrication]
1) Oil does not come to the oil wick of the needle bar.
(1)
Cause and corrective measure
• Check whether the routing of oil wick from the float case is broken.
• Apply oil to pump oil into the oil wick when the machine has not been
used for a long period of time.
Phenomenon
Oil wick of the needle bar is dried up.
