Preparation Of The Sewing Machine; Method Of Lubrication - JUKI LH-3500A Series Instruction Manual

4. PREPARATION OF THE SEWING MACHINE

4-1. Method of lubrication

For this sewing machine, one of two different lubricating methods can be selected.
(1) Method of circulating lubrication (when the oil collected in the under cover is reused)
Lubrication to
hook side
Reflux oil
from hook
Filter for plunger
Urethan filter
To ensure the long service life of the sewing machine, be sure to clean up the aforementioned
filter sections (at four locations) periodically (approximately once three months). When the filter
is clogged, lubrication trouble will occur and break-down will be caused.
In addition, when the oil becomes dirty, replace the oil gathered in the oil tank and the under cov-
er.
(2) Method of non-circulation type lubrication (when only the clean oil is always used)
❸
❶
Plunger
Lubrication
❷
Oil tank
Circulation
Insert inlet port ❶ for circulation into section ❸ of
the feed box cover until it will go no further to put it
into the state as it has been delivered to your plant.
* Drain oil dropped into the under cover by remov-
ing drain screw ❷ .
When inlet port for circulation ❶ comes
in contact with the oil surface, oil is
absorbed without passing the filter. As a
result, break-down will be caused.
If inlet port ❶ for circulation is not insert-
ed into the feed box cover, oil may leak
from inlet port ❶ for circulation or the
quantity of oil in the hook may fluctuate.
– 7 –
Ball float case
Oil inlet filter
Filter for
circulation