The feed driving and feed regulating
mechanisms
as well as the hook shaft
driving gears in the gear cose ore lubricated by means of two oil-soaked foam
rubber
sheets.
To change the oil (once a year is sufficient), tilt back the machine and remove
the
gear
case cover. The foam rubber sheet should be woshed thoroughly in
order to remove the metal grit which has accumulated on it.
In most
instances,
however,
it will be
better
to insert new
foam
rubber
sheets
(Nos.
69299
and
69302)
which must be soaked with 17 oz, or 160 ccm, of the
same
oil as is used in the hook lubrication system, namely 2.7°E/50°C
(No. 120110).
When you replace the foam rubber sheet, make sure that it fits properly. The
large spur gear should run freely in the cutout of the sheet. The oscillating feed
rock shaft is grease-lubricated. Grease nipple N closes the left end of the shaft
(Fig. 8).
When screwing on the gear cose cover, make sure that the gasket is not
defective and that the
screws
are lightened
uniformly
in order to prevent oil
from
seeping
out.
Note
In replenishing the oil supply for the sewing hook, take care that no air bubble
forms in the oil line to the centrifugal switch because this would interrupt the
flow
of
oil.
The simplest procedure for removing an air bubble from the oil line ahead of
the centrifugal
switch
is as follows:
Pull
the left end of the oil tube off the
nipple and hold it up so that the air bubble rises to the surface. Then replace
the oil
tube
on the nipple carefully.
An air bubble which may hove formed in the left section of the oil tube is of no
consequence because it can escape
through
the regulating valve
(Fig.
10).
14
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