SHOP MANUAL
GENERAL INSTRUCTIONS
Ch 0 page 40
• Apply the lube oil or grease to the surface and chamfered
edge of the shaft on which the oil seal is to be installed,
so that the shaft may be smoothly inserted into the oil seal
without pinching the lip and that a proper lubrication of
the shaft during the break-in period of the machine is
accomplished.
• Be sure to apply grease only by the fingers. Restrict
the amount of grease to be applied in the range of 40
to 60 percent of the vacancy formed between the
lips.
• When fitting an oil seal, use of a guide shown below
is recommended to prevent the lips of the oil seal
from being scratched or soiled with dust.
• Make sure that there are no scratches and dust on
the contact surface (with the shaft) of an oil seal.
• Do not use any hydraulic press to fit press-fit an oil seal.
Use only a hand press and a jig. The jig should be a snap
cylinder of 1 to 3 mm smaller in the outer diameter than
the oil seal, and the press-fit surface of the oil seal should
be free from scratches and deformation.
• When installed, the oil seal should not be inclined at an
angle. Press-fitted angle of an oil seal should not
exceed the permissable limit of 0.2 mm/100 mm diameter.
Handling of gaskets
• Discard copper gaskets whenever they are disassembled.
• Immerse leather gaskets in oil before assembly.
• Coat liquid gasket compound to the specially designated
gaskets and o-rings (specified in each step). Make sure
that the surface to be coated with liquid gasket is free
from large scratches or any other damage. Wipe off dust,
paint or oil, if any, from the surfaces to be coated with
liquid gasket. Uniformly apply liquid gasket to the contact
surface, and wait for a few minutes to allow drying of
the gasket. When the liquid gasket becomes dry enough
for the finger touch, put the gasket or o-ring in place.
Handling of o-ring seals
• Replace a seal, if rust exists on the circumference of
its contact surface.
• Apply a thin coat of oil to the contact surfaces when
installing a seal.
• Insert the o-ring in the housing groove taking care
not to twist the o-ring. An o-ring installed with a
twisting condition will jump out of the groove when
the seal is turned round under pressure.
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