U20-3, U25-3 WSM General
I-8
b. O-ring, Oil seal, Circlip and Roll
Pin
(1) General precautions
• Make sure the O-ring and the oil seal are
free of anything unusual (uneven surface,
scratches, chipping, etc.).
• Check the O-ring groove for burrs. Correct,
if any, using an oil stone or the like.
• When putting a part past a sharp edge into
position, protect such edge with a cover or
get the part chamfered.
(2) O-ring
• Clean up the O-ring groove and deburr its
edge as required.
• Before installing the ring, be sure to apply
lubricant (grease) over it. (Do not do this to
the floating seal.)
• Fit the O-ring into its groove without twist.
With your fingertip, push the ring gently and
evenly into the final position. Otherwise the
ring would easily get twisted in contact with
the inner edge of the groove.
(3) Floating seal
• Be sure to wipe oil off the O-ring and the O-
ring contact surface. (Note, however, that
oil must be applied thinly over those of the
wheel motor.)
• In fitting the O-ring into the floating seal, be
careful not to twist the O-ring.
• Before installing the floating seal together
with the O-ring, apply sealing oil thinly over
the sliding surface. Be careful to keep the
sliding surface and O-ring in alignment with
the housing.
• Finally turn the floating seal 2 or 3 times by
hand in order to form an oil film over the
sliding surface as well as to get the sealing
surface well it.
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