U20-3, U25-3 WSM General
I-9
(4) Oil seal
• Do not confuse the orientation of the oil
seal lips. Direct the main lip toward the oil
chamber; in other word, toward what is to
be sealed.
• If in dry state, the oil seal may wear out
when running in the machine. To prevent
this, be sure to apply lubricant (grease)
over the lip sliding surface. If provided also
with a dustproof lip, fill the space between
this lip and the main lip with grease.
• As a rule, use a press to press-fit the oil
seal. If not available, apply a suitable tool
and tap it evenly without allowing any tilt.
Press-fit the oil seal deep down to the
bottom of the oil seal fitting boss.
(5) Mounting the circlip
• Place the circlip with its sharp edge facing
outward (in the locking direction).
• Fit the circlip securely in the groove. For
the hole circlip in particular, install and turn
it slightly to make sure it fits well.
(6) Tapping the roll pin (spring pin)
• Place the roll pin (spring pin) with its
opening perpendicular to the load.
• Place the roll pin (spring pin) with its
opening in the turning direction.
• Evenly tap the roll pin (spring pin) into
position.
a. Packing f. Dustpans lip
b. Metal ring g. Atmosphere (outside)
c. Spring h. Grease
d. Main lip
e. Oil chamber (inside)
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