Yamaha YK-X Series User Manual page 160

CHAPTER 5 Periodic Inspection
Apply grease only to
ball parts.
Do not apply grease thicker
than 0.5mm to the area above
the end face seal lip.
Harmonic grease
• Apply grease every around.
• Be cautious about the amount
of grease; amounts of the grease
applying to the area above and
below the end face seal lip are
different.
Below the end face seal lip, apply grease as thick as
the diameter of the wave generator ball.
Fig. 5-21
5-38
Wave generator ball
• Apply grease to fill the space around the ball.
End face seal lip
• Apply slight amount of grease to
the lip only.
• Remove all grease that remain
inside the lip.