Shimano ALFINE Inter-11 Dealer's Manual page 46

MAINTENANCE
For internal 11-speed (oil maintenance kit: Y13098023)
7
8
(A)
9
(B)
10
Pull the piston out slowly to draw out
the oil inside the hub shell.
(A)
Rotate the wheel slowly until the oil port
is facing up.
While being careful that the tube does
not come off the syringe, remove the
bleed nipple.
Remove the old oil from the syringe.
46
(A)
Piston
NOTICE
If the piston is pulled out quickly, air is likely
to be mixed in.
NOTICE
To make sure that the syringe does not get
caught by the chain case, etc., store the
syringe between the spokes when turning the
wheel.
(A)
Bleed nipple
(B)
10 mm spanner