Shimano ALFINE S7051 Series Dealer's Manual page 26

INSTALLATION
Installation of the motor unit to the hub (MU-UR510 / MU-UR500 / MU-S705)
(A)
(y)
3
(B)
Install the motor unit to the hub so that
the ● mark (x) on the motor unit is
aligned with the ● mark (y) on the hub
lock spacer.
(x)
After this, gently push the motor unit
while turning it slowly to set it correctly
until it stops turning on the hub axle.
Next, secure the motor unit by
tightening right-hand lock nut B.
(C) (z)
(x)
(y)
(z)
(A)
Motor unit ● mark
MU-UR510 / MU-UR500: Silver
MU-S705: Yellow
hub lock spacer ● mark (red)
This is the mark for which the
position was aligned in step 1.
Outer side
26
(A)
Right-hand lock nut B
(B)
Right-hand lock nut A
(C)
Motor unit
Tightening torque
6 - 10 N·m
NOTICE
Check that the guide of right-hand lock nut A
is seated securely in the guide hole on the
front of the motor unit.
Motor unit guide hole
(B) Right-hand lock nut A
guide