Shimano Ultegra ST-6870 Dealer's Manual page 54

ADJUSTMENT
Adjustment of the rear derailleur
Next, operate shifting switch (Y) 4 times
to move the guide pulley toward the
outside by 4 steps to the target position.
6
Press the button at junction (A) until the
red LED turns off in order to switch from
rear derailleur adjustment mode to gear
shifting mode.
7
Shift to each gear and check that no
noise is generated at any gear position.
If fine adjustment is needed, switch back
to adjustment mode and readjust the
rear derailleur.
Adjustment of the low-side stopper bolt
Adjust the stopper bolt with an Allen
key.
Shift the rear derailleur to the largest
chainring, and then tighten the low
adjustment bolt until it touches against
the stopper.
If it is tightened too much, the motor
8
will detect a problem and gear shifting
operation will not be carried out
correctly.
To be continued on next page
4 steps
4 times
(H)
Turned
off
(I)
54
(H)
Junction (A)
(I)
Low-side stopper adjustment bolt
Phenomenon that occurs due to an
excessively tightened adjustment bolt
•
Gears do not shift to the top/low gear.
(Even if you shift gears to the top or low
gear, the gear may shift back by one gear
after about 5 seconds.)
•
Noise does not stop.
•
Battery charge disappears quickly. (load is
being placed on the motor)
•
The motor may be damaged. (irreparable)