Shimano SM-CD800 Dealer's Manual page 15

INSTALLATION/REMOVAL
Direct mount type
3.
Adjust the height of the guide.
(1) Loosen the guide mounting bolt half a turn.
* When the guide mounting bolt is loosened, the guide can be moved up and down.
Be careful not to loosen the bolt excessively, as this will increase the looseness of the
guide and make position alignment difficult to perform.
(2) Adjust the vertical position of the guide.
* Set the guide so that the bottom edge of the chain and the bottom edge of the
guide overlap when viewed from the right crank side.
* Do not tighten the guide mounting bolt at this time.
(1)
Guide mounting bolt
(2)
Guide
Bottom edge of the
chain
15
Bottom edge of the
guide