Ryobi RY10521A Manuel D'utilisation page 27

 Replace and fingertighten the bar mounting
nuts. The bar must be free to move for tension
adjustment.
 Remove all slack from the chain by turning the
chain tensioning screw clockwise until the chain
seats snugly against the bar with the drive links
in the bar groove.
 Lift the tip of the guide bar up to check for sag.
 Release the tip of the guide bar and turn the
chain tensioning screw 1/2 turn clockwise.
Repeat this process until sag does not exist.
 Hold the tip of the guide bar up and tighten the
bar mounting nuts securely.
The chain is correctly tensioned when there is no
sag on the underside of the guide bar, the chain is
snug, but it can be turned by hand without binding.
Ensure that the chain brake is not set.
NOTE: If chain is too tight, it will not rotate. Loosen
the bar nuts slightly and turn the tension adjuster
1/4 turn counterclockwise. Lift the tip of the guide
bar up and retighten the bar nuts securely. Ensure
that the chain will rotate without binding.
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MAINTENANCE
Page 27 — English
BAR STUD HOLES
ADJUSTING
PIN
SPROCKET
CHAIN
TENSIONING
SCREW
BAR
CLUTCH
MOUNTING
COVER
NUTS
Fig. 39
Fig. 40