Ryobi P548 Manuel D'utilisation page 27

 Hold the chain in position on the bar and place
the loop around the sprocket.
 Fit the bar flush against the mounting surface
so that the bar mounts are in the long slot of
the bar.
 Rotate the chain tension assembly clockwise a
few turns to take up enough slack in the chain
so it stays in position.
 Replace the chain cover.
 Rotate chain cover lock knob clockwise to
tighten. The bar should still be free to move for
tension adjustment.
 Remove all slack from the chain by turning the
chain tension adjustment ring 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.
CHAIN DRIVE LINKS
SPROCKET
MAINTENANCE
BAR GROOVE
Fig. 28
CHAIN TENSION
ASSEMBLY
Fig. 29
27 - English
 Release the tip of the guide bar and turn the
chain tensioning knob 1/2 turn clockwise.
Repeat this process until sag does not exist.
 Hold the tip of the guide bar up and tighten the
chain cover lock knob.
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.
NOTE: If chain is too tight, it will not rotate. Loosen
the chain cover lock knob slightly and turn the chain
tension adjustment ring 1/4 turn counterclockwise.
Lift the tip of the guide bar up and retighten the
chain cover lock knob. Ensure that the chain will
rotate without binding.
CHAIN TENSION
ADJUSTMENT RING
CHAIN COVER
LOCK KNOB
Fig. 30
Fig. 31
Fig. 32