Ryobi P548 Operator's Manual page 26

 Remove the battery pack before you do any
work on the chain saw.
 Rotate the chain cover lock knob counterclock-
wise until chain cover can be removed.
 Remove the chain cover.
 Rotate the chain tension assembly completely
counterclockwise.
 Remove the bar and chain from mounting surface.
 Remove the old chain from the bar.
 Remove the screw and chain tension assembly
from the old bar.
CHAIN TENSION
ADJUSTMENT RING
BAR
MOUNTS
CHAIN
COVER
CHAIN TENSION
MAINTENANCE
CHAIN COVER
LOCK KNOB
Fig. 24
CHAIN TENSION
ASSEMBLY
CHAIN COVER
LOCK KNOB
ADJUSTMENT
RING
Fig. 25
 Install the chain tension assembly on the new
bar by inserting the tab into one bar hole and
installing the screw through the other. Tighten
securely.
 Lay out the new saw chain in a loop and
straighten any kinks. The cutters should face in
the direction of chain rotation. If they face the
opposite direction, turn the loop over.
 Place the chain drive links into the bar groove
as shown.
NOTE: Make certain of direction of chain.
 Position the chain so there is a loop at the back
of the bar.
SCREW
CHAIN
26 - English
TAB
CUTTERS CHAIN ROTATION
CHAIN DRIVE LINKS
CHAIN
TENSION
ASSEMBLY
Fig. 26
Fig. 27