Ryobi RY40406 Operator's Manual page 51

 Remove the battery pack before you do any
work on the chain saw.
 Make sure the bar mounting nuts are loosened
to finger tight.
 Turn the chain tensioning screw clockwise to
increase tension the chain.
NOTE: A cold chain is correctly tensioned when
there is no slack on the underside of the guide
bar, the chain is snug, and it can be turned by
hand without binding.
 Retension the chain whenever the flats on the
drive links hang out of the bar groove.
NOTE: During normal saw operation, the tem-
perature of the chain increases. The drive links
of a correctly tensioned warm chain will hang
approximately 0.050 in. out of the bar groove.
The tip of the supplied combination wrench can
be used as a guide to help determine the correct
warm chain tension.
NOTE: New chains tend to stretch; check the
chain tension frequently and tension as required.
NOTICE:
A chain tensioned while warm may be too tight
upon cooling. Check the "cold tension" before
next use to avoid possible injury.
CHAIN MAINTENANCE
See Figures 33 - 35.
WARNING:
Remove the battery pack and make sure the
chain has stopped before you do any work on
the saw to avoid accidental starting and pos-
sible serious personal injury.
Use only low-kickback chain on this saw. This
fast-cutting chain will provide kickback reduction
when properly maintained.
For smooth and fast cutting, chain needs to be
maintained properly. The chain requires sharpen-
ing when the wood chips are small and powdery,
the chain must be forced through the wood dur-
ing cutting, or the chain cuts to one side. During
maintenance of your chain, consider the following:
MAINTENANCE
CHECK FOR WEAR
TOP PLATE
RIVET HOLE
 Improper filing angle of the side plate can
increase the risk of a severe kickback.
 Raker (depth gauge) clearance.
• Too low increases the potential for kickback.
• Not low enough decreases cutting ability.
 If cutter teeth have hit hard objects such as nails
and stones, or have been abraded by mud or
sand on the wood, have service dealer sharpen
chain.
NOTE: Inspect the drive sprocket for wear or dam-
age when replacing the chain. If signs of wear or
damage are present in the areas indicated, have
the drive sprocket replaced by a RYOBI Service
dealer.
25 - English
RAKER CLEARANCE
.025 in.
OR DAMAGE
DRIVE SPROCKET
CUTTING
CORNER
HEEL
GULLET
Fig. 33
Fig. 34
SIDE PLATE
DEPTH GAUGE
TOE
Fig. 35