Ryobi RY40505 Operator's Manual page 22

Position the chain so there is a loop at the back of the bar.
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 studs are in the long slot of the bar.
Replace the chain cover ensuring that the adjusting pin
in the chain cover is in the bar chain tensioning pin hole
and that both bar studs are securely in their respective
holes in the chain cover.
NOTE: The adjusting pin may need to be slightly reposi-
tioned with the chain tensioning screw so that it is aligned
with the position of the bar chain tensioning pin hole.
Replace the chain cover and bar mounting nuts.
Finger-tighten 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.
Hold the tip of the guide bar up and tighten the bar mount-
ing 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.
NOTE: If chain is too tight, it will not rotate. Loosen the bar
nuts slightly and turn the tension adjuster 1/4 turn counter-
clockwise. Lift the tip of the guide bar up and retighten the
bar nuts securely. Ensure that the chain will rotate without
binding.
ADJUSTING THE CHAIN TENSION
See Figures 32 - 34.
WARNING:
Stop the motor, wait for all moving parts to stop, and
remove the battery pack. Never touch or adjust the chain
while the motor is running. The saw chain is very sharp.
Always wear protective gloves when performing mainte-
nance on the chain. Failure to follow these instructions
can result in serious personal injury.
Proper chain tension is critical to the performance of your
chain saw. Always check chain tension before using the saw
and periodically until the work is complete.
A cold chain is correctly tensioned when there is no slack on
the underside of the guide bar. The chain should be snug,
but still able to be turned by hand without binding.
A warm chain is correctly tensioned when the flats on the tie
straps hang approximately .050 inches out of the bar groove.
The tip of the combination wrench provided is approximately
this size and can be used to help determine if a warm chain
is correctly tensioned.
MAINTENANCE
If adjustment is needed:
Make sure the bar mounting nuts are loosened to finger
tight.
Raise the tip of the guide bar and continue to hold up
until the end of this procedure.
Turn the chain tensioning screw clockwise until the flats
on the tie straps of the chain contact the bar, making sure
the drive links are seated inside the bar groove.
Retighten the bar mounting nuts securely.
Release the tip of the guide bar and verify the chain is now
correctly tensioned using the guidelines above.
NOTE: If the chain is too tight and will not rotate, loosen
the chain cover screw slightly, then turn the chain tension-
ing screw 1/4 turn counterclockwise. Lift up the tip of the
guide bar, retighten the chain cover screw securely, then
verify the chain will now rotate without binding.
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 35 - 37.
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 possible serious personal injury.
Use only low-kickback chain on this saw. This fast-cutting
chain will provide kickback reduction when properly main-
tained.
For smooth and fast cutting, chain needs to be maintained
properly. The chain requires sharpening when the wood chips
are small and powdery, the chain must be forced through the
wood during cutting, or the chain cuts to one side. During
maintenance of your chain, consider the following:
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.
16 - English