Ryobi RY40PH01 Manuel D'utilisation page 44

„ A cold chain is correctly tensioned when there is no slack
on the underside of the guide bar and the chain is snug,
but can be turned by hand without binding.
„ The chain must be re-tensioned whenever the flats on
the drive links hang out of the bar groove.
„ During normal operation, the temperature of the chain will
increase. The drive links of a correctly tensioned warm
chain will hang approximately .050 in. (1.25 mm) out of
the bar groove.
NOTE: New chains tend to stretch; check 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.
CHAIN OILER
See Figure 18.
„ Use Premium Bar and Chain Lubricant. It is designed
for chains and chain oilers and is formulated to perform
over a wide temperature range with no dilution required.
„ Remove the cap and carefully pour the bar and chain
lubricant into the chain oiler tank.
„ Replace the cap and tighten securely.
„ Check and refill the chain oiler tank every hour when using
an electric power head or every time the engine is fueled
when using a gas power head.
NOTE: Do not use dirty, used, or otherwise contaminated
lubricants. Damage may occur to the oil pump, bar, or
chain.
CHAIN MAINTENANCE
See Figure 19.
WARNING:
The chain is very sharp; always wear protective gloves
when performing maintenance to the chain.
Use only the replacement low kickback chain specified for
this unit.
For smooth and fast cutting, the 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 the chain, consider the following:
MAINTENANCE
„ Improper filing angle of the side plate can increase the
risk of a severe kickback.
„ Depth gauge (or raker clearance) setting determines the
height the cutter enters the wood and the size of the wood
chip that is removed. Too much clearance increases the
potential for kickback. Too little clearance decreases the
size of the wood chip thus decreasing the chain's cut-
ting 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.
HOW TO SHARPEN THE CUTTERS
See Figures 20 - 22.
Improper chain sharpening increases the potential of
kickback. Failure to replace or repair damaged chain can
cause serious injury.
Be careful to file all cutters to the specified angles and to
the same length, as fast cutting can be obtained only when
all cutters are uniform.
„ Tighten the chain tension enough that the chain does not
wobble. Do all of your filing at the mid-point of the bar.
Wear gloves for protection.
„ Use a 5/32 in. diameter round file and holder.
„ Keep the file level with the top plate of the tooth. Do not
let the file dip or rock.
„ Using light but firm pressure, stroke towards the front
corner of the tooth. Lift file away from the steel on each
return stroke.
„ Put a few firm strokes on every tooth. File all left hand
cutters in one direction. Then move to the other side and
file the right hand cutters in the opposite direction. Oc-
casionally remove filings from the file with a wire brush.
NOTICE:
Dull or improperly sharpened chain can cause excessive
engine or motor speed during cutting, which may result
in severe engine or motor damage.
ATTACHING THE STORAGE HANGER
See Figure 23.
There are two ways to hang the attachment for storage.
„ To use the hanger cap, push in the button and place the
hanger cap over the end of the attachment shaft. Slightly
rotate the cap from side to side until the button locks
into place.
„ The secondary hole in the attachment shaft can be used
for hanging purposes as well.
10 — English
WARNING: