Ryobi RY15520 Manuel d'utilisateur télécharger pdf (Page 14)

10 — English

MAINTENANCE

WARNING:

The chain should never turn at idle when using a gas

power head. Turn the idle speed screw “T” counter-

clockwise to reduce the idle RPM and stop the chain, or

contact a service dealer for adjustment and discontinue

use until the repair is made. Serious personal injury may

result from the chain turning at idle.

CHAIN TENSION

See Figures 16 - 17.

Stop the engine or motor and remove the spark plug

wire or disconnect from power supply before setting the

chain tension. Make sure the guide bar nut is loose to

finger tight, turn the chain tensioning screw clockwise to

tension the chain. Refer to Replacing the Bar and Chain

for additional information.

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.

CAUTION:

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 approximately 8 oz.

of 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 main-

tained 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:

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 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.

HOW TO SHARPEN THE CUTTERS

See Figures 20 - 23.

WARNING:

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.

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Ryobi RY15520 Manuel d'utilisateur Page 14

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