Ryobi RY52604 Manuel de l'opérateur télécharger pdf (Page 15)

11 — English

CHAIN TENSION

See Figures 13 - 14.

WARNING:

To avoid possible serious injury, never touch or adjust the

chain while the engine is running. The saw chain is very

sharp; always wear protective gloves when performing

maintenance to the chain.

 Stop the engine 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.

NOTE: A cold chain is correctly tensioned when there is

no slack on the underside of the guide bar, the chain is

snug, but it can be turned by hand without binding.

 Chain must be re-tensioned whenever the flats on

the drive links hang out of the bar groove as shown in

figure 13.

 During normal operation, the temperature of the chain

will increase. The drive links of a correctly tensioned

warm chain will hang approximately .050 in. out of the

bar groove, as shown in figure 14.

NOTE: New chain tends to stretch; check chain tension

frequently and tension as required.

CAUTION:

Chain tensioned while warm, may be too tight upon cool-

ing. Check the “cold tension” before next use.

REPLACING THE BAR AND CHAIN

See Figures 15 - 20.

WARNING:

To avoid possible serious injury, stop engine before re-

placing the bar, chain, or performing any maintenance

operation.

 Remove the bar nut and drivecase cover.

 The bar contains a bar stud slot that fits over the bar stud.

The bar also contains a chain tensioning pin hole which

fits over the chain tensioning pin.

 Place the bar onto the bar stud so that the chain tensioning

pin fits into the chain tensioning pin hole.

 Fit the chain over the sprocket and into the bar groove.

The cutters on the top of the bar should face toward the

bar tip, in the direction of the chain rotation.

 Replace the drivecase cover and install the bar nut.

Tighten the bar nut finger tight only. The bar must be free

to move for tension adjustment.

 Remove all slack from chain by turning the chain tensioning

screw clockwise, assuring that the chain seats into the

bar groove during tensioning.

 Lift the tip of the bar up to check for sag. Release the

tip of the bar, and turn the chain tensioning screw 1/2

turn clockwise. Repeat this process until sag does not

exist.

 Hold the tip of the bar up and tighten the bar nut

securely.

 Chain is correctly tensioned when there is no slack on

the underside of the 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 nut slightly and turn adjusting screw 1/4 turn counter-

clockwise. Lift the tip of the bar up and retighten bar nut.

IDLE SPEED ADJUSTMENT

See Figure 21.

If the chain turns at idle, the idle speed screw needs adjusting

on the engine. Turn the idle speed screw counterclockwise

to reduce the idle RPM and stop the chain movement. If

the saw chain still moves at idle speed, contact a service

dealer for adjustment and discontinue use until the repair

is made.

WARNING:

The saw chain should never turn at idle. Turn the idle

speed screw counterclockwise to reduce the idle RPM

and stop the chain, or contact a service dealer for ad-

justment and discontinue use until the repair is made.

Serious personal injury may result from the saw chain

turning at idle.

AUTOMATIC BAR AND CHAIN LUBRICATION

See Figure 22.

 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 bar and chain lubricant into the bar lube reservoir.

 Replace the cap and tighten securely.

 Check and refill the bar lube reservoir every time the

engine is fueled.

NOTE: Do not use dirty, used or otherwise contaminated

lubricant. Damage may occur to the oil pump, bar, or

chain.

CHAIN MAINTENANCE

See Figure 23.

For smooth and fast cutting, the chain needs to be main-

tained properly. The following conditions indicate that the

chain requires sharpening:

MAINTENANCE

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 51 52

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Ryobi RY52604 Manuel de l'opérateur Page 15

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