Craftsman 46cc Manuel du propriétaire télécharger pdf (Page 21)

Fig. 27

Correct Warm Tension

Too LooseCorrect Cold Tension

ADJUSTING THE CHAIN TENSION

Check the chain tension before and during operation. Adjust the

chain tension whenever the flats on the saw chain hang out of the

bar groove (Fig. 25).

NOTE: A new saw chain tends to stretch and will need readjustment

after as few as five (5) cuts. This is normal during the break-in

period. The interval between future adjustments will lengthen

quickly.

1. Make sure the chain brake is disengaged. Refer to Testing the

Chain Brake in the Assembly section.

2. Use the multi-purpose tool or a 1/2 inch (13 mm) wrench to

slightly loosen the bar-retaining nuts (Fig. 26).

3. Hold the guide bar tip up and use a flat-head screwdriver to turn

the chain-tensioning screw (Fig. 26).

• Turn the chain-tensioning screw clockwise to tighten the saw

chain.

• Turn the chain-tensioning screw counterclockwise to loosen

the saw chain.

The desired chain tension depends upon the temperature of the

saw chain (Fig. 27).

• Cold Chain Tensioning - The saw chain should fit snuggly

against the underside of the guide bar. There should be no sag

(Fig. 27).

• Warm Chain Tensioning - The saw chain will expand as it

heats up during operation. The drive links should hang

approximately 1/16 inch (1.3 mm) out of the guide bar groove

(Fig. 27).

4. Hold the guide bar tip up and move the saw chain back and

forth along the guide bar (Fig. 28). Make sure the saw chain

moves freely and is in proper mesh with the sprocket. If the saw

chain does not move easily, slowly turn the chain-tensioning

screw counterclockwise to loosen the saw chain.

NOTE: The saw chain will not move if the chain brake is engaged.

5. Hold the guide bar tip up and securely tighten the bar-retaining nuts.

CAUTION:

The guide bar, saw chain, and saw bearings

will wear more rapidly if the saw chain is not properly

tensioned. Maintaining proper chain tension will improve

cutting performance and prolong the life of the saw chain.

CAUTION:

If the saw chain was tensioned while warm, it

may become too tight when cooled. Loosen the chain

tension after operation and check the chain tension before

the next use.

WARNING:

To prevent serious injury, never touch the

saw chain or adjust the chain tension while the unit is

running. Disconnect the spark plug wire to prevent the unit

from starting accidentally.

WARNING:

The saw chain is very sharp. Always wear

heavy-duty protective gloves when handling or performing

maintenance on the saw chain.

Fig. 25

Flats

Fig. 26

Bar-Retaining Nuts

Guide Bar Tip

Drive Links

Guide Bar

Chain-Tensioning Screw

Fig. 28

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 63 64

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Craftsman 46cc Manuel du propriétaire Page 21

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