Mtd 1642AVCC Manuel d'utilisateur télécharger pdf (Page 14)

SAW CHAIN TENSION ADJUSTMENT

Proper tension of saw chain is extremely important and

must be checked before starting, as well as during any

cutting operation.

Taking the time to make needed adjustments to the saw

chain will result in improved cutting performance and

prolonged chain life.

To adjust the saw chain:

1. Loosen bar nut, hold nose of guide bar up and turn

adjustment screw (D) CLOCKWISE to increase chain

tension. Turning screw COUNTERCLOCKWISE will

decrease amount of tension on chain. Ensure the chain

fits snugly all the way around the guide bar (Fig. 22).

Always use

protective gloves

when handling the saw chain.

WARNING:

Fig. 23

Fig. 22

2. After making adjustment, and while still holding nose

of bar in the uppermost position, tighten the bar

retaining nut securely. Chain has proper tension

when it has a snug fit all around and can be pulled

around by gloved hand.

NOTE: If chain is difficult to rotate on guide bar or if it

binds, too much tension has been applied. This

requires minor adjustment as follows:

Loosen the bar retaining nut so it is finger tight.

Decrease tension by turning the bar adjustment

screw COUNTERCLOCKWISE slowly. Move chain

back and forth on bar. Continue to adjust until chain

rotates freely, but fits snugly. Increase tension by

turning bar adjustment screw CLOCKWISE.

B. When saw chain has proper tension, hold nose of bar

in uppermost position and tighten the bar retaining

nut securely.

A new saw chain

stretches, requiring

adjustment after as few as 5 cuts. This is normal

with a new chain, and the interval between

future adjustments will lengthen quickly.

CAUTION:

saw chain is TOO

LOOSE or TOO

TIGHT, the sprocket, bar, chain, and

crankshaft bearings will wear more rapidly.

Study Fig. 23 for information concerning

correct cold tension (A), correct warm

tension (B), and as a guide for when saw

chain needs adjusdjtment (C).

CAUTION:

Fig. 24

CHAIN BRAKE MECHANICAL TEST

Your chain saw is equipped with a Chain Brake

that

reduces possibility of injury due to kickback. The brake

is activated if pressure is applied against brake lever

when, as in the event of kickback, operator’s hand

strikes the lever. When the brake is actuated, chain

movement stops abruptly.

To Test the Chain Brake

1. The Chain Brake

is DISENGAGED (chain can move)

when BRAKE LEVER IS PULLED BACK AND

LOCKED (A, Fig. 24).

2. The Chain Brake

is ENGAGED (chain is stopped)

when brake lever is in forward position. You should

not be able to move chain (B, Fig. 24).

NOTE: The brake lever should snap into both positions.

If strong resistance is felt, or lever does not move

into either position, do not use your saw. Take it

immediately to a Authorized Service Center for

repair. Call 1-800-520-5520 for more information.

The purpose of the

Chain Brake

is to

reduce the possibility of injury due to

kickback; however, it cannot provide the

intended measure of protection if the saw is

operated carelessly.

Always test the Chain Brake

before using

your saw and periodically while on the job.

WARNING:

REMOVING AND INSTALLING THE GUIDE BAR

1. Make sure the Chain Brake

lever is pulled back into

the DISENGAGED position (Fig. 17).

2. Remove the bar retaining nut (B1) and the screw (B2)

at rear of clutch cover (C). Remove clutch cover (C)

by pulling straight out, some force may be required.

(Fig. 18). Remove bar and chain.

3. To install bar, place the slotted end of the guide bar

over the bar bolt (F). Slide guide bar behind clutch

drum (G) until the guide bar stops (Fig. 19).

INSTALLING A CHAIN

1. Spread chain out in a loop with cutting edges (A)

pointing CLOCKWISE around loop (Fig. 20).

2. Slip the chain around the sprocket (B) behind the

clutch (C). Make sure the links fit between the

sprocket teeth (Fig. 21).

3. Guide the drive links into the groove (D) and around

the end of the bar (Fig. 21).

NOTE: The saw chain may droop slightly on the lower

part of bar. This is normal.

4. Pull guide bar forward until chain is snug. Ensure all

drive links are in the bar groove.

5. Install the clutch cover. Make sure the chain does

not slip off of the bar. Install the bar retaining nut

hand tight and follow tension adjustment instructions

in the next section. Replace screw at rear of clutch

cover.

NOTE: The guide bar retaining nut is installed only hand

tight at this point because saw chain adjustment

is required. Follow instructions in Saw Chain

Tension Adjustment.

Always use

protective gloves

when handling the saw chain.

WARNING:

To ensure the bar and

chain receive oil, ONLY

USE THE ORIGINAL STYLE BAR with the oil

passage hole (A) as illustrated in Fig. 17.

CAUTION:

Fig. 17

Fig. 18

Fig. 19

Fig. 20

Fig. 21

MAINTENANCE AND REPAIR INSTRUCTIONS MAINTENANCE AND REPAIR INSTRUCTIONS

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Mtd 1642AVCC Manuel d'utilisateur Page 14

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