McCulloch MAC 20X Bedienerhandbuch PDF herunterladen (Seite 13)

I1. Brake chain with antiKICKBACK protection

ATTENTION! Do not dismantle or tamper with

the chain brake mechanism under any

circumstances. In the event of improper

functioning or need to replace a part, go only to

an authorized assistance centre.

1. Periodically clean the clutch brake and drum removing

sawdust, resin and dirt (without dismantling the brake) and

visually check the ribbon wear and tear (if the band brake

thickness is less or equal to 0.60 mm at the point of

greatest use rely upon an assistance centre authorized for

the replacement).

2. Check that the protection is complete and without evident

defects such as cracks in the material.

3. Move the protection back and forth to verify that it moves

freely and that you’re anchored well in the clutch cover.

4. Start up the saw on a stable base. See that the chain

turns freely.

5. Grip the handles with both hands.

6. Accelerate activate chain brake using the left hand

antiKICKBACK button without letting go of the handles.

The chain must block immediately (to avoid breaking the

brake itself, don’t insist with the accelerator).

I2. Accelerator Block

1. Check that the accelerator is blocked at the minimum when

in rest position.

2. Press the throttle trigger lockout device and check that it

goes back to rest position as soon as it’s released.

3. Check that the accelerator and the accelerator block move

freely and that the recall springs work correctly.

4. Start up the machine and go to maximum speed. Release

the accelerator and check that once the chain is still it

doesn’t move. If the chain moves, check the minimum

regulation (see “Regulation of the carburettor”).

I3. Chain Brake Pivot

Check that the chain stop pivot is complete and well mounted

on the saw.

I4. Rear right hand protection

Check that the protection of the right hand is complete and

without any obvious faults such as damaged material.

I5. Vibration Dampering System

Check the proper working of the dampers and that aren’t

deformed or damaged in any way.

Check that they’re anchored between the engine group and

handle group.

I6. Stop switch

Start up and check that motor shuts off bringing the switch to

the stop position.

ENGLISH - 10

L. Periodic maintenance

CHAIN SHARPENER AND CONTROL OF CUTTING DEPTH

ATTENTION! If the chain isn’t sharpened

correctly, risk increases as a consequence.

The following instructions refer exclusively to

the recommended chain. Always sharpen the

chain with motor turned off.

L1 General instructions on sharpening the chain.

The chain must always be well sharpened. If the chain doesn’t

cut without having to press the bar against the wood and

produces very fine sawdust, it is a sign the chain is not sharp.

If the cutting doesn’t produce sawdust, the chain has

completely lost its thread and in cutting you pulverize the wood.

If the chain is sharp, it moves forward in the wood itself and

produces big and long shavings.

1. The sharp part of the chain is made up of the CUTTING

MESH, with a TOOTH (A) and POINT FOR THE

CUTTING DEPTH (B). The difference in level between

these two determines the cutting depth.

L2 Sharpening of the teeth

ATTENTION! The following deviations from the

instructions for sharpening considerably

increase the tendency of KICKBACK:

• EXCESSIVE SHARPNESS ANGLE

• INSUFFICIENT SHARPNESS ANGLE

• INSUFFICIENT FILE DIAMETER

To obtain good sharpness of the chain you need A FILE

GUIDE and A ROUND FILE. The diameter of the file must be

equal to 3/16” /4,8mm.

Place the chain on the bar and stretch it using the chain

tensioner and checking that the chain has the correct tension

and that it’s blocked with the safety brake. This impedes that

chain moves sideways making the sharpening operation

more difficult.

1. Always sharpen the cutting tooth from the inside towards

the outside, slackening the pressure on the file during the

return phase.

The operation will be easier using the file guide.

During sharpening the file must be positioned so as

determine the following three corners of the cutting:

“A” upper angle 30° - 35°

“B” external side angle 85° - 90°

“C” internal side angle 60°

2. The file must be positioned and must work perpendicularly

to the bar.

3. To obtain more precise side angles we advise positioning

the file so that you vertically cross over the cutting edge of

about 0,5 mm.

Sharpen all the teeth of one side first then turn the saw over

and repeat the operation.

To obtain a uniform cutting surface in the wood, all the teeth

must be sharpened to the same length.

4. CUTTING DEPTH DELIMITER

With the sharpness of the teeth the cutting depth decreases.

Check the height of the depth delimiters after various chain

sharpenings.

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