McCulloch PRO MAC 61 59CC, PRO MAC 54 54CC manual Carburettor Adjustmentg, Routine Maintenance

UK

B)Use wedges to control the moment and direction of the fall.

3When the tree starts to fall, walk away along your preplan- ned escape path.

CUTTING FALLEN TRUNKS

4A) Limbing thick branches. For limbing and bucking leave the lower limbs to support the log off the ground.

B)Supported at one end only. Begin with a bottom cut made by the upper side of the bar (A); the depth of the cut should be about one third of the log diameter. Finnish with a top cut (B) meeting the first one. With this technique splitting, cracking can be avoided

C)Supported at both ends. Begin with a top cut about one third of the log diameter. Then finish with a bottom cut (B) meeting the first one. this technique avoids the risk of pinching the bar in the log.

D)If the log is supported along its whole length it may be cut normally from above. Take care not to touch the ground with the chain.

•When working on a slope always stand on the uphill.

•When cutting prepared timber, use clamps or chocks to secure work.

•Use extreme caution when cutting small size brush and saplings which may catch the chain and pull you off balance.

CARBURETTOR

ADJUSTMENTG

We suggest carburetor adjustments are made by an authori- zed servicing dealer.

The carburetor has three adjustment screws:

•L: The needle screw L governs the fuel flow at low speed and also the acceleration from low to full speed.

To set screw L: close screw L turning it clockwise without forcing.

Then open screw 1-1/4 full turn (counterclockwise) .

If acceleration is not smooth, open another 1/8 turn to increase fuel flow .

•H: The needle screw H governs fuel flow at high speed (throttle valve fully open).

To set hi speed screw H: close screw H turning it clockwi- se without forcing .

Then open screw 3/4-1 full turn (counterclockwise) .

If the engine speed is too high, open the screw about 1/8 turn (counterclockwise).

•I: The I (IDLE) screw controls the throttle opening to govern idle speed adjust as necessary.

CAUTION: increased idle speed may cause chain movement. The carburetor is adjusted for normal operation during pro- duction. When considerable changes of altitude require a supplementary adjustment, contact an authorised service sta- tion which offers the latest in tools, parts and technical assi- stance.

ROUTINE MAINTENANCE H

Ensure engine is always switched off before any kind of maintenance operation.

CHAIN: Check tension regularly. A new chain will require more frequent adjustment. Loosen retention nuts. Tighten chain (see assembly instructions). Tighten retention nuts and adjust.

1BAR

–Clean the bar groove (K) and check the lubrication holes (L) in the bar to ensure that they are not clogged.

–Grease sprocket periodically. Rotate sprocket and repeat.

–Rotate bar periodically to maximise bar life.

2AIR FILTER

–A dust clogged air filter may cause carburetor problems. This may prevent the engine from reaching its maximum r.p.m. and cause high fuel consumption.

–Remove cover.

–Wash filter in petrol (do not use fuel which is mixed with oil).

–The filter can also be cleaned with compressed air.

–Replace filter if damaged or if it does not seal tightly in the air box.

3SPARK PLUG

Remove and clean the spark plug every 30 hours. Check the electrode gap (0,5/0,6 mm. - 0.025 inches).

–Replace spark plug about every 100 working hours or whenever it is extremely encrusted.

–Heavily encrusted electrodes can result from an incorrect carburetor setting or from wrong fuel mixture (too much oil in the fuel mix) or a poor quality of oil in the fuel mix. Check and correct.

4OIL FILTER

The oil filter is on the end of the oil suction hose inside the oil tank.

Remove the chain catcher by twisting it anticlockwise and remove the oil filter. Use a piece of bent wire or long forceps. To remove deposits from the oil tank half-fill it with kerose- ne or petrol and shake thoroughly. Drain off and fill the tank with fresh saw chain oil.

Never use waste oil.

5FUEL FILTER

To change fuel filter remove the tank cap and pull out the filter with a piece of bent wire or long forceps. Replace the filter as shown in the illustration and reposition it.

It is recommended to replace the fuel filter at least once a year.

CHAIN BRAKE

–WARNING: Contact your service dealer if anything appears wrong with your chain brake. Do not disassem- ble or manipulate the mechanism of the chain brake.

–Clean the brake mechanism periodically (without disas- sembling it) and control the wear of the band visually.

•PERIODICALLY: It is important to clean the saw thoroughly particularly around cylinder fins to avoid overheating of the engine.

•LONG STORAGE: Empty fuel and run engine until dry.

4