Usage, Carburettor Adjustment, Felling Trees

FUSAGE

IMPORTANT. Before using a chain saw read carefully the Operator’s Manual and all safety precautions carefully.

FELLING TREES.

-Make sure that there are no bystanders or animals in the work area.

-Study the direction of the fall of the tree and then plan your exit path away from the planned direction of fall.

-Don’t fell trees when there is a strong wind.

1 Clear the tree base of interfering limbs and brush. Clean the work area from stones or other objects which could damage the chain. If the tree has large protruding roots, remove them before felling (see illustrations).

2A) Cut a felling notch (A) of 45°on the side you want the tree to fall to a depth of about one third of the trunk diameter (d).

Then make a felling cut (B) about 5 cm higher than the felling notch on the opposite side of the tree. Make sure that the felling cut does not go right through the trunk. A hinge (C) must always be left to provide control over the direction of the fall.

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

3When the tree starts to fall, walk away along your preplanned 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 (A). Finish 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.

GCARBURETTOR

ADJUSTMENT

N.B. We suggest carburetor adjustments are made by an authorized service dealer.

The carburetor has three adjustment possibilities:

•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 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 clockwise without forcing .

Then open screw 1-1/2 full turn (counter- clockwise) .

If the engine speed is too high (the maximum speed with bar and chain on should not exceed 11.500 min-1), open the screw about 1/8 turn (counterclockwise).

•I: The (I IDLE) screw controls the throttle opening to govern idle speed (2.500 min-1).

CAUTION: increased idle speed may cause chain movement. The carburator is adjusted for normal operation during production. Wen considerable changes of altitude require a supplementary adjustment, contact an authorised service station which offers the latest in tools, parts and technical assistance.

HROUTINE

MAINTENANCE

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

PRO MAC 72 specifications

The McCulloch PRO MAC 72 is a classic chainsaw, highly regarded by tree care professionals and woodcutters alike. Introduced in the late 1980s, it quickly gained a reputation for its robust build and reliable performance, making it a prized possession among those who value quality tools.

At the heart of the PRO MAC 72 is a powerful 72cc two-stroke engine, which delivers an impressive output that ensures strong cutting performance. This robust engine design allows for efficient power delivery, enabling the chainsaw to tackle even the most challenging tasks with relative ease. With a maximum speed of around 13,000 RPM, it can handle hardwoods and dense materials that would often be problematic for less powerful saws.

One of the standout features of the McCulloch PRO MAC 72 is its lightweight construction, considering its power. Weighing in at around 11.5 pounds, it strikes a balance between portability and stability, allowing users to operate it for extended periods without excessive fatigue. Its ergonomic handle design also enhances comfort and control, facilitating high maneuverability as you navigate through various cutting scenarios.

The chainsaw is equipped with an automatic oiling system that continuously lubricates the chain, ensuring optimal performance and reducing wear during operation. This feature not only prolongs the lifespan of the chain but also minimizes maintenance requirements, allowing users to focus on their cutting tasks without frequent interruptions.

Safety is a primary concern with any chainsaw, and the PRO MAC 72 incorporates several safety features to protect the user. It is outfitted with a chain brake system that engages automatically in the event of kickback, providing a critical layer of safety while in use. Additionally, the throttle lock ensures that inadvertent acceleration is minimized, keeping the operator secure while handling the saw.

Durability is another hallmark characteristic of the McCulloch PRO MAC 72. Built with high-quality materials, it withstands the rigors of daily use in demanding environments. Whether used in forestry, landscaping, or construction, the chainsaw's rugged design ensures that it remains functional and reliable.

In summary, the McCulloch PRO MAC 72 chainsaw is a blend of power, durability, and user-centric design. With its efficient engine, lightweight structure, automatic lubrication system, and essential safety features, it continues to be a favored choice among professionals needing a trusted tool for demanding cutting tasks. Those who invest in a PRO MAC 72 can expect not only impressive performance but also reliability that stands the test of time.