Careful Cutting
Working in a Winter Wonderland
By Randy Scully

With the onset of winter, thoughts shift to some of the challenges winter chain saw operation brings to the user. With a little extra care, your chain saw can offer peak performance even in the face of extreme cold temperatures. You will also need to take extra precautions for specific weather-related hazards.

Personal Protective Equipment
While working with a chain saw during the winter, as always, wear protective apparel, including hearing protection and protective gloves. In the winter wood is even more likely to splinter, so use of a helmet and eye protection remains critical. Some manufacturers offer winter protective pants made with materials that are both cut-retardant and resistant to water and snow, providing an option to the protective leg wear you would wear throughout the rest of the year.

Maintenance and Operation
The first thing to do to prepare your chain saw for use in temperatures under 40 degrees Fahrenheit is to switch the winter/summer shutter on your saw to "winter” to activate the carburetor pre-heater system, if your chain saw has this feature. Leaving the shutter on the summer position could result in carburetor icing, causing the machine to perform poorly, idle erratically and even run lean, which could eventually cause major engine failure.

Some chain saws offer special extreme cold weather features such as automatic, electrically heated carburetors and electrically heated handles that you can easily turn on and off for your comfort.

Your chain saw will require some extra maintenance during winter. The following are some basic recommendations:

• Be sure to keep the sprocket cover clean to prevent snow and moisture from freezing with sawdust and oil that normally collect around the sprocket area.
• Clean the chain brake more often, especially with chain saws that have the chain brake in the sprocket cover.
• Remove snow from around the fuel tank opening before refueling, so snow doesn't fall in the tank; water and moisture in the fuel can cause unnecessary aggravation.
• Keep the anti-vibration system free from snow and ice that could freeze and effect operation of the anti-vibration system, resulting in increased operator fatigue.
• Clean the throttle trigger interlock to ensure it remains operational while carrying the chain saw.
• Also keep the cooling air intake clean and free from snow, ice and sawdust to prevent your engine from overheating. Take care that bulkier winter clothing does not get sucked up against the cooling air intake. This can restrict air flow and cause major engine failure.
• Be extra attentive to risk-reducing features and control mechanisms on your chain saw and keep them clean.

Weather-Related Precautions
Be aware that the ground might be frozen and slippery. You will need solid footing with good traction. With all your winter tree work, take extreme care in the freezing weather. When it's windy, stormy or rainfall is heavy, consider delaying the work to avoid hazards.

Since frozen wood is harder than non-frozen wood, you may want to decrease the saw chain's filing angle by five degrees. Decreasing the chain's angle increases cutting performance in frozen woods and decreases the wear to your guide bar and saw chain.

Keep ice from building up on the handles of your chain saw to prevent your hands from slipping off the machine. Before you start felling, try to remove the snow around the trunk of the tree and knock off as much ice as possible from ice-covered trees and limbs, which pose an increased risk of falling.

As you face the challenges of winter work, taking a few extra maintenance steps and being extra alert to potential hazards can increase the productivity of your equipment and reduce the risk of injury.

Randy Scully is product service manager for Stihl Inc., based in Virginia Beach, Virginia.