Husqvarna 545 Mark II Chainsaw Guide (5 Expert Woodcutting Tips)

The Husqvarna 545 Mark II: Unlocking Its Potential – Plus 5 Expert Woodcutting Tips (The Best-Kept Secret Edition)

I’m going to let you in on a little secret. The Husqvarna 545 Mark II isn’t just a chainsaw; it’s a precision wood processing tool disguised as one. Most users only scratch the surface of what this machine can truly do. I’ve spent countless hours in the woods, felling trees, bucking logs, and processing firewood, and I’ve learned that mastering the 545 Mark II is about understanding its nuances and applying techniques that go beyond the basics. This guide will dive deep into the technical aspects of this chainsaw, sharing my hard-earned knowledge and five expert woodcutting tips to help you unlock its full potential, regardless of your experience level.

Understanding the Husqvarna 545 Mark II: A Technical Overview

The Husqvarna 545 Mark II is a 50cc-class chainsaw designed for professional use, but it’s equally well-suited for serious hobbyists and small-scale logging operations. Its power-to-weight ratio makes it a versatile machine, capable of handling a wide range of tasks from felling small to medium-sized trees to limbing and bucking firewood. Let’s break down the key specifications:

• Engine Displacement: 50.1 cm³ (3.06 cu. in.)
• Power Output: 2.7 kW (3.62 hp)
• Maximum Power Speed: 9,900 rpm
• Idling Speed: 2,800 rpm
• Torque, max: 2.6 Nm at 7,200 rpm
• Fuel Tank Volume: 0.52 l (17.6 fl oz)
• Oil Tank Volume: 0.26 l (8.8 fl oz)
• Recommended Bar Length: 13-20 in (33-50 cm) – I personally prefer an 18-inch bar for most applications.
• Weight (without cutting equipment): 5.3 kg (11.7 lbs)

Technical Highlights and Unique Features

• AutoTune™: This is a crucial feature. AutoTune™ automatically adjusts the engine settings based on fuel quality, altitude, humidity, and temperature. This means consistent performance in varying conditions, saving you from constant manual adjustments. I’ve seen firsthand how AutoTune™ compensates for poor fuel quality in remote locations, preventing engine stalling and maintaining cutting efficiency.
• Air Injection™: Husqvarna’s Air Injection™ system pre-cleans the intake air, removing larger particles of dust and debris. This reduces air filter cleaning frequency and extends engine life. In dusty environments, like when cutting dry oak, Air Injection™ significantly reduces filter clogging, maintaining consistent power.
• LowVib®: The LowVib® system effectively dampens vibrations, reducing operator fatigue, especially during prolonged use. After a full day of firewood processing, the difference between a chainsaw with and without effective vibration dampening is significant – I can attest to that!
• X-Torq® Engine: This engine design reduces fuel consumption and exhaust emissions. I’ve noticed a tangible difference in fuel efficiency compared to older chainsaw models without X-Torq®, allowing me to work longer on a single tank.

Data-Backed Insights

• Fuel Consumption: Independent tests have shown that the X-Torq® engine reduces fuel consumption by up to 20% compared to conventional two-stroke engines.
• Emissions: X-Torq® engines can reduce exhaust emissions by up to 75%, contributing to a cleaner working environment.
• Vibration Levels: The LowVib® system reduces vibration levels to approximately 3.5 m/s² on the front handle and 4.5 m/s² on the rear handle, significantly below the threshold for prolonged exposure limits. These are average values; individual results may vary based on cutting conditions and operator technique.

5 Expert Woodcutting Tips for the Husqvarna 545 Mark II

These tips are based on my experience and observations, focusing on maximizing efficiency, safety, and the lifespan of your chainsaw.

1. Chain Selection and Sharpening: The Foundation of Performance

The chain is the unsung hero of any chainsaw. Choosing the right chain and maintaining its sharpness is paramount.

• Chain Type: For general woodcutting, I recommend a full-chisel chain for its aggressive cutting action. However, for harder woods or dirty conditions, a semi-chisel chain may be more durable. I’ve found that a full-chisel chain on clean hardwoods is incredibly efficient, but it dulls quickly when encountering dirt or knots.
• Chain Pitch and Gauge: Ensure the chain pitch and gauge match the specifications of your bar and sprocket. The 545 Mark II typically uses a .325″ pitch chain with a .050″ gauge.
• Sharpening: This is where many users fall short. A dull chain not only slows you down but also increases the risk of kickback and puts unnecessary strain on the engine.
  • Frequency: Sharpen your chain every time you refuel, or more often if you notice a decrease in cutting performance. I sharpen my chain after every tank of fuel, without fail. It’s a habit that pays dividends in efficiency and safety.
  • Technique: Use a chainsaw file and guide to maintain the correct filing angles (typically 30-35 degrees for the top plate and 5-10 degrees for the depth gauges). I use a Husqvarna filing kit that includes a guide to ensure consistent angles. It’s a worthwhile investment.
  • Depth Gauges: Periodically check and file down the depth gauges (rakers) to the manufacturer’s recommended height. Overly high depth gauges will cause the chain to skip and chatter, while overly low depth gauges will cause aggressive cutting and increased kickback risk.
• Chain Tension: Proper chain tension is crucial for safe and efficient cutting.
  • Adjustment: Adjust the chain tension so that the chain can be pulled around the bar by hand, but there is no excessive slack.
  • Monitoring: Check the chain tension frequently, especially when the chain is new, as it will stretch initially. I always check the chain tension after the first few cuts with a new chain.

2. Mastering Felling Techniques: Directional Control and Safety

Felling a tree is a complex process that requires careful planning and execution. Incorrect felling techniques can lead to serious injury or property damage.

• Risk Assessment: Before felling any tree, assess the surrounding area for hazards such as power lines, buildings, roads, and other trees. Identify the lean of the tree, wind direction, and any signs of decay or weakness.
• Planning the Felling Direction: Determine the desired felling direction based on the tree’s natural lean, wind direction, and the surrounding terrain.
• The Notch (Face Cut): The notch is a critical component of the felling process, as it determines the direction in which the tree will fall.
  • Types of Notches: The most common types of notches are the open-face notch and the conventional notch. I prefer the open-face notch for its wider opening angle, which provides better control over the felling direction.
  • Notch Depth: The notch should be approximately 20% of the tree’s diameter. I use a felling wedge to help open the notch and prevent the saw from pinching.
  • Notch Angle: The angle of the notch should be approximately 70-90 degrees for an open-face notch.
• The Back Cut: The back cut is made on the opposite side of the tree from the notch, leaving a hinge of wood to control the fall.
  • Hinge Width: The hinge should be approximately 10% of the tree’s diameter. I always ensure the hinge is of uniform thickness to prevent the tree from twisting during the fall.
  • Stump Shot: Leave a stump shot to further control the fall.
  • Avoiding Kickback: Be extremely cautious when making the back cut, as this is the most common point for kickback to occur. Use a plunge cut technique and maintain a firm grip on the saw.
• Using Felling Wedges: Felling wedges are invaluable tools for controlling the felling direction, especially when dealing with trees that have a strong lean or are surrounded by other trees.
  • Placement: Insert felling wedges into the back cut before completing it, and drive them in with a hammer to lift the tree in the desired direction.
  • Material: Use plastic or aluminum wedges to avoid damaging your chainsaw chain. I carry a variety of wedge sizes to accommodate different tree sizes and leans.
• Escape Route: Plan your escape route before making any cuts, and ensure that it is clear of obstacles. I always have a clear escape route planned and practiced before felling any tree.

3. Bucking Techniques: Optimizing for Firewood and Lumber

Bucking is the process of cutting felled trees into manageable lengths for firewood or lumber.

• Log Support: Always support the log before making any cuts to prevent pinching of the saw.
  • Methods: Use log stands, other logs, or wedges to support the log. I often use smaller logs as natural log stands.
• Cutting Techniques:
  • Overbucking: Cut from the top of the log downwards.
  • Underbucking: Cut from the bottom of the log upwards.
  • Combination: Use a combination of overbucking and underbucking to avoid pinching. I often use overbucking to cut halfway through the log, then switch to underbucking to complete the cut.
• Cutting Order: When bucking multiple logs from a single tree, start with the smaller diameter logs and work your way up to the larger ones.
• Firewood Length: Cut firewood to a length that is appropriate for your stove or fireplace. I typically cut my firewood to 16-inch lengths, which fit easily into my wood stove.
• Limbing: Limbing is the process of removing branches from a felled tree.
  • Safety: Be extremely cautious when limbing, as branches can spring back and cause injury.
  • Technique: Start by removing the smaller branches, and work your way up to the larger ones. Use the chainsaw to cut the branches close to the trunk. I always wear eye protection and gloves when limbing.

4. Fuel and Oil Management: Keeping Your Chainsaw Running Smoothly

Proper fuel and oil management is essential for the longevity and performance of your chainsaw.

• Fuel: Use high-quality gasoline with an octane rating of 89 or higher. Mix the gasoline with a high-quality two-stroke oil at the manufacturer’s recommended ratio (typically 50:1). I always use premium gasoline and Husqvarna two-stroke oil in my 545 Mark II.
  • Mixing: Mix the fuel and oil thoroughly in a separate container before adding it to the fuel tank.
  • Storage: Store fuel in a tightly sealed container in a cool, dry place. I never store fuel for more than 30 days, as it can degrade and cause engine problems.
• Oil: Use a high-quality bar and chain oil to lubricate the chain and bar.
  • Level: Check the oil level frequently and refill as needed.
  • Type: I recommend using a vegetable-based bar and chain oil, as it is more environmentally friendly.
• Air Filter: Clean the air filter regularly to ensure proper airflow to the engine.
  • Frequency: Clean the air filter after every 10 hours of use, or more often if you are working in dusty conditions.
  • Method: Use compressed air to blow out the dirt and debris from the air filter. I also wash the air filter with soap and water occasionally to remove stubborn dirt.

5. Maintenance and Troubleshooting: Prolonging the Life of Your Investment

Regular maintenance is crucial for keeping your Husqvarna 545 Mark II in top condition.

• Daily Maintenance:
  • Check the chain tension and sharpness.
  • Clean the air filter.
  • Check the fuel and oil levels.
  • Inspect the bar and chain for damage.
• Weekly Maintenance:
  • Clean the spark plug.
  • Grease the bar sprocket.
  • Inspect the starter rope and mechanism.
• Monthly Maintenance:
  • Clean the carburetor.
  • Check the fuel lines and filter.
  • Inspect the anti-vibration system.
• Troubleshooting:
  • Engine Won’t Start: Check the fuel level, spark plug, and air filter.
  • Engine Runs Poorly: Check the carburetor, fuel lines, and air filter.
  • Chain Won’t Cut: Check the chain sharpness and tension.
  • Chain Binds: Check the bar and chain for damage.

Case Study: Optimizing Firewood Production with the 545 Mark II

I recently undertook a project to produce 20 cords of firewood from fallen oak trees on a local farm. This project provided a valuable opportunity to optimize my firewood production techniques using the Husqvarna 545 Mark II.

• Wood Selection: The oak trees had been down for approximately six months, resulting in a moisture content ranging from 25% to 35%. According to the University of Maine, firewood should have a moisture content of less than 20% for optimal burning.
• Bucking Strategy: I employed a systematic bucking strategy, cutting the logs into 16-inch lengths and sorting them by diameter.
• Splitting: I used a hydraulic log splitter to split the larger logs, while the smaller logs were split by hand using a splitting maul.
• Drying: The firewood was stacked in a well-ventilated area to dry. Research from the Forest Products Laboratory indicates that oak firewood typically takes 6-12 months to dry to a moisture content of less than 20%.
• Results: By implementing these techniques, I was able to produce 20 cords of high-quality firewood in a timely and efficient manner. The Husqvarna 545 Mark II performed flawlessly throughout the project, demonstrating its reliability and versatility.

Safety First: A Non-Negotiable Priority

No discussion about chainsaws is complete without emphasizing safety. Chainsaws are powerful tools that can cause serious injury if used improperly.

• Personal Protective Equipment (PPE): Always wear appropriate PPE when operating a chainsaw, including:
  • Helmet: A hard hat to protect your head from falling debris.
  • Eye Protection: Safety glasses or a face shield to protect your eyes from flying debris.
  • Hearing Protection: Earplugs or earmuffs to protect your hearing from the loud noise of the chainsaw.
  • Gloves: Heavy-duty gloves to protect your hands from cuts and abrasions.
  • Chainsaw Chaps: Chainsaw chaps to protect your legs from chainsaw cuts. I consider chainsaw chaps to be the most important piece of safety equipment.
  • Steel-Toed Boots: Steel-toed boots to protect your feet from falling logs and chainsaw cuts.
• Safe Operating Practices:
  • Read and understand the chainsaw’s owner’s manual.
  • Never operate a chainsaw when you are tired or under the influence of drugs or alcohol.
  • Maintain a firm grip on the chainsaw with both hands.
  • Keep your feet firmly planted and maintain a stable stance.
  • Be aware of your surroundings and avoid cutting in hazardous conditions.
  • Never cut above shoulder height.
  • Be aware of the risk of kickback and take steps to avoid it.
  • Never allow anyone to stand in the cutting path.
• First Aid: Keep a well-stocked first aid kit on hand and know how to treat chainsaw injuries.

Conclusion: Mastering the 545 Mark II for Woodcutting Success

The Husqvarna 545 Mark II is a powerful and versatile chainsaw that, with the right knowledge and techniques, can be a valuable asset for woodcutting, logging and firewood production. By understanding its technical specifications, implementing the expert tips I’ve shared, and prioritizing safety, you can unlock its full potential and achieve woodcutting success. Remember, continuous learning and practice are key to mastering any tool, and the Husqvarna 545 Mark II is no exception. So, get out there, put these tips into practice, and experience the satisfaction of efficient and safe wood processing.

Learn more