Can I change a Stihl chainsaw chain myself? Yes, you absolutely can! Changing a Stihl chainsaw chain is a straightforward maintenance task that most homeowners can perform with the right guidance and tools. This comprehensive guide will walk you through every step of a Stihl chainsaw chain replacement, ensuring your saw is always ready for action. We’ll cover everything from identifying the correct chain to the final tension adjustments, making your Stihl chainsaw maintenance a breeze.
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Why You Need to Know How to Change Your Stihl Chainsaw Chain
A sharp, properly tensioned chain is the heart of a powerful and safe chainsaw. A dull or loose chain not only cuts poorly, making your work harder and slower, but it can also be dangerous. It can cause the saw to “kickback” – a sudden, violent upward and backward movement of the chainsaw – which is a leading cause of serious injury for chainsaw operators. Knowing how to perform a Stihl chainsaw chain replacement is a fundamental skill for any chainsaw owner.
Signs Your Stihl Chainsaw Chain Needs Replacing
Before diving into the “how-to,” let’s identify when a Stihl chainsaw chain replacement is necessary.
- Dullness: The most obvious sign is a dull chain. Instead of clean, fine sawdust, a dull chain will produce coarse wood chips or even just scorch the wood. You’ll have to force the saw through the wood.
- Teeth Damage: Look for broken teeth, chipped teeth, or teeth that are worn down unevenly. Damaged teeth cannot cut effectively and can be a safety hazard.
- Stretching: Chains naturally stretch over time. If you find yourself constantly adjusting the tension, and it still feels loose shortly after, the chain might be worn out.
- Chain “Jumping”: If the chain frequently comes off the guide bar, it’s a strong indicator of a worn-out chain or improper tension.
- Excessive Heat: A chain that is too tight or dull can cause the bar and chain to overheat, leading to premature wear and potential damage.
Preparing for Your Stihl Chainsaw Chain Replacement
Before you start, gather your Stihl chainsaw parts and tools. Having everything ready will make the process smooth and efficient.
Essential Tools and Parts
- New Stihl Chainsaw Chain: This is the most crucial part. You need to ensure you have the correct chain for your specific Stihl chainsaw model.
- Owner’s Manual: Always refer to your Stihl owner’s manual. It contains specific instructions and chain specifications for your particular saw.
- Spark Plug Wrench / Scrench: Most Stihl chainsaws come with a combination tool (often called a “scrench”) that fits the bar nuts and spark plug.
- Gloves: Work gloves are essential for protecting your hands from sharp chain teeth and preventing dirt from getting into the mechanism.
- Safety Glasses: Always wear safety glasses to protect your eyes from flying debris.
- Bar Groove Cleaner: A small tool to clean out debris from the guide bar groove.
- Flathead Screwdriver (Optional): Sometimes useful for prying or cleaning.
- Rag: For wiping down parts.
Identifying Your Stihl Chainsaw Model Number and Chain Specifications
This is a critical step. Using the wrong chain can damage your saw and be dangerous.
- Find Your Model Number: Your Stihl chainsaw model number is usually located on a sticker or plate on the saw’s housing, often near the starter pull or on the top cover. It might look something like “MS 250,” “MS 170,” or “Farm Boss.”
- Chain Specifications: Once you have your model number, you can find the correct chain specifications. These are typically printed on the Stihl chainsaw guide bar itself or in your owner’s manual. The key specifications are:
- Gauge: The thickness of the drive links. Common gauges are .050″ (1.3mm) and .063″ (1.6mm).
- Pitch: The distance between drive links, measured from the rivet of one drive link to the rivet of the next, then divided by two. Common pitches are 3/8″ and .325″.
- Number of Drive Links: This is the number of teeth on the chain that engage with the drive sprocket.
You can also find this information on the packaging of your old chain if you still have it. If you’re unsure, contact your local Stihl dealer with your chainsaw model number. They can help you find the exact Stihl chainsaw parts you need.
Step-by-Step: How to Change a Stihl Chainsaw Chain
Now that you have your new chain and tools, let’s get to work. Remember to always prioritize Stihl chainsaw safety.
Step 1: Safety First! Prepare Your Chainsaw
- Turn Off the Engine: Ensure the chainsaw is completely turned off. The engine should be cool.
- Engage the Chain Brake: Flip the chain brake lever forward towards the front of the saw. This will lock the chain and prevent it from moving accidentally.
- Place the Chainsaw on a Stable Surface: Find a flat, firm area to work. This prevents the saw from rolling or moving.
Step 2: Loosen the Bar Nuts
- Locate the Bar Nuts: These are the nuts that secure the guide bar to the chainsaw body. There are usually two or three of them, located on the side of the saw where the bar attaches.
- Use Your Scrench: Use the appropriate end of your scrench to loosen these nuts. You don’t need to remove them completely, just loosen them enough so that the guide bar can move slightly. This will allow you to adjust the tension later.
Step 3: Access the Chain and Bar
- Remove the Chain Brake Handle (if necessary): On some models, the chain brake handle might need to be removed or swung out of the way to access the bar nuts. Consult your manual if unsure.
- Loosen the Tensioning Screw: Most Stihl chainsaws have a chain tensioning screw located on the side of the powerhead, near the guide bar. This screw is used to adjust the chain tension. Turn this screw counter-clockwise to loosen the chain. You might need a flathead screwdriver for this on some models.
Step 4: Remove the Old Chain and Guide Bar
- Guide the Chain Off the Bar: Once the bar nuts are loose and the tension is released, you can slide the guide bar forward slightly. Carefully lift the old chain off the guide bar and the drive sprocket.
- Remove the Guide Bar (Optional but Recommended): For a thorough cleaning and inspection, it’s a good idea to remove the guide bar completely. Once the nuts are loosened and the chain is off, you should be able to lift the bar away from the saw.
Step 5: Clean the Guide Bar and Drive Sprocket
This is a crucial part of Stihl chainsaw maintenance and can extend the life of your new chain and bar.
- Clean the Bar Groove: Use your bar groove cleaner or a small screwdriver to remove sawdust, wood debris, and any caked-on sap from the groove of the guide bar. A clean groove ensures the chain sits properly.
- Inspect the Drive Sprocket: Check the drive sprocket for wear. If the teeth are hooked or worn down, it might be time to consider a Stihl chainsaw bar replacement or at least a sprocket replacement. The drive sprocket is what drives the chain, so a worn sprocket will quickly damage a new chain.
- Clean Around the Powerhead: Wipe down the area around the clutch and drive sprocket on the chainsaw body to remove any debris.
Step 6: Install the New Chain
- Orient the Chain Correctly: This is very important! Chainsaw chains have cutters that are angled to cut in a specific direction. The cutting edge of the teeth should face forward, towards the tip of the guide bar. Most chains will have an arrow indicating the direction of rotation; ensure this matches the direction your saw spins.
- Place the New Chain on the Guide Bar: Lay the new chain into the groove of the guide bar, starting from the tip and working your way around towards the base.
- Fit the Drive Links: Ensure that the drive links of the chain fit into the groove of the guide bar all the way around.
Step 7: Mount the Guide Bar and Tension the Chain
- Position the Guide Bar: Place the guide bar back onto the chainsaw, aligning the bar studs with the holes in the mounting plate on the saw.
- Engage the Drive Sprocket: Carefully guide the drive links of the new chain onto the drive sprocket. You might need to rotate the sprocket slightly to help it engage.
- Initial Tension Adjustment: While holding the guide bar in place, use your scrench to tighten the bar nuts slightly. This will hold the bar in position but still allow for adjustment.
- Tensioning the Chain: Locate the chain tensioning screw again. Turn the screw clockwise to tighten the chain.
How to Achieve Proper Stihl Chainsaw Tension Adjustment
This is arguably the most critical step after installing the chain.
- The “Snug but Movable” Rule: The goal is to have the chain tight enough so it doesn’t fall off, but loose enough that you can still move it around the bar by hand.
- The Hand Test: Put on your gloves. Grip the chain on the top of the guide bar, midway between the clutch and the bar nose. You should be able to pull the chain around the bar. It should be snug against the bar, but not so tight that you can’t move it.
- Check for Sag: The chain should not have any slack that hangs down below the guide bar. If you can see a noticeable sag or if it feels very loose, tighten it further.
- Adjust in Small Increments: Make small turns of the tensioning screw and re-test. It’s better to over-adjust slightly and then loosen than to have a chain that’s too loose.
Step 8: Final Tightening and Testing
- Tighten the Bar Nuts: Once you have the correct tension, firmly tighten the bar nuts with your scrench. Make sure they are snug.
- Re-Check Tension: After tightening the bar nuts, test the chain tension one last time. Sometimes, tightening the nuts can slightly alter the tension.
- Test Run: With the chain brake still engaged, start the chainsaw. Once it’s running, disengage the chain brake.
- Listen: Listen for any unusual noises.
- Spin Test: Gently squeeze the throttle. The chain should spin freely around the bar. If it doesn’t, or if it feels “draggy,” turn the saw off, disengage the brake, and slightly loosen the tensioning screw.
- Check Tension Again: After a short run, turn off the saw and let it cool slightly. Re-check the chain tension. Chains often stretch a bit when new.
Stihl Chainsaw Maintenance Beyond Chain Replacement
Regular Stihl chainsaw maintenance will keep your saw running efficiently and safely for years.
Lubrication is Key
- Automatic Oiler: Stihl chainsaws have an automatic oiler that dispenses bar and chain oil as you cut. Ensure the oil reservoir is filled with proper bar and chain oil. Never use motor oil.
- Manual Oiling: If you’re cutting in very dusty or difficult conditions, or if you suspect the automatic oiler isn’t working optimally, you can manually apply oil to the chain and bar occasionally.
Sharpening Your Stihl Chainsaw Chain
A sharp chain is crucial for efficient cutting and safety. You don’t always need to replace the chain; often, Stihl chainsaw sharpening is all that’s required.
- When to Sharpen: Sharpen when you notice reduced cutting performance, the saw starts to “wander,” or you’re producing shavings instead of sawdust.
- Tools: You’ll need a round file of the correct size (specified in your owner’s manual), a file guide, and a flat file for the depth gauges.
- Technique: The process involves filing each tooth at the correct angle and depth. It’s a skill that takes practice to master. Many people opt for professional sharpening services. If you plan to do it yourself, thoroughly research the proper technique for your specific chain type.
Stihl Chainsaw Bar Maintenance
- Lubrication Hole: Ensure the small oil hole on the guide bar is clear. This hole delivers oil to the bar groove.
- Wear and Tear: Over time, the guide bar can wear down. The groove can become wider, and the edges can become sharp or worn.
- Flipping the Bar: For even wear, flip the guide bar over every time you change the chain. This helps ensure both sides of the bar wear evenly.
- Replacing the Bar: If the guide bar is heavily worn, damaged, or the groove is excessively wide, it’s time for a Stihl chainsaw bar replacement. A worn bar can cause the chain to run loosely, increasing the risk of kickback.
Troubleshooting Common Chain Issues
Even with a new chain, you might encounter problems.
- Chain Too Loose: This is the most common issue. Re-tension the chain. If it’s still loose after adjusting to the maximum, the chain might be too long for the bar, or the drive sprocket might be worn.
- Chain Too Tight: The chain will be difficult to move by hand, and the saw may overheat or strain. Loosen the tensioning screw slightly.
- Chain Coming Off: This is usually due to a loose chain, a worn drive sprocket, or a damaged guide bar. Check all these components.
- Chain Not Spinning: Ensure the chain brake is disengaged. Check that the clutch is engaging properly and that the drive sprocket is turning. If the chain is very tight, it might not spin.
Frequently Asked Questions (FAQ)
Q1: How often should I change my Stihl chainsaw chain?
A1: The lifespan of a Stihl chainsaw chain depends heavily on usage, the type of wood you’re cutting, and how well you maintain it. Generally, you’ll replace a chain when it’s dull to the point that sharpening no longer restores its cutting ability, or if you notice damage to the teeth. Many users replace a chain after a few sharpenings, or when they notice a significant drop in performance.
Q2: Can I use a chain from another brand on my Stihl chainsaw?
A2: While theoretically possible if the pitch, gauge, and drive link count match, it’s generally recommended to use genuine Stihl chainsaw parts or high-quality aftermarket parts specifically designed for your Stihl model. Stihl designs their chains and bars to work optimally together for performance and safety.
Q3: My new chain feels loose after cutting for a few minutes. What should I do?
A3: This is normal for a new chain. New chains tend to stretch a bit during their initial use. Always re-check and adjust the chain tension after the first few minutes of operation, and periodically thereafter. This is a critical part of Stihl chainsaw safety and performance.
Q4: What is the difference between 3/8″ and .325″ pitch chains?
A4: Pitch refers to the spacing between the drive links. A 3/8″ pitch chain is larger and more aggressive, generally used on larger, more powerful chainsaws for heavy-duty cutting. A .325″ pitch chain is smaller and often found on mid-sized saws for general-purpose use. Using the correct pitch for your saw is essential.
Q5: How do I know if I need a new Stihl chainsaw guide bar along with the chain?
A5: Inspect your guide bar for wear. Look for a groove that appears wider than the drive links of your chain, uneven wear on the rails, or burrs on the edges. If the bar is visibly damaged or worn, it’s best to replace it along with the chain to ensure optimal performance and safety. A worn bar can also cause a new chain to wear out prematurely.
By following this guide, you’ll be well-equipped to confidently change your Stihl chainsaw chain, ensuring your equipment remains in top condition for all your cutting needs. Remember that proper maintenance and Stihl chainsaw safety are paramount.