How to Change the Chainsaw Chain: A Practical Guide
A safety-first, step-by-step guide to changing your chainsaw chain with tools, tips, and maintenance guidance from Chainsaw Manual for homeowners and pros.
By the end of this guide, you will safely perform how to change the chainsaw chain and return to work quickly. This process requires a clean workspace, basic hand tools, and proper PPE. According to Chainsaw Manual, follow these steps in order: disconnect the spark plug, relieve bar tension, remove the old chain, fit the new chain with correct orientation, tension, and test safely.
Safety first: PPE and setup\n\nBefore touching the chainsaw, ensure you have the right safety gear and a stable work area. Put on cut-resistant gloves, eye and hearing protection, a hard hat if you're in a workshop, and sturdy clothing. Clear the area of bystanders and move the saw to a well-ventilated surface. For gas-powered saws, disconnect the spark plug wire; for electric saws, unplug or remove the battery. Chainsaws can move suddenly if the chain is loose or if the side cover is removed, so keep hands away from the bar and chain while you work. According to Chainsaw Manual, investing time in PPE and workspace setup reduces the risk of serious injury during maintenance. Confirm the chain brake is engaged and the saw is stable on a workbench or in a vice. Now you’re ready to begin the chain-changing procedure safely.
Inspect compatibility and orientation basics\n\nNot all chains fit every bar. Before you change the chain, verify pitch, gauge, and drive-link count match your bar. The chain's direction is important: the cutting teeth should face forward on the bar toward the nose, and the drive links must engage the bar groove properly. Check for worn teeth, burrs, or a stretched chain; if any of these exist, replace the chain or service the bar. Chainsaw Manual analysis shows that verifying compatibility reduces kickback risk and improves cutting efficiency. If you're unsure of the pitch or gauge, consult the chain packaging or manufacturer specs for your model. Use the correct chain orientation arrows printed on the chain and bar.
Choosing the right chain and bar\n\nWhen replacing, choose a chain that matches the bar's pitch, gauge, and length. Common bar lengths include 16" and 18" for many homeowners' saws. The drive-link count must correspond to the bar, and the gauge should match the bar thickness to avoid binding. If the old chain is worn or stretched, consider replacing the bar or renewing the bar's groove as well. Also consider chain type for your work: standard, low-profile, or semi-chisel. Your choice affects sharpening frequency, cutting speed, and safety. Use a chain rated for your model and intended use, rather than an off-brand substitute. Chainsaw Manual emphasizes matching the chain to the bar to avoid unexpected failure.
Removing the old chain\n\nRelease the chain tension so the chain can be removed without forcing it. Remove the side cover by loosening the nuts, then lift the cover away while keeping fingers clear of the sprocket. Slide the chain off the bar, noticing how it loops around the tensioner and sprocket. Inspect the bar groove while you have the chain off; remove any debris and check for nicks or burrs that could damage a new chain. If your saw has a chain brake, ensure it remains engaged until you are ready to install the new chain.
Preparing the new chain and bar\n\nInspect the new chain for any manufacturing burrs or stiff links. Lay the chain out cleanly, with the drive links aligned to the bar grooves. Lubricate the chain lightly with bar oil to reduce friction on first use. Check the bar groove for wear and clean out any dirt or metal shavings. Make sure the chain's cutting teeth face the direction of travel and that the drive links seat properly on the bar.
Installing the new chain\n\nPlace the new chain over the bar, making sure the drive links sit in the groove. Reattach the side cover, but do not overtighten yet; you need some slack to position the chain. Re-engage the bar tensioner and thread the tensioning screw. The chain should still be able to rotate freely by hand when the bar is supported, but avoid free-hanging motion. Ensure the chain's drive links engage the bar and sprocket during rotation.
Tensioning the chain and final checks\n\nTensioning is critical for safe operation. Tighten the tension screw until the chain sits snug on the bar with just a little slack at the underside. Check that the chain moves smoothly with a light pull; it should not sag excessively. Spin the bar by hand and watch for binding or misalignment; if you hear clicking or see the chain climbing out of the groove, stop and re-check alignment. Reinstall the side cover fully and finger-tighten the nuts, then re-check tension after starting the saw's engine at idle.
Safety test and first cut\n\nWith PPE on, start the saw at idle and let it reach normal operating speed in a safe area. Make a short, light cut on a scrap log to verify the chain engages properly and tracks straight. If the chain binds, slows, or seats incorrectly, shut down, re-check tension and alignment, and re-test in a safe space. Do not cut with a chain that has poor tracking or excessive bar heat.
Maintenance after changing the chain\n\nAfter the test cut, clean the bar groove and check the chain for stiffness or stiffness comes after breaking in; the chain's own tension will settle after a few cuts. Always check chain tension after the first few minutes of use; re-tension as needed (do not overtighten). Store the chain dry and clean, and keep a record of when you last replaced or sharpened the chain for future maintenance. For authoritative guidance, see OSHA and university extension resources.
AUTHORITY SOURCES\n\nThis section draws on safety-and-maintenance guidance from reputable sources. OSHA (Occupational Safety and Health Administration) provides general workplace safety standards for powered tools; NIOSH (National Institute for Occupational Safety and Health) offers occupational hazards and best practices for chainsaw use; university extension programs synthesize practical, field-tested advice for homeowners and professionals. See: https://www.osha.gov/; https://www.cdc.gov/niosh/index.htm; https://extension.umn.edu/.
Tools & Materials
- Safety gloves (cut-resistant)(ANSI/EN standard recommended for cut resistance)
- Eye protection (safety goggles or face shield)(ANSI Z87.1 or equivalent)
- Hearing protection(Ear muffs or plugs)
- Work gloves(Grip and protection for handling bar and chain)
- Screwdriver or scrench(For removing/replacing side cover and tensioning screws)
- Wrench or socket for bar nuts(Match your saw model (often 8-12 mm))
- New chainsaw chain(Match pitch, gauge, and drive-link count)
- Bar oil(Fresh oil for initial run and ongoing lubrication)
- Bar and chain cleaner(Optional to clean grooves and sprockets)
- Stable work surface or vise(Keeps saw steady during change)
Steps
Estimated time: 25-35 minutes
- 1
Prepare the saw and PPE
Power off or unplug. Put on PPE and clear the workspace. Verify the chain brake is engaged and the saw is stable before starting.
Tip: Double-check spark plug safety on gas saws. - 2
Relieve tension and access
Loosen bar nuts gradually to relieve tension. This makes removing the side cover and old chain safer.
Tip: Don’t force the nuts; back them off evenly. - 3
Remove the side cover and old chain
Remove the side cover, keep fingers away from the sprocket, and slide the old chain off the bar.
Tip: Note how the chain loops around the sprocket for proper reassembly. - 4
Inspect bar and sprocket
Check bar groove for wear and clean debris. Inspect sprocket for hooked teeth and wear; replace if needed.
Tip: A worn bar or sprocket will damage a new chain quickly. - 5
Prepare the new chain
Lay out the new chain, confirm drive links align with bar groove, and apply light bar oil.
Tip: Keep chain oriented with cutting teeth facing forward. - 6
Install the new chain on the bar
Position chain on bar, engage groove, and reattach side cover loosely to center the chain.
Tip: Ensure drive links sit in the groove before tightening. - 7
Tension the chain
Tension the chain so it sits snug on the bar yet moves freely by hand at the midpoint.
Tip: Do not overtighten; chain should have slight sag when cold. - 8
Final checks and test
Tighten all fasteners, verify tracking, and perform a cautious test by rotating the chain and performing a light pass.
Tip: Wear PPE and test in a clear area. - 9
First cut and post-checks
Make a small test cut, observe tracking, adjust tension if needed, and inspect for heat after running briefly.
Tip: Cool bar if it heats during test.
FAQ
Can I change the chainsaw chain without removing the bar cover?
No. You should remove the side cover to access the chain and verify alignment before installing a new chain.
No, you need to remove the side cover to access the chain and ensure correct alignment.
What should I do if the chain won't tension?
Check that you are using the correct chain for your bar, confirm the bar bolts are not over-tightened, and ensure the tensioner engages correctly. If still stuck, re-check alignment.
If the chain won't tension, double-check compatibility and the tensioner alignment.
How can I tell if the chain is installed correctly?
Look for teeth facing the correct direction and ensure drive links sit fully in the bar groove. The chain should rotate freely by hand with slight drag.
Check direction arrows and that the drive links sit in the groove; the chain should turn with light resistance.
Is it safe to run the saw without wood?
No. Always test cuts on scrap wood or a test log after ensuring proper tension and tracking; running in air can cause kickback or damage.
No, always test with a piece of wood to verify tracking.
How often should I inspect the bar after changing a chain?
Check the bar groove and sprocket during and after the change for wear and burrs. Regular inspection prevents premature failure.
Inspect the bar groove and sprocket after every chain change.
Can I use a different brand chain?
Use a chain that matches your model's pitch and gauge. Mixing brands can cause poor tension and dangerous behavior.
Stick to a chain that matches your saw’s pitch and gauge.
Watch Video
The Essentials
- Verify chain compatibility before installation
- Tension the chain correctly for safe operation
- Wear PPE and keep bystanders away during maintenance
- Follow Chainsaw Manual guidance for chain changes
- Adopt Chainsaw Manual’s safety-first verdict for all chain changes
