Husqvarna Outdoor Power Equipment Chainsaw Chain Keeps Coming Off: How to Fix It Yourself
A chain that keeps coming off is usually too loose, mounted on a worn bar, or is the wrong size for the bar. This is a common issue that is almost always easy to fix. It is also important to fix it promptly — a chain that comes off during cutting is very dangerous.
⚠️ Safety First
- Always wear cut-resistant gloves when handling a chainsaw chain.
- Make sure the engine is off and the spark plug wire is disconnected before adjusting the chain.
- A loose chain that comes off during cutting can cause serious injury — fix this before using the saw.
- Never over-tighten the chain — it should pull slightly away from the bar but snap back.
Parts You May Need
Step-by-Step Repair
- 1
Check chain tension
With the engine off and the chain brake engaged, pull the chain along the top of the bar. It should pull away from the bar about 1/8 inch (you should see daylight between the chain and bar) but snap back when released. If it sags visibly or hangs away from the bottom of the bar, it is too loose. Chains stretch during use and need regular re-tensioning.
- 2
Tighten the chain properly
Loosen the two bar nuts on the side cover (do not remove them). Find the tensioning screw — on Husqvarna saws it is usually between the two bar nuts or on the side near the bar. Turn it clockwise to tighten the chain. While holding the nose of the bar up with one hand, tighten the bar nuts firmly with the other. Lifting the bar nose ensures the chain seats properly in the bar groove.
- 3
Inspect the bar groove
Remove the side cover and chain. Look at the groove (rail) that runs around the edge of the bar. It should be even in depth all the way around. If it is worn wider in spots, pinched closed, or has burrs, the chain cannot ride properly and will keep jumping off. Use a flat file to clean up small burrs on the bar rails. A severely worn bar needs to be replaced.
- 4
Check the drive sprocket
The drive sprocket (the toothed wheel behind the clutch) wears down over time and can become too worn to hold the chain properly. With the side cover off, look at the sprocket teeth. If they are visibly hooked, sharp on one side, or worn down, the sprocket needs replacement. A general rule: replace the sprocket every two chains.
- 5
Verify the chain matches the bar
The chain must match the bar in three measurements: pitch (distance between drive links), gauge (thickness of the drive links), and number of drive links. These numbers are stamped on the bar and printed on the chain packaging. An incorrect chain will never stay on reliably. If you are unsure, bring the bar and old chain to a dealer and they will match it for you.
If That Didn't Work
- Bar nose sprocket seized (not spinning freely)
- Damaged or missing chain tensioner pin
- Chain installed backward (cutting teeth face the wrong direction)
- Side cover not tightened properly after chain change
When to Call a Professional
If the drive sprocket needs replacement and you are not comfortable removing the clutch, or if the bar and chain are both worn and you want help selecting the right replacements, a Husqvarna dealer can set you up quickly. Most chain and bar replacements are done while you wait.
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Disclaimer: This guide is for informational and educational purposes only and does not constitute professional repair advice. All repairs are performed at your own risk. RepairItFree.com is not liable for any personal injury, property damage, device damage, voided warranties, or other losses resulting from the use of this information.
If you are unsure about any step — especially anything involving electricity, gas, water, or refrigerant — stop and consult a qualified professional. Your safety is more important than saving money.
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