My Petrol Chainsaw chain will not move when I rev the engine

Overview

If your petrol chainsaw engine is running but the chain does not rotate when you apply throttle, the issue is usually caused by an engaged chain brake, incorrect chain tension, or damage to the chain or guide bar.

This guide explains the most common causes and how to safely check and resolve them.

Step-by-Step Guide

Step 1: Check the Chain Brake

The chain brake is the most common reason the chain will not move.

• Pull the chain brake lever backwards towards the front handle to disengage it
• When correctly disengaged, the chain should move freely by hand (wear gloves)
• If the lever is pushed forward, the brake is engaged and will lock the chain

Step 2: Check the Chain Tension

Ensure the chain is correctly tensioned.

• The chain should sit snugly in the guide bar
• You should be able to lift a small section of chain slightly away from the bar
• The drive links must remain seated in the guide groove

If the chain is too tight or too loose, it may prevent proper movement or cause the chain to jam under load.

Step 3: Check the Chain and Guide Bar

Inspect both the chain and guide bar for signs of damage or wear.

Look for:

• Bent or damaged chain links
• Excessive wear on the guide bar
• Debris lodged in the bar groove

If damage is found, replace the affected parts before using the chainsaw again.

Step 4: Understand Chain Tension Changes During Use

Chain tension can change during operation:

• A cold chain may appear slightly loose before use
• As the chain warms up, it will expand and tighten
• Regular tension checks are required during operation

Always adjust tension according to your product manual.

If the Issue Persists

If the chain still does not move after completing all checks, the issue may be caused by internal drive or clutch damage.

Please contact our Technical Support Team for further assistance.

Summary

• Ensure the chain brake is fully disengaged
• Check correct chain tension
• Inspect chain and guide bar for damage or debris
• Recheck tension as the chain warms up

FAQ

Why does my chainsaw rev but the chain doesn’t move?
This is most commonly caused by the chain brake being engaged or the chain being incorrectly tensioned.

Can a loose chain stop it from moving?
Yes. A loose chain can slip off the drive sprocket or fail to engage properly.

What if the chain brake is off but it still doesn’t move?
Check the chain tension and guide bar. If both are fine, there may be an internal clutch or drive issue.

Do I need to stop and check tension while using it?
Yes. Chains expand as they heat up, so tension should be checked regularly during use.