Overview
Packaged as a set of 2, this chain is a direct replacement for Greenworks GCS80420 models. Replacing a stretched or damaged chain restores both cutting speed and operator safety.
Key specifications
- Bar length: 18”
- Quantity: 2 chains per pack
Compatibility
This replacement chain works with Greenworks GCS80420. Double-check your model number against the listing to ensure a correct match before installation.
Installation notes
Disconnect the spark plug wire or remove the battery before changing a chainsaw chain. Remove the bar cover, release bar tension, and take off the old chain. Place the new chain into the bar groove with the cutting teeth facing forward on top. Reinstall the cover, adjust chain tension until snug, and test by pulling the chain around the bar by hand. Re-check tension after a few minutes of use.
Common questions
Q: Will this 2-pack 18 inch replacement chain fit my Greenworks GCS80420, or do I need to match anything besides the bar length?
Yes, this chain is intended for the Greenworks GCS80420 with an 18-inch bar, so it is the correct fit for that model. It’s still a good idea to confirm your current chain specs on the bar or owner’s manual so the pitch, gauge, and drive link count match your saw exactly.
Q: I have a Greenworks GCS80420 and my current chain keeps loosening after a few cuts. If I install one of these new 18 inch chains, what should I check?
A new chain will usually stretch slightly during its first few uses, so recheck the tension after the first several cuts. Make sure the chain is seated properly in the bar groove, the tensioner is adjusted so the chain snaps back against the bar, and the bar nuts are fully tightened after adjustment.
Q: Does this 2PC 18 inch replacement chain need any special maintenance on the Greenworks GCS80420?
Keep the chain properly tensioned, make sure the bar groove stays clean, and verify the saw’s oiling system is feeding oil to the chain during use. For best cutting performance, touch up the cutters regularly with the correct file size and replace the chain if the teeth are badly damaged or unevenly worn.
