Overview
A replacement chain engineered to match the original specifications of Ryobi RY3818 / RY40580 / RY40508 chainsaws. Sold as a 2-pack, giving you a ready spare. Fresh chains cut cleaner, reduce vibration, and put less stress on the saw’s drive system.
Key specifications
- Bar length: 18”
- Quantity: 2 chains per pack
Compatibility
Manufactured to fit Ryobi RY3818 / RY40580 / RY40508 without modification. Cross-reference your saw’s model number with the product listing to confirm compatibility.
Installation notes
Begin by shutting off the saw and disconnecting the power source. Loosen the bar-mounting fasteners and remove the side cover to access the chain. Slide the worn chain off, seat the replacement around the sprocket and into the bar groove with cutters pointing in the direction of rotation. Tighten the tensioning screw until there is slight play but no droop, then secure the cover.
Common questions
Q: Will this 2-pack 18-inch chain fit my Ryobi RY40580, or do I need to match anything besides the bar length?
Yes, this chain is made to fit the Ryobi RY40580 and also the RY3818 and RY40508 with an 18-inch bar. It’s still a good idea to confirm your saw uses the original 18-inch setup and compare the chain specs from your current chain or owner’s manual before installing.
Q: I have a Ryobi RY3818 and my old chain keeps loosening. If I install one of these new 18-inch chains, is there anything special I should do?
When installing a new chain on the RY3818, make sure the cutters are facing the correct direction on the top of the bar and set the tension so the chain is snug but still pulls around by hand. After a few minutes of cutting, recheck the tension, because new chains commonly stretch slightly during initial use.
Q: Are these chains suitable for normal trimming and firewood cutting on the Ryobi RY40508, and how should I maintain them?
Yes, these 18-inch chains are a practical replacement for routine cutting tasks on the Ryobi RY40508, including limb trimming and cutting small to medium firewood. Keep the chain properly sharpened, maintain correct tension, and always make sure the bar oil reservoir is filled so the chain and bar stay lubricated during use.
