Overview
This aftermarket 20-inch replacement chain is designed to fit select Echo chainsaw models. Chains wear out through normal use — cutters dull, drive links thin, and the chain stretches beyond what the tensioner can compensate. This replacement matches factory specifications so you can swap it in and keep working without a trip to the service shop.
Key specifications
- Bar length: 20”
- Type: Semi-chisel (aftermarket replacement)
Compatibility
This chain is designed as a direct replacement for select Echo chainsaws. Double-check the pitch, gauge, and drive-link count on your existing bar stamp before purchasing. These three measurements must all match for safe operation.
Installation notes
Kill the engine or remove the battery and let the saw cool. Loosen the bar cover and push the bar in to release chain tension. Remove the worn chain from the bar groove and sprocket. Fit the new chain into the groove, wrap it around the nose sprocket, and engage it on the drive sprocket. Pull the bar outward to tension, tighten the cover nuts, and dial in the tensioning screw until the chain sits snug against the bar rail with about 1/8-inch of pull.
Common questions
Q: Will this 70-link 20 in. chain fit my Echo CS-590-20AA, or is it only for the CS-590-20?
Yes, this chain is made to fit the Echo CS-590-20AA as well as the CS-590-20, CS-680-20, CS-620P-20, and CS-620PW when they are using a 20-inch bar. The key match points are the 20-inch bar setup and the 70 drive-link chain size, so it’s important to confirm your saw is running that exact bar length.
Q: I have an Echo CS-620PW with a 20 in. bar—how do I know if this chain is the right length before I install it?
Check the markings on your current bar and compare the existing chain’s drive link count to this one, which is 70 links. If your CS-620PW is equipped with the stock 20-inch setup listed for this chain, it should install correctly, but counting the old chain links is the best way to verify before mounting it.
Q: After installing this 20 in. 70-link chain on my Echo CS-680-20, how tight should I set it and what maintenance does it need?
Set the chain so it sits snug against the bar but can still be pulled around by hand with gloves; the drive links should stay engaged in the bar groove. Recheck tension after the first few cuts since a new chain can stretch slightly, and keep it properly oiled and sharpened to reduce wear on both the chain and bar.
