Compatible with Echo CS590, CS600, CS620 Chainsaw 2-Piece Sprocket Replacement A556001610 – Clutch Drum Spur Sprocket Assembly

Fit the CS-590 with no issues. Install is easy just just find the part on you tube and follow along, takes just a few minutes to do.

fit perfect on echo cs590

I haven't used it yet but the kit came with ring sprocket and needle bearing and the drum looks thick enough. My CS590 came with normal clutch drum so this is an upgrade. A spur sprocket lets the chain stay on a harder wheel and move a couple mm to deal with bar flex or chain flex. Instead of wearing a couple notches in a normal sprocket leading to bar wear or chain jumps, this makes tensioning more even.

For my Echo 590 it's working well. A little harder to install a new chain on it, but better than oem.

I first order this wondering if it would be compatible because it looked so different. But it operates better with this set than the original. No slack when it's cutting.

Fit like it should.

I am using this kit in A echo 590 I ran it with A 20 '' Standard cross cut chain Ground @ 18 Degrees. Then A 30'' Ripping chain With staggered teeth . in oak and then used the 30 '' ripper to cut planks out of some beautiful 3 color pepper I saved from a job .even the 30 '' chain cut smooth as silk with this hub without jerking or binding. after 6 hours of heavy use there was no shiny metal wear marks or mushroomed drive links . This style hub drives the chain with a lot of surface contact so it doesn't ruin the clutch or the drive links .definitely will order more

Sprocket rims come in 17mm 19 mm 22mm (at least) inner hole. Seller does not offer additional rims, not in product description nor packaging. Seller does not respond to Amazon questions nor return phone calls (never answered phone - had to leave message). I disassembled from my Echo cs590, measured and ordered fromanother seller and 22mm 3/8 7T for many models of Husqvarna work.