540 clutch drum

[undee70ss]

Here's one that I recently picked up. I already have one with a wrap handle so I guess I needed one with the standard handle. Good CR, needs carb cleaned and maybe a boot, but also has a broken clutch drum. Unusual place for one to break. Already picked up a new clutch drum ( still looking for the bearing). The big question is why it broke. What other parts should be looked at and maybe replaced?

[sweepleader]

Pretty hard to see, did the spline get cut by the drive links? Looks like there is way too much wear on the rim, can the drive links touch the spline? What is actually broken?

[onlyhomelites]

That's a nice looking saw Greg! If I'm looking at it correctly, the oil pump activator is what broke off? The sprocket rim is really worn, did the drive links of the chain weaken the metal for the activator tab(s)? I could see one breaking if was already weak and then the chain brake engaged at full cutting speed.