When I bought my Echo 4600 used I had the problem of no oiling. I tore the saw apart and found the problem immediately, no worm gear at all! I guess that saved me the problem of pulling the gear, bought a new metal one from dealer and cleaned everything up and it's now ready to go..
I had to heat the gear slightly to get it on the crank so I would imagine if they're a press fit that a little heat would be valuable in getting it off.
I had to heat the gear slightly to get it on the crank so I would imagine if they're a press fit that a little heat would be valuable in getting it off.