Tim - you will discover that the 600 Series saws while being heavy, somewhat loud, and slightly underpowered for a 60 cc saw are actually quite dependable and have been responsible for putting a lot of firewood in the winter coffers.
WARNING! --- NOT McCULLOCH CONTENT BELOW
My project for the weekend was replacing the engine on my log splitter, the old Briggs & Stratton did still run but the muffler had disintegrated, one of the muffler bolts broke off in the head, and my temporary fix with a pipe & muffler threaded into the exhaust port was not really up to the task. Shame that it has only lasted 26 years...this was a few years ago when I was working up a large maple tree in my own driveway.
I had a 16 HP Duro Max (Chinese clone of a Honda) "left over" from the first snow blower I mounted on my Struck mini dozer so I decided why not? It was necessary to modify the engine mounting plate and position which moved the engine ahead a few inches which also meant I needed to replace the inlet hose and the pressure hose from the pump to the valve. I decided to reinstall the fender on the engine side to try and keep mud, water, road debris, etc. out of the new engine. All ready to go now which is a good thing since I have a couple of projects coming up this week, weather permitting.
I went ahead and replaced the oil filter, topped up the hydraulic oil, and made some repairs to the jack so I should be ready for another few seasons of splitting. I expect I will need to replace the tires at some point, I already replaced the wheel bearings a few years ago and the rest of the hoses have been replaced in the last year or two. It says 28 tons but I tweaked the pressure relief up just a bit...
I found it interesting that the bolt circle on the engine matched the pump mount exactly, all I had to do was cut the shaft length down a bit and replace the element in the coupling, both engines had a 1" diameter shaft so the coupling halves remain the same (Lovejoy 099/100).
Mark