Damn. Wrong again. Thanks for the correction.
A little of both. The NS saws used a counterweight feed system. The 4V saws use an air over hydraulic system. Air pushes the hydraulic fluid through the system, causing the movement. So, I guess you are both right. They generally don't leak, but O-rings are subject to failure but can easily be replaced.
The NS saws came with a 1 hp motor, but was able to put a 3hp on. I am not familiar with the 2 phase myself, so not sure what would all be missing from the electrical system.
The 3 speed models were pretty rare, as most customers bought the 5 or 10 speed models. I do have some drawings available, but when we switched to the 4v series in 1969, there wasn't a lot of forethought into keeping some of them. We do have a fair amount of parts remaining for the NS saws, and many of the parts translated into our 4V series and is still used today. Shoot me an email at
[email protected] with any specific questions, and I can try to help you out the best I can.