I have the same saw. Mine uses 1/2" x 60" x 0.025" blades with 14 tpi. I paid $69 for it about 20 years ago from a company surplus sale. I bought new tires and plastic drive gear from Sears shortly thereafter. I never installed the gear, not sure I could find it at this point. I have a love-hate relationship with the saw. I hate when the blade jumps off the wheels. That happens mainly with 6061-T6 aluminum due to metal pickup on the blade. A stick of cutting wax has helped solve that problem. One of these days I'll junk it and get a Horrible Freight or similar 4x6. Back in the good ol' days, the US could make cheezy machines as well as the Asians can now.
I run the blade about as tight as I can get it. The spring under the adjustment knob is fully compressed. I make sure I lightly snug the non-driven wheel clamping nut while tensioning the blade, then tighten it fully. This prevents tilt of the wheel, which could cause the blade to run off. I run the guide rollers in contact with the blade, with practically no clearance. Occasionally a pile of swarf jams between the blade and a roller, which makes the blade jump off. I don't think I could make a straight cut without the rollers contacting the blade. As it is, the cuts are reasonably straight, all things considered.
I've gotten fireworks from the motor when swarf falls into it. It is well positioned to receive a swarf shower.
My saw is on a decent set of legs with wheels. I think it was OEM, but I'm not positive.
The hydraulic downfeed snubber is about the nicest feature on the machine, but the regulating valve is rather all-or-nothing.