The T has a water pump. It's gear driven, and sits under the generator.
The engine is a Hercules. I believe it's a JXB, but I have to look it up all the time as I just can't seem to remember... Diamond T was basically a top of the line make. While that has made it extremely durable, and reliable over the years, some of the systems are hard to find parts or references to as a result.
The fan is the tension adjustment for the generator drive belt. You slide it vertically in that yoke to tighten it up. How, I don't know, but I guess I'll get to figure that out.
Got after the brakes this morning... Several years ago, I pulled all the wheel cylinders, and sent them out to be bored, and lined with stainless to avoid the issue of the cast iron pitting. The cylinders on the rear were NLA at the time (they are now being produced again) and after chasing down 1 of them from Israeli military surplus (they used these on some half tracks that ended up over there) I decided to do that, and be done. I'm loosing fluid, and it isn't coming from the wheel cylinders... So either the master, which is pretty old, or possibly the hydrovac. I'm starting with the master cylinder as that's pretty easy. Plan was to pull it, and send it off for the same treatment, but once I got it out, and clean, I could see the part number, and amazingly, it's readily available new at Napa, so I'll pick that up Friday. I hope to avoid pulling the hydrovac. If I have to I will, and the shop that did the wheel cylinders does them too, but I shudder to imagine the price...



After that, I headed up front again. I thought I'd clean up some of the caked on oil and grease. Nothing extreme, just a little time with a putty knife, and screwdriver. Enough to see what a mess it really was.
Following that, I really cleaned the cross member where the radiator sits. Thought I should put some paint on there, and let it cure hard before I sit the radiator back on there (rubber in between). Hopefully that will be the last time that has to come out in my life... I'll drop off the radiator next week, and I expect it to take them a little while to deal with it. I had some SW Fire Hydrant Red DTM paint. Color isn't quite right, but nobody will ever see it, and it's excellent paint. It'll get a second layer tomorrow.
Finally, I want to replace the fan belt. We keep really detailed records on the T. I went through them all, twice. There is no mention of the belt ever having been replaced. We bought it in 1970. There is a Gates number on it. I just haven't been able to find a reference to that particular belt. Measuring it, it's a C section. The length is buried in my phone which is currently dead... Nothing readily available, but not a problem to get off the net.