Wheel Bearing Question

[Educaid]

I am a total beginner but thought, what the heck, I only paid $2,000 for the car so why not take a shot at it. I wanted to replace all of the rotors and pads, brake lines and see if the bearings needed attention. The car is a 1989 260E with 102,000 miles.

I started with the left front. First problem, which bolt do I remove. I thought I located the right one and making sure that it was going the right way, tried to loosen it. No go. Had to hit the wrench with a large hammer. It finally broke free. The extremely dirty pads almost fell out once I swung up the capliper housing. I decided to take the other bolt off as well to see what was next. Two large bolts held on the rest of the caliper. Went out and bought a 19mm socket and breaker bar. I had to jump up and down on the bolts but with a crack they both came out.

Next, the allen screw holding the rotor was stuck. New ones look like they have blue loctite on them. Went out and bought a 5mm 3/8 inch allen socket. Thought I might strip it, but by pushing in while pounding the socket wrench with fist broke it fee. Luckily with a few hits of the hammer the rotor came off.

Next, tried to remove the bearing cap. It is marked with a white line and a red dot. There is a white material around it, perhaps to seal it. Took a large screw driver and tried to twist it, but it was too tight. Next, tried to get leverage against the hub. Watch out. The metal on the hub can break off. Tried pounding it at an angle with the screw driver. The movement was almost unnoticeable however, little by little it came loose.

I scooped out the green grease with a finger. What I found is attached in the picture. There is a "nut" with what looks like an allen fitting marked with red. The three pronged flat propeller thing sits behind it. This spins freely.

Since it looks pretty good I might just put new grease in it and put the cap back on. Is there any significance to the fact that I turned the "propeller thing around. I don't think so but who knows? Is the red dot on the cap supposed to be oriented in some way? I read somewhere that it is but I cannot remember why. Should I put some teflon tape on the hub to seal the cap. I can see why they are sealed -- you don't what anything getting in there.

Lastly, assume that I want to take the bearings out, what is next? Loosen the allen screw? Does that allow the nut thing to twist off? What do you do with that radio thing? How do you get it off? How are the bearings adjusted. I researched this but no one ever talked about an allen screw, etc.

Thanks for your help.