I just replied to your other thread over on GTT, but will copy it here for completeness:
The below is the only information in the TM1591 about the fan belt.
My understanding is that you need to take the drive shaft coupling off the engine to get a new belt over that pulley, and taking the radiator out first gives much better access to that area.
I have never had to change/replace a fan belt -- maybe another member here can give more detail for you. A forum member over on WFM has this to say back in 2009:
It’s not a simple job, but allow yourself 3 hours. I suppose it could be done quicker, if you are in a hurry or it’s not your first time. Here’s my procedure:
1. Remove the side panels around engine.
2. Remove the air box from the top of the engine.
3. I removed the alternator next, seemed it would be easier to get to some of the other bolts that have to be removed later.
4. Drain the radiator. Now here’s a little hint. The petcock is on the alternator side of the radiator. There also is a little drain tube in the radiator and a hole punched in the sheet metal below it, so that you can get a small hose on it to drain directly into your drain pan.
5. Remove the 3 bolts on either side of the radiator. Remove both radiator hoses. You have to do this or the shroud will not come off of the radiator and you can’t remove the radiator without removing the shroud.
6. Remove the 4 bolts holding shroud to radiator. (these are fun to get to)
7. Wiggle the shroud over the fan. I say it that way because the shroud hole for the fan is not round; there is a flat piece along the bottom (to restrict airflow?) that makes it a little difficult.
8. The radiator can be pulled straight up and out at this point. Make sure to clean the fins while it’s out!
9. Remove shroud from around fan.
10. Remove the four bolts holding the fan to the water pump. Remove fan and pulley, don’t lose the pulley spacer!
11. Now the part you did all that to get to, remove the 6 bolts (red arrows) from the crankshaft isolator (green arrow pointing to), it’s that big rubber mount keeping you from putting your new belt on the crankshaft pulley.
12. Put on your new belt.
Put it back together.
1. Put crankshaft isolator back in.
2. Put fan and water pump pulley back on. Don’t forget the pulley spacer, or your belt will squeal.
3. Put the shroud back around the fan.
4. Slide the radiator back in, make sure it locates in the pin holes in the frame.
5. Install shroud on radiator.
6. Install air box bracket on top of radiator. Do this before putting upper radiator hose on.
7. Re-install six bolts in side of radiator / bracket.
8. Install both radiator hoses.
9. Retighten drain petcock. Fill radiator.
10. Install alternator.
11. Tighten new belt.
12. Re-install side covers. Install air box.