1850 Drive Chain Question

I noticed today that the cottar pins on the master link are sloppy and the rollers are worn. I keep a new chain on hand so I thought I'd best put it on. The question is what is the simplest way to do it on the 1850? I've replaced the drive chain on the 1655 and the 2-70 several times and the easiest access is from below. When I crawled underneath the 1850 there are things in the way. From the top the visibility is good, but there are some oil lines in the way. Looks like something has to be removed either way, which one is the simplest, top or bottom?
 
What's in the way from the bottom? I've had mine off and on my 1850 diesel several times from the bottom.
 
From underneath, there's a hub that protrudes from the front of the transmission housing. It sticks out about four inches, the speedometer cable attaches to the side, and there's a pipe plumbed into the top. It blocks off a lot of the view from underneath, not to mention having to reach around the speedometer cable, unless I unhook it. This is the first time I've had to change the chain on the 1850 and I'm surprised how much more crowded the view is compared to the 1655 and 2-70 (just put a new chain on that one last week.)They don't have that hub sticking out in the way. The annoying thing is from the top everything is in plain view, it's right there, I can see it perfectly, but there are oil lines interfering with hand working space. It is what it is, I'll just do a lotta cussin'.
 
It's a real pain the pins just barely have enough room to come out, and it's hard to hold the pins still while pulling the cotter pins. I put some tiny hair pins back in mine makes it a lot easier.
 
John, what is your opinion of the master links with one side plate and a locking clip? Some years back I installed one of those on my 1655, I think it came with the chain from the local dealer at the time, and it (or one like it, that tractor was worked on at a dealership a couple times)is still on the tractor. It was by far the easiest master link to install, and it has held up well. I'd love to find a source for those links. The parts books show the three cottar pin type, and that seems to be what Agco sells. Maybe that clip style was a local dealership substitution. They're gone now so I can't ask them.
 
You might have the "long shaft" pinion, which allows for future addition of MFWD without having to disassemble the transmission.
 

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