Just rebuilt he undercarriage on a 977 awhile back that had the same problem. That said, you should be able to weld up the crack without any problems. If the crack is running with the joint that holds the rim on, simply grind it out as much as possible and reweld. If there are any other cracks radiating from it and across the side faces of the idler then drill a hole at the end of them, V them out, and weld. For no more welding than than your going to be doing you won't have anything to worry about with pressure building up inside the idler, etc like would happen when laying on the HUGE, multiple, weld beads with a machine torch when rebuilding one.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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