I always recommend taking up warranty for necessary repairs, but I don't recommend just taking it to the dealer, asking him to fix it, and then arguing warranty. I suggest you describe the problem to the dealer, and tell him that you regard it as a warranty issue. Ask him to just look at the machine in the first instance then phone you with his report. If he disputes that it is warrantable but you believe it is, you can take the dispute to Greenfield if necessary while the evidence still exists.
I do not believe any reasonable dealer or manufacturer can claim that if the idlers wore out and became unusable, in 111 hours with proper servicing along the way, that constitutes fair wear and tear.