SOURCE: mtd yard bug model - 198707 riding lawn mower blade belt size?
I dont know the belt size but if you go to mtd belts in Jackssmallengines.com you should find it. Stephen.
SOURCE: MTD riding mower does not move forward or reverse.
this is a belt driven transmission. from the engine driven pulley going aft towards the xmission differential there is another smaller variable speed pulley, there is a long belt between these two, from the variable speed pulley there is a larger xmission pulley that sits kitty-corner to it with a belt between these two. This larger "xmission pulley" is what drives the differential and depending upon which gear you have selected, makes it go forward or reverse. Check that both belts between pulleys are on, check that pulley's hardware is completely secured (nuts tightened down) The heads of these pulley's are splined to align to the shaft(s) and if they aren't tight, they will just spin and not engage the transmission. If your battery is under the seat, remove it and you should be able to see and access the aft pulleys. If both belts are on and engaging the pulley's and the shaft is turning on the transmission pulley than you have transmission differential failure. Bet it's the belt off or pulley head loose. Good luck, hope this helps
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