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What comes to mind is that the belts are being overly stressed on the new equipment. I can't imagine going through so many belts per season. Are the belts breaking or stretching? What are you mowing, High grass, weeds, and at what engine speed ? How low is the mower deck set? What tractor speed is used. Does the top of the deck become clogged with excessive amounts of clippings? Does the mower bog down and strain? These are all factors that can shorten the life of a belt.
Ranch King is a brand name of the manufacturer MTD.
Product manuals with part blow-up diagrams are available from MTD's web site, http://www.mtdproducts.com/ Models are identified from the model number printed on a label under the mower seat.
The PTO and deck drive belts are shown on one diagram and the transmission drive belt is shown on another. The Form number on my printed Operator's Manual is 770-10526A (22HP, 46in cut) for Hydrostatic 817/818 models.
Parts can be ordered directly from MTD or other distributors on the web.
It is my experience that original brand name MTD belts work best.
The 22HP, 46" mower deck Ranch King Pro has 3 belts:
The drive belt which runs from the engine pulley back to the hydro drive unit to provide over-the-ground propulsion is part #754-0349.
A mower has either an electric PTO or a manual PTO, not both.
The electric PTO belt the provides power to the blade deck (runs around the electric clutch on the engine shaft (activated by electric switch, not the mechanical hand lever that engages the mower deck) is p/n 754-0476 for the 46" deck.
The manual PTO belt the provides power to the blade deck (runs off the pulley on the engine shaft (activated the mechanical hand lever to the left of the steering wheel that engages the mower deck) is p/n 754-0228 for the 46" deck.
The deck belt that goes around the 3 blade spindle assemblies on the mower deck, to drive the grass cutting blades is p/n 754-0349
In my experience, the PTO belt lasts about half a season, the other belts break about every other season when mowing 4 acres weekly.
I assume you mean the engine pulley by "front pulley"? Is the belt guide still in place? It bolts to the side of the frame and runs out to the engine pulley to hold the belt on when it's disengaged. Sound like your's may be missing/broken off