What size belt do I need and where can I find a diagram to replace it?

You will need the model number to find this info. Usually on a plate or sticker under the seat. The use a parts site like jackssmallengines.com or simply Google your make and model followed by "deck belt"

Lisa, You could try to Google search your make and model# manual.
Check the attached links manual,instruction and guides, Good luck
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46 Deck Belt Pulley Routing Riding Mower
Replace Your Lawn Tractor Deck Belt
MTD YARD MACHINES 46 CUT RIDING MOWER DECK BELT INSTALLATION REPLACEMENT
Yard Man 604 Operator Manual

With the model no. on the motor wont get your belt,you have to have the model no. off of the mower itself,and if all else fails you can take a piece of rope and have someone help you and go around all the pullys till it meets up with the beginning and cut it then measure the rope and that ought to get you real close! good luck,but the model no. on mower should get your belt.

You can find the belt diagram for the MTD Yard Machine mower in the MTD Owner Manual. The diagram is on page 21.

MTD says there are 2 different applications. I hope this one is yours, if not, by using it as a reference; maybe you will be able to do yours. Good luck.

http://support.mtdproducts.com/app/answers/detail/a_id/7/~/how-is-the-46%22-cutting-deck-belt-routed%3F

need main drive belt numbers for 132-520c6701L212G60073 10.5 horse power

Ok first of all is not an automatic.Its a pedal operated transmission. The motion is accomplished by tightening a belt with a moveable idler and it is only shifted with a lever to forward and reverse. The belt probabley has a burnt spot in it and it hits that spot and it feels like a surge. Replace the motion belt
Mike

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.

go to the online web site for the yardman this will give you the guide on how to replace the belt.

bex bissell proheat