Mtd tractor model13ap925p004 I need a diagram of the deck. I have a part broken.

SOURCE: removing tractor deck to change belt and blades?

if i am thinking of the right model you may be able to get away with first taking off the blade, then to remove the deck should be a number of bolts under the chassis and on top of the deck where it meets the frame... you can get your parts here if your having trouble finding them
 http://www.ordertree.com/modelinfo/MTD/13A1674G401-%281997%29/62.13A1674G401-%281997%29.1.1.1.html

SOURCE: Diagram for Lawn tractor instalation belt

managemyhome.com has many manuals for yard machines/mtg lawn tractors.
The information you need may be generic and therefore almost any manual may help re-install the belt. This manual is for the 660-679 series. Once at the site you can check different model numbers for one that may be closer to the machine you have.

http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0403122.pdf


Good luck,
Techjoel

SOURCE: MTD Lawn Tractor: Constantly shredding deck belt...

I have the exact same model MTD tractor with same problem. It began when the bolt that extends through the idler arm assembly broke and subsequently damaged the pulley. Upon examination of the broken bolt, I found that the threaded end that extends below the deck is significantly smaller that the rest of the bolt. I got a larger bolt with the same size threads, bored out the hole through the deck and it made the whole idler assembly much stronger. the deck still has some vibration and some unusual belt harmonics, but it appears to be working. Compared to most other tractors of this size, this deck is very complicated.

SOURCE: yard man mtd 20hp 46

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

SOURCE: diagram on how to replace belt on deck 48

This is an older model, but the routing might be similar.