Model 2254 deck belt jumped loose, need diagram as to how it winds "top view"

https://www.partstree.com/parts/cub-cadet/mowers-zero-turn-lawn-mower/m60-kh-53ab5bdx750-cub-cadet-commercial-tank-zero-turn-mower-27-hp-kohler/fabricated-deck-spindle-assembly/


Likely the deck idler pulley is loose or bearings are shot. The pulley should not wobble and the flat side of the belt should ride square against the pulley face (the pulley should be reasonably perpendicular to the deck). If not, the idler arm pivot is loose or the pivot bolt and arm are shot. Check proper tension is applied by idler pulley torsion spring (the belt is not loose).

Comment here and Ill assist further if need be.

Here's a link to an online John Deere parts store. When you land on the page, look at the top sub categories for the size of deck your mower has. You should be able to access a parts diagram with pictures of your belt's proper placement.
http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt

it's usually on top of the deck clean off the grass and look on top may have to remove it to see

Go to Craftsman, Order Tree or Parts Tree.com and input your model number. Choose the correct tab and go to the mower deck. It will give you a good over view of how the belt routes. Hope this helps.

Thought I posted a solution earlier on this, but it was my first post and I don't see it here so I'll try again.
Google search on your model shows the drive belt diagram on page 27 of the manual.

link below:
http://www.mytractorforum.com/images/reference/dgs6500.pdf

Looks like mine.
basically need to remove front pulley by loosening center bottom bolt while holding the center nut on top of motor.
Slip belt over the rear pulley first and then straight toward the front, slip belt on front pulley and then slide pulley back onto shaft.
Then wind through the rest of the pulleys etc..as seen in the diagram.

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt
Click on the above link then do a "model search"
click on which model (either yellow deck or black deck)
alphabetically pick which belt,
a diagram should appear in the right hand corner.
Or you can try the link below.You will need to sign up(free I think)


http://www.pdfph.com/pdf/john-deere-1999-stx38-hydro-deck-belt-diagram/


The link below has a picture of the belts on a yellow deck.
http://www.askmehelpdesk.com/tools-power-equipment/installing-belt-jd-stx38-hydro-385391.html

Follow this link: http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt then do a "model search"
click on which model (either yellow deck or black deck) alphabetically pick which belt,
a diagram should appear in the right hand corner.

Or this website:
OutdoorPowerInfo.com © 2011
Or just 'google':
Installation of John Deere STX38 and STX46 Hydro Drive Belt (Black Deck)
Good luck.

May I get the make and model # to get you the right belt diagram

The deck drive belt makes an L shape looping to the the outside deck pulley that has 2 pulleys. The deck drive belt rides on the top set. X = pulley engine x
l l
l l
l l -
l l x x = outside deck pulley
back deck pulley =x
motor to idle to outside
motor to tension to outside back side of belt goes around idler

http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt
This link will send you to the illustrated parts list on the john deere site. It shows the belt routing in the part diagram. Hope this solves your headache.