Can't find model number

Question edited for clarity.

Support ' Manuals - Murray

https://www.murray.com > en_us > support > manuals
Looking for support of your Murray mower or garden tools? ... search window below to locate Operator's Manuals, Illustrated Parts Lists and Wiring Diagrams.
Missing: 40371x50a ‎' Must include: 40371x50a

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  Manuals - Service & Support - Murray

  https://www.murray.com > en_mx > support > manuals
  Model numbers on Murray riding lawn mowers are found on the back of the mower ... to locate Operator's Manuals, Illustrated Parts Lists and Wiring Diagrams.

Inspirational Murray Riding Lawn Mower Wiring Diagram

https://www.pinterest.com > ... > Subjects > Science
Murray Tractor Ignition Switch Wiring Diagram. Riding Lawn Mower Electrical Diagram. Craftsman Riding Lawn Mower Parts Diagram - Amazing Wiring Diagram.
Missing: 40371x50a ‎' Must include: 40371x50a

425017x78B, Lawn Tractor Parklands Sentinel (2008) Parts ...

https://www.jackssmallengines.com > electrical-system
Murray 7800302 - 425017x78B, Lawn Tractor Parklands Sentinel (2008) Electrical System Exploded View parts lookup by model. Complete exploded views of all ...
Missing: 40371x50a ‎' Must include: 40371x50a

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  Lawn Tractor (2004) Parts Diagram for Electrical System

  https://www.jackssmallengines.com > riders > 42-cut > e...
  Murray 425001x8B - Lawn Tractor (2004) Electrical System Exploded View parts lookup by model. Complete exploded views of all the major manufacturers.
  
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This page has some dimensions of belts.

https://www.discountonlineparts.com/lawnmower/?c=Deck%20Belts&b=Murray%20/%20Noma

https://homeguides.sfgate.com/instructions-install-murray-lawn-tractor-belts-101252.html

There are several YouTube videos about replacing belts on a Murray.

Pulley, Jackshaft
Part Number: 091769MA


Murray 38633x92A 1996 38 Inch Lawn Tractor Parts

Murray 38500A 1997 38 Inch Cut Lawn Tractor Parts

or find your tractor here,,,
Search eReplacementParts com

my specialty,but,you didnt post what the problem is,so,here goes,if it wont start,it is probably a bad safety switch,take the small black wire off of the coil,if it starts,then its a safety switch,if it doesnt then it is the coil,if it only clicks with a charged battery,it is the solenoid,turn on your key and short between the two big bolts on it if it starts it is bad,if you need a belt,i will need the numbers under the seat,otherwise i will try to find them for you,i will post a user manual for you here, Murray 425607x52A 42 34 Lawn Tractor Parts
Murray 425016x48A 42 34 Lawn Tractor Parts
Murray 425306x48A 42 34 Lawn Tractor Parts
Murray 425600x48A 42 34 Lawn Tractor Parts
Murray 425618x48A 42 34 Lawn Tractor Parts
Murray 42560x52A 2000 42 34 Lawn Tractor Parts
Murray 42820x24A 1996 42 Inch Cut Lawn Tractor Parts
Murray 425619x24A 42 34 Lawn Tractor Parts
a few manuals,find yours here or go here to find it by the numbers under the seat,all part numbers are in them, Search eReplacementParts com

try this

According to Murray, maybe it is found on a plate under the seat.

http://murray.myfaqcenter.com/Answer/?p_faqid=3534&selectCats=Riding%20Mower

http://www.ereplacementparts.com/ type in model number of your mower ie 40560x50c All parts and diags ypu need ,Yours Henry

probally trash in the carb or fuel filter partially clogged. try replacing the fuel filter if no go the carb will need disassembled and cleaned.

Hey...my name is Keith...im not sure which belt you are asking for...but the drive belt is a 37X61 and the deck belt is a 37X62..i hope this helps

Your drive belt is worn/slipping