Murray 42" tractor drive won't engage

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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Try the parts diagram, item 52 disconnect rod.

https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/murray/2002-models/lawn-garden/riders/lawn-tractors/42-cut/425613x8a-lawn-tractor-2002/drive-assembly

mower shop or belt retailer

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Murray 38711x42A 2000 38 34 Lawn Tractor Parts

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Murray 425607x52A 42 34 Lawn Tractor Parts

46
Murray 46379A 1996 46 Inch Cut Lawn Tractor Parts

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

http://www.ereplacementparts.com/ type in your model number all the diags you need, yours Henry

sounds like you sheared a woodruff key check the key on the pulley. Or maybe your belt is no good or came off the tension pulley anyway that might get you in the right direction.

Get the model number off the tractor, go to:

www.murray.com

enter the model number and you will find a manual with pictures of how to route the belts along with a lot of other good information

You can go to www.murray.com , enter your model number and download an owners manual which will have the instructions and diagram on how to do it

Your drive belt is worn/slipping