Lawnmower will not move in gear with motor running

Question edited to add Maker.

Likely to be a drive belt issue.

7 Reasons Why a Riding Mower Won't Move Forward or ...

https://lawncaregrandpa.com > 7-reasons-why-a-riding-...
Mower drive belts slipping is major reason some riding mowers won't move forward or in reverse. These belts connect the energy produced by the motor to the axle ...

Question edited for full make model (what it is).
Question moved from Cars and Trucks.

Sounds like one side of the gear selector cable is slack.

https://www.google.com/search?q=Craftsman+yard+bug+500%2C+not+moving+forward

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Reverse is a different gear set than forward gears. Sounds like forward gear set has a broken tooth. Not an easy fix.

check pin in side hub of wheel . if it fell out or broke it freezes movement.

Hello
Check on the mower that your drive belt has not come off or has not broken
Thanks

Is the brake sticking. On my craftsman mower there is a bar under the brake pedal that pushes back a lever when starting. And the lever sticks. I have to reach underneath and pull the lever forward and then the mower goes. I haven't found a solution to that yet.

hello otto i would check the belt that runs to the rearend but the brakes could be also froze up i would try to jack it up & see if it will move then go from there

you might check the pulleys to see if shear pin has broken.

i have a crafsman mower and it only cranks it wont start wat would be wrong

a hydro uses a foot pedal on the right side , you push forward to go forward or rock the pedal rearward to go in reverse - a regular transmission has a shifter usually between your legs for reverse 1st 2nd or 3rd gear - you also said the blades wont engage . are they electric ( with a switch ) or do you manually move a lever .