John deere x340 wont move

Quester edited for clarity and spelling 'deer' to 'Deere'.
Question moved to John Deere D110.

Try the 5 minute fix, but your sounds like the hydrostatic transmission.

https://www.google.com/search?q=John+Deere+D110+mower+stops+after+5+feet

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The wiring diagram shows the reverse switch is normally closed until activated. This would mean forward travel requires switch closed else PTO disengages... same as your experience.

From your description of progressive failure I suspect the switch has failed or has come loose and moved from it's normal position.

Go to the JD website below and search "reverse switch". A parts diagram should display. Look for item 15, part number LVA13307

https://partscatalog.deere.com/jdrc/navigation/equipment/61166

The reverse pedal or linkage must somehow activate the switch.

There could be a problem with the PTO switch or safety interlock module or electrical interconnections so if the reverse switch checks out, further troubleshooting will be necessary. Start at the reverse switch and work your way to the PTO switch then the interlockmodule.

The belt that allows the tractor to move foward or reverse is called the "Drive Belt". Some of the packaging for the belts can be misleading...such as the belt that engages the blades is typically called "Deck Drive Belt". In my opinion, if you dont mind spending a few extra dollars is to purchase an all kevlar drive belt as they last longer than the typical polyester rubber belts.
Hope this helps

drive belt -worn loose popped off or damaged ---forward / reverse linkage damaged or disconnected --transport lever engaged --wheel keyway missing ---trans axle pulley damaged --trans axle damaged

MOre than likely is going to be a bad belt.

(Simple answer)Hydrostatic drive machines have a setting that allows you to push them. machine won`t move if this is engaged.
Also If park brake is on. Otherwise check drive belt has not snapped is loose or broken. Jack machine up and see if wheels will drive without weight of machine.

If it is the belt driven version you should have a deck belt and a drive belt. The drive belt is under the engine. If you have the hydraulic version check for a broken linkage at the pump.

If the unit will start and run and mower deck can be engaged but will not drive forward/reverse your hydro relief valve has failed.

Hi, remove the battery and battery support tray and clean all debris from around the hydrostatic drive, fan and cooling fins. Your problem is caused by the hydrostatic drive overheating. Hope this helps, regards Phil