John deere lt155 won't go in forward or reverse

SOURCE: kids john deere gator shifter won't go into reverse

I took the shift assembly apart. The switches weren't set in right. Once I put them in the shifter lined up and it works fine

SOURCE: I have a John Deere Ride on Toy stuck in reverse

Are the actual shifter levers not engaging or are the switches not clicking?
These Peg Perego Parts are available at http://www.shopjandl.com/, but I would check to make sure if it is the switches specifically or the levers under the shifter.
It is simple to check the shifter by taking the 2 screws out that hold the shifter in.
Hope this helps.
Let me know what you find.

SOURCE: John Deere Gator 4x2 - Left Wheel doesn't move when in 2nd gear

I would replace the high/low switch and the reverse switch. One time a replaced the high/low switch and the reverse switch quit on me 2 weeks later.
You can also get the Peg Perego Gator Shifter that upgrades the vehicle.
You can get the parts and repair help at this site
http://www.shopjandl.com/kids---baby-ride-on-toys-peg-perego-switches-and-shifters.html
They have helped me several times.
Hope this helps

SOURCE: Won't go forward, only in reverse

You need a forward/reverse switch, most likely.

http://www.rungreen.com/john_deere_peg_perego.html

You can replace the whole shifter for $28, but the switch may work fine.

SOURCE: Peg Perego John Deere tractor 12volt will only

check all wre connections are not dirty or loose!
lift out pedal swith to check there too!
Cheeers Rob