[Solved] MTD B115 Tractor: Transmission Assembly Queries - Gearbox, Reverse Gear & Gears 15/16 on Shaft 13

Hello. I have a MTD B115 tractor. I bought it with the gearbox unfolded. I put everything together and the box walks but I don't have reverse gear. When the reverse engine is turned on, the engine gets resistance and the belts start to burn. My question that came to my mind when assembling the chest. Will Gear No. 15 and May 16 move around on fight No. 13? Because as I noticed one of them is movable and the other one is rigid. On my peasant reason should probably move, but I prefer to deal with "professional strength" Thank you for your help
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I made such gears at home. These modes 15 and 16 must be movable. In the photo, the blue marked fangs enter the red spots in the gears, which are responsible for whether the tractor travels forward or backward. You have yellow fingers as if they overlap yellow, between the gears with fangs. One of the gears is locked and therefore does not go back and burns the belt.
There are other markings in the picture but the transmission is the same.

Thank you for your answer. I came to the same conclusion that it would work, these wheels must be mobile. Thank you for your help.

After starting the baked wheel in the box everything works as it should. Thanks for the help