Дело в переключателе перед\задней скорости
1.серва недовключает,нужно поставить обычную качалку и пружинки
2.если не поможет то разбирай коробку и меняй переключатель и возможно 2 шестерни рядом с ним toyhobby.ru/shop/catalog/product_info.php?cPath=26…
3.обороты двигателя на холостых при переключении reversa должны быть минимальными т.к. будет рвать переключатель.
Задний ход включается нормально . Разобрал коробку, на внешний вид все нормально слидов износа не нашел втулка с зубьями в засепеления входит нормально. При вращения главного выходнова вала . на полоусои передается вращения с прокрутами
проблему решил .на вале B3118 переломило ось и3125
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