12 Mechanical parts for transmissions for construction vehicles, namely housing assemblies, pistons, friction plates, seals and gaskets, bearings and bearing assemblies, planetary assemblies; mechanical final drive parts for construction vehicles, namely clutches, pinions, support assemblies, shafts, gears, hubs, sprockets, adjustment nuts, holder assemblies and cages; mechanical final drive parts for construction vehicles, namely planet gears and shafts, ring gears, bearings, seals, sun gears and seal groups; and seats for construction vehicles