A schematic drawing of the Hino FD176 gearbox rebuild would typically include labeled diagrams of key components such as the main housing, gear sets, shafts, bearings, and synchronizers. It may also show the assembly sequence and the placement of seals and gaskets. The drawing serves as a visual guide for technicians to ensure proper reassembly and alignment, along with torque specifications for bolts. Additionally, it may highlight common wear points and maintenance checks during the rebuild process.