Classic Unimogs / Classic 4x4 Technical FAQs for Unimogs Diagram of original Unimog 404 Crawler Gears. Diagram for Shifting a 406 20-Speed Transmission. Diagram of Unimog Construction Accessories. Unimog 406 Excavator / SEE Manuals. Hiab Crane Brochures & Manuals. Unimog Misc. Brochures & Manuals. Unimog Support Directory USA and Mogfest Article. Articles in Print on the Volvo C303 / TGB 11 SEE - FLU419 - HMMH - PDF Manuals – Expedition Imports Here are some of the Manuals we have collected on the U.S. Military SEE.