There's an Ashok Leyland Trucks Tech Manual PDF above the page.
The activities of the Ashok Leyland company began in the 40-50s. Years of practice have allowed manufacturers to hone their skill in manufacturing trucks.
The range of cars produced is quite wide. Here, trucks, and buses, and special-purpose vehicles.
The British company Leyland, by the way, played an important role in the production of Ashok Leyland trucks, because cars are manufactured according to a license issued by the British.
Today, part of Ashok Leyland is owned by the famous Iveco. Actually, that's why the trucks are equipped with engines from Iveco.