Asaam Agricultural University, Jorhat-785 013
Traction performance of 61 models of Indian tractors under three size groups viz. small (< 18 kW). medium (18–26 kW) and large (> 26 kW) have been analysed based do CFMTTI, Budni tractor test results. The result of the analysis reveals that the values of traction co-efficient (ratio of drawbar pull to drive wheel load) are more under unballasted condition than that under ballasted condition for all models of tractor under study. Traction coefficient varies among the different models of tractors. Similarly, the tractive efficiency (drawbar power to pto power ratio) are also found to vary among the different models of tractor irrespective of their sizes. These variations, which were observed even on the performance on concrete test terrain, might be the reason of improper matching of wheel load (ballast), power and tyre size.
