In this study we used moldboard plough with three ploughing depths (10,15and 20) cm for loading the engine of Anter 80 tractor to study the specific fuel capacity) and found the suitable pressure of rear wheels. The study used four forward speeds (0.48, 0.78,1.20,1.68)m/sec and three different pressure rear wheel tires (0.75, 1 and 1.5) bar. The results showed that increased fuel consumption capacity with increased the forward speed .The specific fuel consumption was increased by50% when the forward speed increased from (0.48) to (1.68) m/sec. The pressure of rear tires   1 bar of rear tires   showed lower fuel consumption capacity. The specific fuel consumption capacity was higher with   ploughing depth 15cm than (10 to20) cm. The specific maximum traction efficiency were (0.73, 0.75, 0.81) pressure rear wheel tires (0.75. 1 and 1.5) bar respectively .The pressure 1bar gave maximum draft force (8-22)kN in. The optimum traction efficiency with pressure in rear tires was1 bar showed decreased fuel consumption respectively (0.17kg/kw.h)