combinations. Per cent cleaning efficiency ranged from 98.20 to 99.30. Amongst combinations selected based on per cent grain breakage and cleaning efficiency the recommended treatment combination was PS2F3. Optimum combination of peripheral speed and feed rate for threshing of pigeonpea on modified commercially available wheat thresher were 18.2 m/s and 1000 kg/h, respectively. At this combination the per cent grain breakage was 0.68, per cent non collectable losses were 0.27, per cent cleaning efficiency was 98.63 and per cent threshing efficiency was 99.56. The thresher is suitable for threshing pigeonpea at optimum settings.