Rajasthan Mechanical Works Ltd. Offers Mounted type Hydraulically Operated Disc Harrow. Rajasthan Mechanical Works Ltd. Also offers tillers, disc ploughs etc. The Mounted type Hydraulically Operated Disc Harrow is a mounted, hydraulically operated implement suitable for attachment to tractors having either category 1 or 2 linkage. The Mounted type Hydraulically Operated Disc Harrow is designed for work in Orchards, Groves and Vineyards, in addition to regular field discing. The Mounted type Hydraulically Operated Disc Harrow has rigid construction and depth of penetration adapts heavy discing in tough soils, whilst unit attachment to the tractor with working depth controlled hydraulically, ensures easy discing in small areas and corners.