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“YASH” Reduction Gear Boxes are of robust construction, are manufactured in “adoptable” as well as “Horizontal & Vertical” fix foot mounted type.

Standard gear boxes are available in various sizes ranging from 28.5 mm(1.125 inch) center distance to 400 mm (16.00 inch) center distance and ratios are available from 5:1 to 70:1 in single reduction, and even much higher ratios available in double reduction units ranging from 100:1 to 4900:1.

Wherever applicable British as well as Indian Standards are used. The design standards are mainly based on B.S. -721.

Gear Case
Made of close grained cast iron, and of mono block body designed upto 6.00” center Height in “YNU” models, gear case is completely oil tight & dust proof. Gear case is of stream lined design and modern in appearance. The faces and boxes are accurately machined on precision horizontal boring machine to achieve perfect alignment.

Worm Wheel
Worm Wheels are made of sand or centrifugally cast phosphor-bronze(pb2-c) rims shrin fitted and screwed on cast-iron centres. Worm wheels are accurately hobbed on precision hobbing machine with high accuracy hobs. Each worm wheel is checked to match with master worms to ensure inter changeability.

Worm shaft (Worm)
Worm is integral with the shaft, made of high grade alloy steel, is case hardened and "profiel Ground" on imported thread grinding machine [Klingelnberg Germany]

In general, worm & worm wheel shaft are mounted on anti-friction taper roller bearings of ample capacity to take journal as well as thrust loads, other type of bearings can be used for special application.

The wheel shaft is made of high-grade alloy steel and of larger diameter to carry torsional as well as bending and overhung load.

Lubrication is done by splash of oil from the sump to all rotating parts, lubrication is positive to either direction and at any speed of rotation, no special attention is necessary except periodic Checking of oil level. A large filler cum breather plug together with oil level indicator and drain plug is provided.

  • In "Fit & Forget" series no special attension is required except leackage checking.
  • Warning : Do not open or mix conventional grease or oil with synthetic lubricants, it may damage the properties of synthetic lubricants.

Large cooling fins are provided on all sides of body for sufficient cooling. For sizes over 3.00 inch centre distance, fan & fan cover is provided for extra cooling & better efficiency.

Testing & Inspection
All gearboxes are tested up to 5 hours on no load to check oil leakage, noise level & temperature.