The ER Series of worm gear units are direct replacements for the David Brown (Radicon) Series A heavy duty worm gear units. All critical dimensions and product quality is the same and the ER heavy duty worm gear range is available in the following types: The ER Series of worm gear units are direct replacements for the David Brown (Radicon) Series A heavy duty worm gear units. All critical dimensions and product quality is the same and the ER heavy duty worm gear range is available in the following types: Underdriven ER - UOverdriven ER - OVertical ER – V The units provide power capacity up to 320 Kw in 4 sizes with worm gear centres from 10 inch to 17 inch. All worm gear units are offered with a choice of 11 standard ratios from 5 – 1 up to 70 – 1. The high quality design and engineering of the ER worm gear range makes the product an ideal solution for the most arduous of industries and applications. Unit Sizes 10, 12, 14, 17 Input Power Up to 430 HP (320 kW) Output Torque Up to 275000 lb.in (31000 Nm) Gear Ratios Up to 70/1 in single stage, 4900:1 in double reduction