4 Nov 2009 Maintain firm hand control of torque wrench or input handle when releasing multiplier, since 2.6 Use only Hydratight Sweeney approved output square drives. Hydratight's Torque Multiplier operation manuals and parts lists cover information for models: 290Plus, 291, 292, 3900A, 391A, 392C, 393B, 394B, 395B, 396B, 3990, 491, 492, and 493. 3900A Torque Multiplier Operating Manual. 391A Torque Multiplier Operating Manual. High efficiency planetary gear sets achieve high output torque from low input torque; Most models operator protected by anti-backlash device; Multiplier output All the torque tools, and measuring devices produced by Norbar.400203 Manual Torque Multipliers are a quick and easy way to safely multiply ?" Square Drive Input; 1" Square Drive Output; 393B Sweeney; Weight: 8.3kg A torque multiplier is a tool used to provide a mechanical advantage in applying torque to turn power, or where cost considerations require manually operated tools which do not require any power supply or power source of any kind. This manual contains operation and service instructions for Torque Multiplier and lift sets manufactured by SWEENEY a HYDRATIGHT company. 1-6. 1-2. Sweeney torque multipliers are proudly made in the USA and consist of the high . (Manual). Electric Drive kit 2864-330 also available. 391-100. 2864-15. Sweeney torque multipliers are the industry standard. For over 56 years we . Note: For manual operation in applying torque, models 53,. 63 and the 67 hand