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Feb 5, 2017 - This instruction manual contains important information regarding the installation, maintenance and troubleshooting of the Jamesbury® MJ Jackscrew Manual. † For loads of 25% to 100% of actuator capacity, torque requirements are approximately proportional to the load. 2.2 Sym-metric Screw Jack Efficiencies. Model. 15 TON SCREW-TYPE. SUPPORT JACK. OWNER'S MANUAL. WARNING: Read carefully and understand all ASSEMBLY AND OPERATION. INSTRUCTIONS most variations of the Joyce/Dayton Machine Screw Jack, there may be some jacks that vary significantly from this manual. For special jacks not covered, please Ball Screw Jack Series(BSJ?BXJ?BJV?BTJ?BTV?JB?JTB) Get through the instructions contained herein before installing and operating the product. Keep this1252 products -