Table of ContentsService Instructions 755 A/756 A - 00.0 - 02/2019 11 About these instructions ........................................................... 71.1 For whom are these instructions intended?.................................. 71.2 Representation conventions – symbols and characters ............... 71.3 Other documents .......................................................................... 91.4 Liability.......................................................................................... 92 Safety ......................................................................................... 112.1 Basic safety instructions ............................................................. 112.2 Signal words and symbols used in warnings .............................. 123 Working basis ........................................................................... 153.1 Gages ......................................................................................... 153.2 Locking the machine in place ..................................................... 153.3 Swiveling up the machine head .................................................. 163.4 Swiveling down the machine head ............................................. 183.5 Setting the handwheel scale....................................................... 204 Aligning the machine head ...................................................... 215 Disassembling and assembling the machine head............... 255.1 Disassembling the machine head............................................... 255.2 Assembling machine head ......................................................... 266 Needle bar ................................................................................. 286.1 Non-switchable needle bar (class 755)....................................... 286.1.1 Aligning the needle bar with the throat plate .............................. 286.1.2 Setting the needle bar height...................................................... 326.1.3 Changing the needle holder ....................................................... 346.1.4 Disassembling the needle bar linkage ........................................ 356.1.5 Assembling the needle bar linkage............................................. 376.2 Switchable needle bar (class 756).............................................. 406.2.1 Aligning the needle bars with the throat plate............................. 406.2.2 Setting the needle bar height...................................................... 436.2.3 Changing the needle holder ....................................................... 446.2.4 Disassembling the needle bar linkage ........................................ 456.2.5 Assembling the needle bar linkage............................................. 486.2.6 Disassembling the needle bar linkage ........................................ 546.2.7 Assembling the needle bar linkage............................................. 586.3 Setting the needle transport ....................................................... 627 Hook........................................................................................... 647.1 Changing the hook ..................................................................... 647.2 Setting the loop stroke ................................................................ 657.3 Setting the distance between hook tips and needles ................. 677.4 Setting the needle guard ............................................................ 697.5 Setting the bobbin case lifter ...................................................... 717.5.1 Setting the timing for opening ..................................................... 727.5.2 Setting the lifting gap .................................................................. 748 Setting the safety clutch .......................................................... 758.1 Engaging the safety clutch ......................................................... 758.2 Setting the torque ....................................................................... 76
