Part NumberIssueDatePage61599388801301/2018180 / 24901/2018 180 (249)17.4 Loose and TighteningBreakaway is by far the best and most commonly used method. But, when a bolt has been tightenedsome time ago and there is rust or other conditions that could increase static torque, the suggestedevaluation method is to loosen the bolt up to the target angle and re-tighten it back to the “zerooriginal position”.Specify the torque limits. The residual torque result is the torque at the end of the retighteningoperation (measured when the original zero angle position is reached back).The Target Angle is usually set to a few degrees; if it is set too high, torque during the opening phasecould go under the cycle start value. In that case, the angle counting would stop, making the testimpossible.If the operator goes over the Change Screw value during the residual torque check, a message isshown on the display to indicate that the screw must be replaced with a new oneThe Angle LED, Torque LED and buzzer devices are activated as follows:ANGLE LED (during the INTERMEDIATE steps of the test)Green LED It lights when the Loosening Target Angle is reached (when the Re-tightening step starts, the Green LED turns off) It lights when the Re-tightening Angle (original zero angle position) isreached, once the Loosening Target Angle has been crossedBlinking Yellow LED It lights when the Loosening step is preceded by the Re-tightening step,causing a screw movementNOTE: The Blinking Yellow LED is matched with a warning beepTORQUE LED (at the END of the test)Green LED It lights when the Loose and tightening process is successfully completedwithin Torque LimitsTarget angleTorqueAngleLooseningOriginal zero angle positionTorqueAngleTightening
