Makita 6910 Instruction Manual

Also see for 6910: Parts list Parts Breakdown Instruction manual

Contents

9NOTE:• Hold the tool pointed straight at the bolt or nut.• Excessive fastening torque may damage the bolt/nut orsocket. Before starting your job, always perform a testoperation to determine the proper fastening time for yourbolt or nut.The fastening torque is affected by a wide variety of factorsincluding the following. After fastening, always check thetorque with a torque wrench.1. VoltageVoltage drop will cause a reduction in the fasteningtorque.2. Socket• Failure to use the correct size socket will cause areduction in the fastening torque.• A worn socket (wear on the hex end or square end)will cause a reduction in the fastening torque.3. Bolt• Even though the torque coefficient and the class ofbolt are the same, the proper fastening torque willdiffer according to the diameter of bolt.• Even though the diameters of bolts are the same, theproper fastening torque will differ according to thetorque coefficient, the class of bolt and the boltlength.4. The use of the universal joint or the extension bar some-what reduces the fastening force of the impact wrench.Compensate by fastening for a longer period of time.5. The manner of holding the tool or the material of drivingposition to be fastened will affect the torque.