Panasonic EY7540 EY7540 User Guide - Page 12
Maintenance, Tightening, Torque
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VI. MAINTENANCE Use only a dry, soft cloth for wiping the unit. Do not use a damp cloth, thinner, benzine, or other volatile solvents for cleaning. VII. TIGHTENING TORQUE The power required for tightening a bolt will vary, according to bolt material and size, as well as the material being bolted. Choose the length of tightening time accordingly. Reference values are provided below. (They may vary according to tightening conditions.) Factors Affecting Tighten ing Torque The tightening torque is affected by a wide variety of factors including the followings. After tightening, always check the torque with a torque wrench. 1) Voltage When the battery pack becomes nearly discharged, the voltage decreases and the tightening torque drops. Bolt Tightening Conditions N ⋅ m (kgf-cm) 147.0 (1500) M8, M10 x 35 mm. M12 x 45 mm High tensile bolt (Bolt size: Millimeters) M12 98.0 (1000) Tightening torque 49.0 (500) M10 M8 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Tightening time (Sec.) Tightening torque M10 x 35 mm. M12, M14, M16 x 45 mm N ⋅ m (kgf-cm) Standard bolt 196.0 (2000) M16 147.0 (1500) 98.0 (1000) M14 M12 49.0 (500) M10 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Tightening time (Sec.) Bolt Washer Steel plate thickness10 mm (3/8") Nut Washer Spring washer Tightening conditions • The following bolts are used. Standard bolts: Strength type 4.8 High tensile type 12.9 Explanation of the strength type 4.8 Bolt yield point (80% of tensile strength) 32 kgf/mm2 (45000psi) Bolt tensile strength 40 kgf/mm2 (56000psi) 2) Tightening time Longer tightening time results in increased tightening torque. Excessive tightening, however, adds no value and reduces the life of the tool. 3) Different bolt diameters The size of the bolt diameter affects the tightening torque. Generally, as the bolt diameter increases, tightening torque rises. 4) Tightening conditions Tightening torque will vary, even with the same bolt, according to grade, length, and torque coefficient (the fixed coefficient indi cated by the manufacturer upon produc tion). - 12 -