MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH High-Strength Bolt Connections (continued) Check fastening of power house frame (01) to superstructure main frame, illust. Z 20705 Reference No.: Qty. (02) 28 (03) 28 * SW = Wrench size 381 Bolt size mm Grade SW * mm Tightening torque Nm M30 10.9 46 1770 Washer