MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH High-Strength Bolt Connections (continued) Swing circle, illust. Z 20614 Check tightening torque of inner and outer mounting bolts (02 and 04) according to PARTS & SERVICE NEWS, No. AH00511. NOTICE Checking/retightening of swing circle mounting bolts is only necessary after the first 1000 operating hours. Check condition and fastening of swing circle guard (10) and bolts (15). 401