MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH High-Strength Bolt Connections (continued) Check mounting of Operator’s cab, illust. Z 22663 G Check tightening torque of mounting bolts as indicated in the illustration. G Check condition and fastening of chains (1). G Check the silicone oil filled viscous mounts (2) for leakage and signs of fatigue. 373