The mechanical parts in mutual rotation must be periodically inspected, controlling the tightness of the nuts, screws and bolts in order to check any loosening. Before use, visually check fixing screws and nuts of the fifth wheel to the chassis and turret, of the reducer, the connection of the bracket fixing the rotating joint to the turret, the pin retainers, every other bolt, especially the parts subject to vibrations and movements. Before use, visually check all structural components in order to check for cracks in the welding, corrosion or signs of deterioration. After the first 100 hours and, successively, every 3 months or 500 hours, check:
• the tightness of the fifth wheel fixing nuts with dynamometric wrench (consult the "Coupling torques) table
• the tightness of all turret rotation reducer bolts with dynamometric wrench (consult the "Coupling torques") table.