(1) The mounting support of the slewing bearing (the seat supporting the bottom surface of the ring gear and the seat placed on the upper surface of the inner ring) must have sufficient rigidity, and the mounting surface should be flat. Before assembling the slewing bearing, the bearing should be relieved of stress to reduce the deformation of the slewing bearing. The contact surface of the bearing and the slewing bearing must be cleaned up during assembly.
(2) During use, attention should be paid to changes in noise and changes in rotational resistance torque.
(3) The slewing bearing must be lifted or stored horizontally. Do not lift or store vertically to avoid deformation.
(4) Before the bolts are fully tightened, the gear meshing inspection should be performed, and the meshing condition should meet the requirements of gear accuracy: that is, the contact spots distributed on the tooth surface of the gear pair after running under slight braking are in the direction of the gear tooth height Not less than 25%, not less than 30% in the length direction of gear teeth.
(5) The debris should be removed once after 10 shifts on the tooth surface, and grease should be reapplied.
(6) In order to ensure the reliability of the bolt work and avoid the insufficient preload of the bolt, the preload torque of the bolt should be checked separately after the first 100 hours and 500 hours of the slewing bearing. Every 1000 hours thereafter, the pre-tightening torque should be checked.
(7) High-strength bolts and nuts are used for bolts and nuts connected to the slewing bearing; double nuts are used for fastening and anti-loosening.
(8) When tightening the nut, the thread of the bolt and the end surface of the nut should be coated with lubricating oil, and the torque wrench should be tightened symmetrically and evenly in the circumferential direction multiple times. During the final tightening, the pre-tightening torque on each bolt should be approximately uniform.
(9) Four oil cups are evenly distributed on the part where the upper surface of the ring gear of the slewing ring is aligned with the raceway, thereby adding grease to the raceway. Under normal circumstances, the slewing bearing is lubricated once every 50 hours. Each time you add oil, you must add enough oil until grease leaks from the seal.
In addition, before each tower crane starts, it is necessary to run the tower crane empty car and check the following items, so as to prevent accidents.
