154hc-mast-sectionTower Crane swing
(1) the mounting support of slewing ring (the seat under the supporting ring and the seat on the upper surface of the inner ring) must be rigid enough and the mounting surface must be flat. Before assembling the slewing bearing, the bearing should be de-stressed to reduce the deformation of the slewing bearing.
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The contact surface between the support and the slewing bearing must be cleaned during assembly. (2) pay attention to the change of the noise and the change of the rotary resistance moment. If there is any abnormal phenomenon, it should be checked. (3) slewing bearings must be lifted or stored horizontally. Do not lift or store vertically to avoid deformation. (4) before the bolt is completely tightened, the gear meshing should be checked The meshing condition should meet the requirement of gear precision: that is, the contact spot on the tooth surface of the gear pair after running under slight brake is not less than 25% in the direction of the gear height and 30% in the direction of the gear length. (5) the tooth surface work 10 shifts should clear a sundry, and re-coated grease. (6) in order to ensure the reliability of bolt work and avoid the shortage of Bolt pre-tightening force, the pre-tightening Torque of bolt should be checked after the first 100 hours and 500 hours of slewing bearing work respectively. Pre-tightening torque should be checked every 1000 hours after this. (7) high strength bolts and nuts are used for the bolts and nuts connecting the slewing bearings; double nuts are used for fastening and anti-loosening. (8) when tightening nuts, should be in the bolt thread and nut end surface coated with lubricating oil, and should use torque wrench in the circumferential direction of symmetrical and even tightening many times. The pre-tightening Torque on each bolt should be approximately uniform during the last tightening. (9) four oil cups are arranged on the upper surface of the gear ring of the slewing support to align with the raceway, thereby lubricating grease is added to the raceway. Under normal conditions, the slewing bearing is lubricated once every 50 hours. Each time must add enough oil, until from the seal until the seepage of grease.
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