the gears meshing conditions should be consistent with the requirements of precision

 Changes should be noted that the noise of tower cranes in use and turning resistance moment, if irregularities should be overhauled.

slewing lifting or storage must be level, not vertical lifting or storage, in order to avoid distortion.

 fully tighten the bolts in the past, should be checked meshing gears, the gears meshing conditions should be consistent with the requirements of precision: the contact spots that slight braking gear pair at the tooth surface distribution of the latter is not running in the tooth height direction less Bearing test machine‍ than 25% in the longitudinal direction of the tooth is not less than 30%.

 tooth surface work 10 shift debris should be removed once and re-coated with grease.

To ensure the reliability of the bolt work, avoid inadequate bolt preload, the first 100 hours and 500 hours after slewing work should be separately checked pretension bolts. Then every 1000 hours of operation should be checked once pretension.

 connection slewing ring bolts and nuts high speed bearing‍ are made of high-strength bolts and nuts; double nuts and lock.

 When tightening the nut, should topcoat oil and nuts threaded end of the bolt and torque wrench should be used uniformly in the circumferential direction of symmetry repeatedly tightened. Finally, tighten again when the bolt tightening torque of each should be roughly uniform.

On the slewing ring raceway surface parts are aligned cloth 4 cup oil, thereby adding grease to the Raceway. Under normal circumstances, slewing operation 50 hours lubricated once. Every time you must add a little oil until the oil leaking from the seal so far.‍