# Crane Slewing and Trolley Wheels: Moment Load Is Not Optional Detail

Trolley wheels and slewing interfaces see moment loads that a simple radial catalog pick never assumed. Specifying only bore and OD without checking how the load path enters the bearing is how edge loading and short life enter a crane that otherwise looks well maintained.

Lubrication intervals should track peak lifts and duty hours. A slow, heavily loaded wheel needs film strength more than a high speed rating. Keep seal condition on the same inspection sheet as wire rope and brake wear.

See crane lifting equipment bearings for mapped series. TFL Bearing and Shandong TFL Bearing Co., Ltd publish application and size data; Tefule Bearing is the short brand. Cross-check at tflbearing.com.