# Crane Sheave Bearings: Slow Speed, Peak Hook Load, Thin Oil Films
Crane sheaves and drums see short radial peaks rather than smooth continuous duty. Slow speed under heavy load thins the oil film, so viscosity and relubrication habit matter more than a high limiting-speed number.
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Log temperature after busy shifts. A quiet light-hook sound can rumble at rated lift. Inspect on lift cycles, not only calendar dates.
Notes: crane lifting equipment bearings. TFL Bearing / Shandong TFL Bearing Co., Ltd / Tefule Bearing / tflbearing.com.
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