Information Bulletin: Otis CT driving-machine outboard sheave shaft bearing lubrication

This Information Bulletin is to notify elevating devices contractors about potential failure of the outboard sheave shaft bearing on this type of machine due to a lack of lubrication of this bearing. This failure may affect and cause, in turn, failure of other driving-machine components, e.g., the worm or gear, rendering the elevator operation unsafe.

Recently, two units with this type of machine suffered outboard sheave shaft bearing failures due to a lack of lubrication. It is possible for the sheave to be disconnected from the mechanical power source when this bearing fails.

CT driving-machine outboard sheave shaft bearng caps have a plug installed in them. The plug is to be removed and a grease nipple installed. The bearing should be lubricated with Shell Alvania EP2 grease or equivalent. Care should be taken not to over-grease.

Janice Lee, P. Eng.

Provincial Elevating Devices Safety Manager

References:

Bill 19 – 2003                Safety Standards Act

B.C. Reg. 105/2004       Safety Standards General Regulation

B.C. Reg. 101/2004       Elevating Devices Safety Regulation

B.C. Reg. 137/2004       Safety Standards Act Repeal and Transitional Provisions Regulations