WAC 296-307-28064. Pulley maintenance

(1) Pulleys must be kept in proper alignment to prevent belts from running off. (2) Any pulley carrying a nonshifting belt should have a crowned face. (3) Cast-iron pulleys should be tested frequently with a hammer to detect cracks in rim or spokes. The sound is different depending on whether the belt is or is not on the pulley. (4) Split pulleys should be inspected to be sure that all bolts holding together the sections of the pulley are tight.