How to check a crane's slewing ring for 'Play' or gear tooth wear under load?

To check slewing ring play, position dial indicators at multiple points around the turntable bearing race. Apply alternating rotational torque in both directions using the swing motor or manual force while monitoring dial indicator readings. Acceptable play typically ranges from 0.003" to 0.015" depending on bearing size and manufacturer specifications. Excessive movement indicates worn bearing races or loose mounting bolts.