Excavators, cranes and rotary drilling rigs operate in dust, mud, shock and heavy load. This article summarises maintenance essentials: greasing slewing rings every 50–100 running hours (more often in dusty sites) while slewing slowly to distribute grease, checking tooth wear and mesh clearance, watching for rising swing clearance as a wear indicator, keeping travel-machinery seals intact and gear-oil levels correct. Hengtuo supplies ball and roller bearings for slewing and travel applications plus lubrication-cycle recommendations to cut lifecycle cost.