Plant oiler – Knowledge and ability to properly perform basic plant preventive maintenance to include but not limited to proper greasing techniques, amounts and schedules, installing, repairing or replacing grease lines, oil changes in speed reducers, crushers, feeders and screen units, and proper oil sampling techniques. Plant maintenance mechanic – knowledge and ability to properly perform basic plant maintenance to include but not limited to splicing conveyor belt, tracking conveyor belt, replacing conveyor idlers, pulleys and bearings, replacing V-belts, and replacing screen media.