Excavator, Backhoe, and Grader Operations
Excavator
The excavator works with three members: boom, stick, and bucket, mounted on a rotating upper structure. Plan the work so the machine swings the shortest arc between cut and truck, and so the truck sits where the operator has the clearest view - generally the cab side. Keep the tracks level and stable; on slopes, work over the idler or sprocket end rather than sideways. Know the machine's maximum reach and depth, and remember the load chart shrinks as reach increases. Never swing a loaded bucket over people, and never use the bucket for lifting unless the machine has a rated lifting capacity and a proper attachment.
Trenching with an excavator: keep the tracks back from the edge, spoil 2 feet back, and check depth frequently - the bucket's reach makes it easy to over-dig.
Backhoe
Lower the stabilizers and set the loader bucket as an anchor before digging. Dig with the boom and stick, not by curling the bucket through hard ground. The hoe end is for digging, not for lifting beyond its rating; the loader end is for carrying, not for excavating a foundation.
Motor grader
A grader shapes with the moldboard on a rotating circle. Key adjustments: blade angle (side-cast), pitch (roll material or cut), and wheel lean (counteract side draft, especially in the front axle). Articulation tightens the turning radius. Standard work: cutting a crown, ditching, spreading windrows, and fine-grading to stakes. Travel in the correct gear range and make several light passes rather than one heavy one.
Traps in questions
Watch for backhoes lifting at full reach at rated capacity, graders described as compactors, and excavators swinging loads over workers.
Rule of thumb
Keep everyone outside the swing radius plus a margin, and if the load chart does not cover the reach, do not lift.