Dozer, Loader, and Scraper Operations
Dozer
Dozers push, rip, spread, and backfill. Blade choices matter: a straight (S) blade is for heavy pushing and precision work, a universal (U) blade rolls and holds large volumes, and an angle blade side-casts material for ditching and road work. Blade tilt, pitch, and float change how the blade follows the ground.
Efficient techniques: slot dozing (pushing in a channel so material rolls against itself, reducing losses at the sides), dozing downhill where safe, ripping rock in the direction of the seam, and back-blading to leave a clean surface. Keep the cut shallow and consistent; spinning tracks wastes time and damages the surface.
Loader
A loader cycle is load, carry, dump, and return. Fill the bucket by crowding low and curling as you lift; keep the load low and the bucket rolled back while traveling; load trucks from the side or rear where the operator has clear visibility; never turn with a raised bucket or travel with the bucket at eye level. Bucket fill factor depends on material - over 100% in easy digging, well under in rock.
Scraper
A scraper loads, hauls, spreads, and returns, with the bowl, apron, and ejector controlling the cut and the dump. Self-loading elevating scrapers work in friable material; push-loading with a dozer suits tight, hard cuts. Spread in thin, uniform lifts and keep haul roads maintained - a scraper's productivity lives or dies on rolling resistance.
Traps in questions
Expect a dozer called a compactor, a loader expected to dig a basement, or a scraper used for fine grading. Another trap is traveling with a raised, loaded bucket.
Rule of thumb
Match the haul distance: loaders for short cycles (roughly a few hundred feet), scrapers for medium hauls, trucks beyond that.