Dozer
A dozer (bulldozer, crawler dozer) is a tracked machine that pushes material with a wide front-mounted blade. It is the industry's primary tool for bulk pushing, stripping, rough and finish grading, and land clearing, with a class range that runs from small utility machines to mining-scale tractors.
Cat classes
Choisissez une classe de taille : la capacité et la portée varient selon la gamme.
Fonctionnement
A diesel engine drives the tracks through a hydrostatic transmission on smaller machines or a torque-divider powershift on larger ones, putting engine power into drawbar pull through a long track-on-grade footprint. The blade is raised, lowered, angled and tilted by hydraulic cylinders; material is cut on the forward pass, rolled in front of the blade, and drifted to the fill. Grade control has become integral to the class: GPS/GNSS or laser systems drive the blade automatically to design surface, enabling finish grade directly. Rear-mounted rippers on larger machines fracture rock and hardpan so it can be dozed rather than blasted or hammered.
Types et variantes
- Small / utility dozers
- Up to 90 hp: residential pads, backfilling and finish work with light ground pressure.
- Mid-size dozers
- 90-200 hp core of the class for site development, road building and bulk grading.
- Large / mining-class dozers
- 200 hp and above, pushing high volumes, ripping rock and supporting production fleets.
- LGP (low ground pressure) configurations
- Wide tracks and gauge for soft ground, wetlands and finished-subgrade work.
- Waste-handling configurations
- Sealed, guarded machines with trash racks for landfill duty.
- Winch and ripper configurations
- Rear implements for forestry recovery and rock/hardpan fracturing.
Spécifications clés
| Spécification | Plage typique | Signification |
|---|---|---|
| Engine power | 77.6-1019.2 hp | The class's primary sizing dimension; the rental industry bands machines at up to 90, 90-130, 130-200, 200-300 and 300+ hp. |
| Fuel tank capacity | 117.3-405.0 L | Sized for full-shift high-load duty across the catalog reporting data. |
| Operating weight | 15,633–254,195 lb (7,091–115,301 kg) | Tracks engine power closely; heavier machines carry larger blades and deliver higher drawbar pull. |
Comment l'industrie le dimensionne
Dozers are sized by engine horsepower, with operating weight and blade capacity tracking it closely. The rental industry bands the class at up to 90, 90-130, 130-200, 200-300 and 300+ hp. Selection is a production calculation: blade capacity times cycle speed must meet the required volume, while ground pressure and transport class set the practical limits. Small machines move on tag trailers; mid-size and larger are lowboy freight, with the largest requiring permits and partial disassembly.
Applications
- Bulk earthmoving: stripping, cut-to-fill pushing and pad building
- Rough and finish grading with GPS/laser blade control
- Land clearing and grubbing ahead of development
- Road, highway and haul-road construction and maintenance
- Ripping rock, hardpan and frost with rear rippers
- Landfill spreading and compaction support in waste configurations
Sécurité et opération
- Work slopes up-and-down rather than across where possible, and know the machine's slope limits: sidehill rollover is the class's defining hazard.
- Keep ground personnel out of the blind arc; the blade and ripper hide close-in visibility front and rear.
- Use ROPS seat belts without exception: an unbelted operator does not survive the rollover the structure is built for.
- Control dust on dry pushes; visibility loss at the fill edge precedes over-the-edge incidents.
- On steep fills and dumps, push to a windrow edge rather than the crest, and keep tracks square to the edge.
Normes et certifications
- ISO · ISO 3471
- Roll-over protective structure performance requirements for crawler machines.
- OSHA · 29 CFR 1926.602
- Material handling equipment rules covering dozers on construction sites.
- EPA · Tier 4 Final (40 CFR Part 1039)
- Nonroad diesel emissions certification for current-production engines.
- SAE · SAE J1040
- Performance criteria for ROPS on construction machines, referenced alongside ISO 3471.
Questions fréquentes
What horsepower dozer fits typical site work?
What does LGP mean?
What is a ripper for?
How are dozers transported?
Comparer les modèles populaires
Chercher par spécification →Normalisé aux mêmes unités. Un tiret signifie que la valeur n'a pas été publiée.
| Modèle | Poids en service | Profondeur d’excavation max | Portée max | Puissance moteur |
|---|---|---|---|---|
| John Deere 850P | - | 2.3 ft (0.7 m) | - | - |
| Case 2050M | 44,562 lb (20,213 kg) | - | - | 215 hp |
| Case 750M | - | - | - | - |
| Case 1150M | - | - | - | 138 hp |
| Komatsu D155AX-8 | 89,300 lb (40,506 kg) | - | - | 354 hp |
| John Deere 450P | - | 1.7 ft (0.5 m) | - | - |
Parcourir par fabricant
Sources
Chaque spécification est vérifiée par rapport aux données publiées par le fabricant, avec la source liée pour référence.