Caterpillar 797B
| Manufacturer | Caterpillar Inc. |
|---|---|
| Production | Spring 2002 - December 2009 |
| Assembly | North America |
| Predecessor | 797 |
| Successor | 797F |
| Class | Ultra class |
| Body style | Dump truck |
| Layout | Front engine, rear wheel drive |
| Engine | Caterpillar 3524B High Displacement EUI Arrangement: V-12 x 2 Capacity: 7,143 cubic inches (117.05 L) Power: 3,370 horsepower (2,510 kW) |
| Transmission | Mechanical, seven speed planetary gearset |
| Wheelbase | 23 ft 7 in (7.19 m) |
| Length | 47 ft 5 in (14.45 m) |
| Width | 32 ft 0 in (9.75 m) - overall tire width (fully loaded) |
| Height | 21 ft 6 in (6.55 m) - to top of ROPS (empty) |
| Curb weight | 1,375,000 pounds (623,700 kg) |
- for an overview of the Caterpillar 797 series, see: Caterpillar 797
The Caterpillar 797B is an off-highway, ultra class, two-axle, mechanical powertrain haul truck developed and manufactured by Caterpillar Inc. in the United States specifically for high production mining and heavy-duty construction applications world-wide.[1] The 797B is the second generation of the 797 series. The 797B was introduced to the public in spring of 2002 and first entered service with a customer in October, 2002.[2] The 797B remained in production until December, 2009 when Caterpillar started full production of the 797B's successor, the 797F.[3] While it was in production, the 797B was Caterpillar's largest, highest payload capacity haul truck model.
Contents |
[edit] Improvements
Compared to the first generation 797, the 797B has a larger payload capacity and a more powerful engine. These changes allowed Caterpillar to meet mine operators' needs to increase operational efficiency and reduce costs by increasing the amount of material hauled per trip.[4]
The 797B's increased payload capacity of 380 short tons (345 t) is a 20 short tons (18.1 t) increase over the first generation 797. Caterpillar increased the power output of the Cat 3524B EUI 24-cylinder diesel engine used in the 797 from net 3,211 hp (2,394 kW) to net 3,370 hp (2,513 kW) enabling the 797B to achieve a 42 mph (68 km/h) top speed when transporting a 380 short tons (345 t) load, a two mile per hour increase over the first generation 797.[5]
[edit] Powertrain
The Caterpillar 797B employs a mechanical drive powertrain in contrast to the diesel-electric powertrains used in comparable competitor haul trucks.[4] Caterpillar is the only manufacturer of ultra class haul trucks to employ a mechanical powertrain; all ultra class haul trucks offered by competitors employ diesel-electric powertrains.
[edit] 797B Engine
A gross 3,550 hp (2,647 kW) [net 3,370 hp (2,513 kW)], twin turbocharged version of the Cat 3524B engine powers the 797B.[6] The power rating of the 3524B is valid up to an elevation of 8,500 ft (2,591 m) or 15,000 ft (4,572 m) with a high altitude arrangement.[7]
[edit] Transmission
The 797B is equipped with a rear axle mounted, computer controlled, seven speed planetary transmission with an integral lock-up torque converter.[8]
[edit] Wheels and Tires
The Caterpillar 797B uses six 5,300 kg (11,680 lb) Michelin 59/80R63 XDR radial tires.[9]
[edit] 797 Series Specifications
| Specification | 797 | 797B | 797F |
|---|---|---|---|
| Introduction to Service | 1999 | 2002 | 2008 |
| Nominal Payload Capacity | 360 short tons (327 t) | 380 short tons (345 t) | 400 short tons (363 t) |
| Gross Machine Operating Weight | 1,230,000 lb (557,900 kg) | 1,375,000 lb (623,700 kg) | 1,375,000 lb (623,700 kg) |
| Engine Model | 3524B High Displacement EUI | Cat 3524B High Displacement EUI | Cat C175-20 ACERT |
| Engine Arrangement | V-12 x 2 | V-12 x 2 | V-20 |
| Engine Power | 3,211 hp (2,394 kW) net | 3,370 hp (2,513 kW) net (SAE J1349) | 3,793 hp (2,828 kW) net (SAE J1349) |
| Top Speed (Loaded) | 40 mph (64 km/h) | 42 mph (68 km/h) | 42 mph (68 km/h) |
| Overall Height to Top of ROPS (Empty) | 23 ft 8 in (7.21 m) | 24 ft 11 in (7.59 m) | 24 ft 5 in (7.44 m) |
| Overall Height (Body Raised) | 49 ft 3 in (15.01 m) | 50 ft 2 in (15.29 m) | 51 ft 6 in (15.70 m) |
| Overall Length | 47 ft 7 in (14.50 m) | 47 ft 5 in (14.45 m) | 49 ft 6 in (15.09 m) |
| Overall Tire Width (loaded) | 30 ft 0 in (9.14 m) | 32 ft 0 in (9.75 m) | 31 ft 3 in (9.53 m) |
| Fuel Capacity | 1,000 US gal (3,785 l) | 1,800 US gal (6,814 l) | 1,000 US gal (3,785 l) |
[edit] See also
[edit] Notes
- ^ Caterpillar Inc. 2009.
- ^ Orlemann 2003, p. 319.
- ^ Caterpillar Inc. 2009a.
- ^ a b Mercer 1999, p. 1.
- ^ Caterpillar Inc. 2003, p. 19.
- ^ Caterpillar Inc. 2003, p. 1.
- ^ Caterpillar Inc. 2003, p. 4.
- ^ Caterpillar Inc. 2003, p. 5.
- ^ Manufacture Française des Pneumatiques Michelin 2007, p. 15.
[edit] References
- "Caterpillar 797B Mining Truck Product Brochure AEHQ5511" (PDF). cat.com. Caterpillar Inc. 12 2003. Archived from the original on 2009-10-27. http://www.webcitation.org/5kqmQ4sYK. Retrieved 2009-10-28. "... Net Power - Cat 3,370 hp....Nominal Payload Capacity 380 tons ..."
- "Release Number: 231PR09 - Caterpillar Moves Forward with New Large Mining Trucks" (Microsoft Word 97-2003 Document) (Press release). Caterpillar Inc. 2009-07. Archived from the original on 2009-10-21. http://www.webcitation.org/5khQOT0RQ. Retrieved 2009-10-21. "... go into full production...late this year."
- "Off-Highway Trucks from Caterpillar". cat.com. Caterpillar Inc. Archived from the original on 2009-10-21. http://www.webcitation.org/5khMDWHyR. Retrieved 2009-10-21. "Developed specifically for high production mining and heavy-duty construction applications ..."
- Orlemann, Eric C. (2003). Steve Gansen. ed. The Caterpillar Century. United States of America: Motorbook International. ISBN 0-7603-1882-4. http://books.google.com/books?id=073x8SEhQIwC&printsec=frontcover&source=gbs_v2_summary_r&cad=0#v=onepage&q=&f=false. Retrieved 2009-10-27.
- Mercer, Mike (06 1999). "A look at Cat's new 797 haul truck - Caterpillar Inc". Diesel Progress North American Edition. CBS Interactive Inc. http://findarticles.com/p/articles/mi_m0FZX/is_6_65/ai_55084212/. Retrieved 2009-10-27. "Caterpillar designed the truck in response to mining companies seeking a means to reduce cost per ton ..."
- "Michelin Factbook - 2007 Edition" (Shockwave Flash Presentation). michelin.com. Manufacture Française des Pneumatiques Michelin. 2007. Archived from the original on 2009-10-27. http://www.webcitation.org/5kqaUeJSE. Retrieved 2009-10-27. "59/80 R 63 Michelin XDR Diameter: 4,028 meters...Weight: 5,300 kg ..."
[edit] External links
- Caterpillar 797B Mining Truck Product Brochure AEHQ5511 (PDF)
- Product Safety > Off-Highway Tractors and Trucks - Caterpillar Inc.
- Viewpoint - Perspectives on Modern Mining - Caterpillar Inc.
