Caterpillar 797B

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Caterpillar 797B
Manufacturer Caterpillar Inc.
Production Spring 2002 - December 2009
Assembly North America
Body and chassis
Class Ultra
Body style 2-door Dump
Layout Front-engine, rear-wheel-drive layout
Engine Caterpillar 7,143 cu in (117 L) 3524B V-12 x 2 (t/c diesel)
Transmission 7-speed planetary gearset mechanical
Wheelbase 23 ft 7 in (7,188 mm)
Length 47 ft 5 in (14,453 mm)
Width 32 ft 0 in (9,754 mm) - overall tire width (fully loaded)
Height 21 ft 6 in (6,553 mm) - to top of ROPS (empty)
Curb weight 1,375,000 lb (623,690 kg)
Predecessor 797
Successor 797F
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.


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]


Unlike its primary competitors which use diesel-electric powertrains, the Caterpillar 797B employs a mechanical drive powertrain.[4] Caterpillar is the only manufacturer of ultra class haul trucks that feature mechanical powertrains; all ultra class haul trucks offered by competitors employ diesel-electric powertrains.

797B Engine[edit]

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 engine 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]


The 797B is equipped with a rear axle mounted, computer controlled, seven speed planetary transmission with an integral lock-up torque converter.[8]

Wheels and Tires[edit]

The Caterpillar 797B uses six 5,300 kg (11,680 lb) Michelin 59/80R63 XDR radial tires.[9]

797 Series Specifications[edit]

Caterpillar 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 1,200 US gal (4,542 l) 1,200 US gal (4,542 l) 1,000 US gal (3,785 l)

See also[edit]



External links[edit]