Caterpillar 797F
The Caterpillar 797F 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 worldwide. The 797F is the third and current generation model of the 797 series, and is Caterpillar's largest, highest payload capacity haul truck.
Debut
Caterpillar introduced the 797F to the public at MINExpo International in September, 2008. The 797F replaced its predecessor model, the 797B, when the 797F entered full production in late 2009. Prior to the introduction of the Caterpillar 797F and the Bucyrus MT6300AC at MINExpo International in September, 2008, the Liebherr T 282B, introduced in 2004, was the only haul truck with a payload capacity of.Improvements
Compared to the 797B, the 797F has a higher payload capacity and a more powerful, more efficient engine. These changes allowed Caterpillar to meet mine operator's needs to increase operational efficiency and reduce costs by increasing the amount of material hauled per trip.The 797F's increased payload capacity of is a increase over the 797B.
Caterpillar replaced the gross Cat 3524B EUI 24-cylinder diesel engine used in the 797B with the gross Cat C175-20 ACERT 20-cylinder diesel engine, enabling the 797F to maintain the top speed of the 797B while transporting a heavier payload.
Powertrain
Engine
A gross Cat C175-20 ACERT single block, 20-cylinder, electronic common rail injection, quad turbocharged, air-to-air intercooled, four-stroke diesel engine powers the 797F. The power rating of the C175-20 is valid up to an elevation of or up to with a high altitude arrangement.Transmission
The 797F is equipped with a rear axle-mounted, computer-controlled, seven speed planetary transmission with an integral lock-up torque converter. Caterpillar is the only manufacturer of ultra class haul trucks to employ a hydraulic torque converter transmission. All ultra class haul trucks offered by competitors employ diesel-electric transmissions.Tires
The Caterpillar 797F uses six 59/80R63 Michelin XDR or Bridgestone V-Steel Rock Deep radial tires.Assembly
Transportation
Final assembly
Series specifications
| Specification | 797 | 797B | 797F |
| Public Introduction | 1999 | 2002 | 2008 |
| Nominal Payload Capacity | |||
| Gross Machine Operating Weight | |||
| Engine Make & Model | Cat 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 | net | net | net |
| Top Speed | |||
| Overall Height to Top of ROPS | |||
| Overall Height | |||
| Overall Length | |||
| Overall Tire Width | |||
| Fuel Capacity |