CAT Dumper

Caterpillar Dumper

Hisory of Caterpillar
The story of Caterpillar Inc. originates in the late 19th century, when Daniel Best and Benjamin Holt experimented with ways to fulfill the promise that steam tractors held for farming. By 1904, these large steam-powered tractors had been plowing California fields for 14 years, and occasionally got bogged down in the soft soil, especially after heavy rains. Once stuck in the mire, they were difficult to pull free, even with teams of horses. Their great weight typically rested on four metal wheels.
One solution employed to alleviate this problem was to lay a temporary plank road ahead of the steam tractor, but this was time-consuming, expensive, and interfered with earthmoving. Holt came up with the idea to carry the road with the vehicle. On November 24, 1904 he added wooden block-linked treads around the idlers on Holt No.77, his test tractor. The results were impressive, and the modern tractor was born. Caterpillar became famous for its Caterpillar 30 and its Caterpillar 60 tractors.
In 1909, Benjamin Holt bought the abandoned but relatively new manufacturing plant of a tractor company that had failed in East Peoria, Illinois. The location offered Holt everything he needed in a manufacturing center, and despite the hefty amount of capital needed for retooling the plant, the venture proved so profitable that by 1911 the factory employed 625 people. Around that time, Holt Manufacturing began exporting its tractors to Argentina, Mexico, and Canada, in addition to their domestic sales. The Holt Manufacturing Company later pioneered the use of the continuous track during World War I. Their crawler tractors inspired the first military tanks, which helped end World War I.

Caterpillar 740 Articulated Dumper

Articulated-Dumper-CAT

Articulated-Dumper-CAT

The Caterpillar 740 Ejector Articulated Truck is Caterpillar’s second generation of articulated haul truck (dump truck) to have a system that pushes material out the back of the body. It is the largest articulated haul truck offered by Caterpillar; larger trucks use a rigid frame system. The ejector uses a 4 cylinder hydraulic ram and blade to dump the material out, a similar system to Cat’s wheel tractor-scrapers. The 740 Ejector is sold as separate model from the usual 740.
Total power is 436 hp (325 kW), total operating weight is 162,280 lb (73,610 kg), with the load being 42 short tons (38 tonnes), 37.3 yd³ (28.5 m³) at a 1:1 heap. Top forward speed is 34 mph (55 km/h).

Caterpillar 797B

Caterpillar developed the 797 for the growing tar sands industry. When then former Cat CEO Glen Barton was asked what was the development for the 797 he gave this answer: “tar sands”. In the tar sands area companies like Syncrude, Suncor and Albian have bought many Caterpillar 797s since its introduction. Today the 797/797B/797F is operating in places like Chile, Australia, Indonesia, Canadian Tar Sands and the Powder River Basin area of north-eastern Wyoming and south-eastern Montana.

The engine in the 797/797B is a 3524B which costs $600,000 and is made at Caterpillar’s LEC (Large Engine Center) in Lafayette, Indiana. This particular engine is basically a pair of 3512 diesel engines hooked up to form the 24 cylinder 3524B. The 3512 has powered the 150 ton 785, 785B and the 785C since its introduction in late 1984. It is 3,158 cubic inches and is a V-12 diesel. During MINExpo International in Las Vegas, Nevada Caterpillar introduced a new 797F off-highway hauler. This has the C175 diesel which is 4,000hp and 6,469 cid which replaced the 3524B in the 797B. The 797 is equipped with a torque converter transmission coupled to a seven speed planetary gearset gearbox (plus reverse) which is controlled by a computer. The engine delivers the power to a torque converter which is attatched to its rear. Then, the drive is transmitted down a propellor shaft to the rear axle/gearbox unit. The gearbox, differential and axle all form one unit.In common with most large trucks, the axle has reduction gearing within each wheel hub to further reduce the speed of the drive to the wheels.

This gearbox configuration is the same as used on an automatic gearbox in passenger cars, except that in passenger vehicles the torque converter and planetary gearbox are a single unit, attatched to the rear of the engine. Designing the axle and gearbox as a single unit and the torque converter separate, is unusual and takes place only where circumstance dictates.

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