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| Caterpillar D9 - General Characteristics | |
| Engineering vehicle type: | Heavy bulldozer |
| Propulsion: | Caterpillar tracks |
| Engine model: | 3408 HEUI (D9R) |
| Gross power: | 354 kW (474 hp) D9R |
| Flywheel power: | 306 kW (410 hp) D9R 280 kW (375 hp) D9N 343 kW (460 hp) D9L |
| Operation Weight: | 48784 kg (107548 lb) | Length: | 8.1 m |
| Width: | 4 m (blade) |
| Height: | 4 m |
| Speed: | 11.9 km/h (foward) 14.7 km/h (reverse) |
| Blade capacity: | 13.5 m³ (17.7 yd³) 9 SU blade 16.4 m3(21.4 yd³) 9 U blade |
The Caterpillar D9 is a large track-type tractor (commonly referred to as a bulldozer) with caterpillar tracks designed and manufactured by Caterpillar Inc.. The D9, with 354 kW (474 hp) of gross power and an operating weight of 49 tons, is in the upper end, but not the heaviest, of Caterpillar's track-type tractors, which range in size from the D3 57 kW (77 hp), 8 tons, to the D11 698 kW (935 hp), 104 tons. The size, durability, reliability, and low operating costs has made the D9 one of the most popular large track-type tractors in the world, with the Komatsu D275A as one of its most direct competitors. The D9 recently gained high media attention due to its military applications by the Israeli Defence Forces.
The D9 is a series of heavy tracked-type tractors, propelled by Caterpillar tracks and usually used as bulldozers. The D9 has undergone several generations of engineering enhancements. Each new generation is denoted with an English letter added to "D9". Until the introducing of the D10 in the 1980's, the D9 was the larget conventional CAT dozer. The D9L was the first variation of the D9 to employ "high drive" design in which the driving wheel is located above the track wheels, and not in the same row. The current version is the D9R but the older models such as the D9N and D9L are still common. The L, N and R models of the D9 are visually very similar, differing primarily in the design of their internal systems.
The D9's primary working tools are the blade, affixed to the front and controlled by 6 hydraulic arms, and the optional ripperRipper is a proposed spin-off series from Buffy the Vampire Slayer starring Anthony Stewart Head as Rupert Giles. As of May 2003, nothing is certain about the series yet, other than a confirmation by creator Joss Whedon that he is working on plans for the, which can be attached to the back. The blade is mainly intended for earthmoving and bulk material handling: pushing up sand, dirt and rubble. It also can be used to push other heavy equipment such as earthmoving scraper pans, and in military applications, main battle tanks. Like many other bulldozers, the D9 can be fitted with different blades (such as size-9 SU blade and Universal blade ) or other devices such as mineplowA landmine is a type of mine which is placed on the ground and explodes when triggered by a vehicle or person. Landmines are used to secure disputed borders and to restrict enemy movement in times of war. Because of this, and also because not all types ars or combine harvesterThe combine harvester or simply combine is a machine that harvests, threshes, and cleans grain plants. The desired result is the seed (such as canola or flax) or grain (such as oats, wheat, or rye); a byproduct is loose straw, the remaining husk of the pl. The rear ripper is intended for use in loosening rocky ground and ripping out larger stones. It can also break frozen ground and excavate small ditches.
The size, power and weight of the larger track-type tractors dictate that they are used primarily for major projects. The D9 is most commonly found in use in construction, forestry, mining, waste, and quarry operations.
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