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41-564: The Caterpillar D10 was the result of a need for a tractor larger than the Caterpillar D9 . At this time, competitors were building bulldozers that were more powerful than the D9. Allis Chalmers introduced at Conexpo 69 in Chicago a 524 hp (391 kW) HD-41 which was the largest crawler in the world. In 1974 after Allis Chalmers and Fiat merged their construction equipment divisions,

82-408: A 19-foot (5.8 m) U-blade, and weighed in at 180,000 lb (82,000 kg). Later versions weighed in at 190,000 lb (86,000 kg). The U-blade was 7 feet (2.1 m) high and could push 35 cu yd (27 m) according to Caterpillar's literature. The November 1977 issue of Excavating Contractor magazine had a 2-page story on the bulldozer titled "Cat Uncorks The New D10". One of

123-467: A big Caterpillar corporate meeting. Other prototypes would follow in 1975 and 1977. In March 1977, prototypes P-1 through P-10 would appear and be subsequently dispatched to different job sites. The D10 was introduced at a dealer meeting by Caterpillar in the fall of 1977. Between 1978 and 1986 nearly 1,000 D10s were made at Caterpillar's East Peoria , Illinois, plant. The D10 had sales of their Fiat-Allis / Komatsu competitive sized bulldozers combined. With

164-787: A military version of the D9 per se , but the attributes that make the D9 popular for major construction projects make it desirable for military applications, as well, and with Israeli modifications and armor , it has been particularly effective for the Israel Defense Forces and also used by KBR in Iraq. The US Army used D9 bulldozers to clear forest in the Vietnam War , but after the war, they were replaced with smaller and cheaper Caterpillar D7G bulldozers. D7G bulldozers are still very common in US combat engineering battalions, but

205-547: A series of oft-recurrent suggestions have been made to replace the lighter D7Gs with the newer and more heavily armored D9s. currently the US Army fields around 1300 D7r’s that are a combination of armored and non armored. The Caterpillar D9 have been used by the Israel Defense Forces (IDF) since it was introduced, but an armored model, with Israeli-developed vehicle armor kit, was introduced only in 1986, on

246-480: A single big black exhaust stack up front. But some engine problems came up with exhaust system routing, which resulted in two exhaust stacks up front to correct this problem. This new look took root in 1980. At the time Caterpillar's bulldozer lineup was the 62 hp (46 kW) D3, 75 hp (56 kW) D4E, 105 hp (78 kW) D5B, 140 hp (100 kW) D6D, 200 hp (150 kW) D7G, 300 hp (220 kW) D8K, and 410 hp (310 kW) D9H with

287-593: A single tooth as in the traditional system. The disadvantage is that the track moves around one more idler, reducing track life. Caterpillar claims to have alleviated this with the SALT (Sealed and Lubricated Track), a permanently lubricated track system which was introduced on their track-type tractors in the early 1970s. When the D10 was introduced in 1977, it was the most powerful track-type tractor ever built at 700 horsepower (520 kW) . The Cat D10 could be ordered with up to

328-459: A step that Caterpillar avoided for their Carrydozer machines. The Carrydozer had the structure strengthened considerably for the extra weight and the much bigger blade that it carried up front, also, the ripper was fitted with an additional counterweight block. Both D11R and D11R CD received a new Caterpillar 3508B EUI electronically controlled unit injector diesel engine with electronic controls at 915 gross hp (682 kW). The Carrydozer's weight

369-637: Is Caterpillar's largest and most powerful bulldozer. Mainly used in the mining industry, it is also employed to push-load scrapers , and rip rock overburden. D11s are manufactured in East Peoria, Illinois . The D11N was introduced in February 1986 to replace the D10 . The D11N had some major improvements over the D10: it includes a bigger track and blade, and a longer track by 21 inches (0.53 m). The U blade

410-479: Is a large track-type tractor designed and manufactured by Caterpillar Inc. It is usually sold as a bulldozer equipped with a detachable large blade and a rear ripper attachment. The D9, with 354 kW (474 hp ) of gross power and an operating weight of 49 short tons (44 t), is in the upper end of Caterpillar's track-type tractors, which range in size from the D2 69 kW (92 hp), 9 short tons (8.2 t), to

451-510: Is intended for use in loosening rocky ground and ripping out larger stones. It can also break frozen ground and excavate small ditches. The ripper can be replaced with a multi-shank ripper, allowing the bulldozer to comb the ground. 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, demolition, forestry, mining, waste, and quarry operations. Caterpillar Inc. does not manufacture

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492-608: Is just over 120 short tons (110 t) at 248,600 pounds (112,800 kg). According to Caterpillar, by the year 2000 over 3,000 D11s had been produced at their plant in East Peoria. The current D11T was introduced in early 2008 and is also 850 hp (630 kW). It comes as a regular bulldozer and a Carrydozer like the previous model. As with the D11R, the D11T Carrydozer can push 57.9 cubic yards (44.3 m ) while

533-678: Is most commonly found in use in large scale forestry, mining, and quarry operations. D11s can be adapted for agricultural and rock ripping by fitting a ripper, a long claw-like device on the back of the tractor. Rippers can come singly (single shank) or in groups of two or more (multi shank rippers). Usually, a single shank is preferred for heavy ripping. Ripping rock allows the ground surface rock to be broken into small, easy to handle and transport rubble which can then be removed so that grading can take place. Agricultural ripping allows rocky or very hard earth to be broken up so that otherwise inarable land can be used for agriculture. For example, much of

574-639: Is that the D11T has its exhaust mufflers closer to the front of the cab, similar to the D10T. They stand taller than the ones on the D11N/D11R. In November 2018, a number of enhancements were introduced and announced for the current D11T/D11T CD machines. These machines are so big that they must be partially dismantled for shipment to most sites. Some are shipped in the United States by railroad flatcars with

615-506: Is the D9T; however, older models such as the D9R, D9N, and D9L are still commonly used. The L, N, R, and T models of the D9 are visually very similar, differing primarily in the design of their internal systems. The D9L was replaced by the 520 hp (390 kW) D10N in 1987. The 370 hp (280 kW) D9N replaced D8L in 1987. The main difference between the D9T and the D9R is the installment of

656-541: The D11 698 kW (935 hp), 104 short tons (94 t). The size, durability, reliability, and low operating costs have made the D9 one of the most popular large track-type tractors in the world. The D9 is a series of heavy tracked-type tractors, carried on continuous tracks and usually used as bulldozers . The series began in 1954 with a prototype tractor called the D9X. Ten D9X prototype models were built in 1954. In 1955,

697-542: The Second Intifada (2000–2005) to demolish Palestinian structures and clear improvised explosive devices . The Israeli armor provides protection from small arms and explosives, and the bulldozers were used the Battle of Jenin 2002 during Operation Defensive Shield . A 2003 incident involving an IDF D9, in which a 23-year-old American activist was killed , resulted in a lawsuit brought against Caterpillar, Inc. in

738-617: The elevated drive sprocket , or "High Drive" system, which results in a triangular, rather than oval, shaped track . The updated version of the Komatsu, the D575A , is the world's largest production bulldozer at 168 short tons (152 t) and 1,150 hp (860 kW). A bigger machine, the Acco super bulldozer , was built by Italian firm ACCO, with twin Caterpillar diesel engines giving

779-456: The 286 hp (213 kW) D9 was introduced to compete against the more powerful Euclid TC-12. The D9 came equipped with a 1,473 cid D353, which powered the D9 until the 1980 introduction of the D9L. In 1956, the D9 had its engine power raised to 320 hp (240 kW). The new 335 hp (250 kW) D9E replaced that model in 1959. Two years later, the legendary 385 hp (287 kW) D9G

820-622: The 524 hp (391 kW) 41-B was introduced. For example, the Fiat-Allis 41-B track-type tractor had 524 hp (391 kW) at the time, while the D9H had 410 hp (310 kW). In 1976 Japanese company Komatsu came out with an even larger bulldozer called the D455A at 620 hp (460 kW) and 167,000 lb (76,000 kg). The first pilot D10 was D10X1 and was shown in July 1973 at

861-548: The D11R to be steered with small fingertip clutches on the left hand side. The D11R now weighed 230,935 lb (104,750 kg). The Carrydozer version has a special blade with a curvature that allowed 57 cy ( 43.6 m³) to be pushed. This blade design was introduced by Komatsu on their D575 A-2 dozers in 1995 as the Superdozer version. The deeper curvature of the Carrydozer/Superdozer blades literally carry

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902-580: The D9L. The IDF Caterpillar D9 armored bulldozer is operated by combat soldiers from the Combat Engineering Corps after going through a 2-month course. Many of the D9 operators are reservists and veterans, who operated heavy equipment also as civilians. The current models of the D9 employed by the IDF are the D9L, D9N, D9R, and D9T. Most of the IDF's D9 fleet today are composed of the D9R with slat armor . IDF D9 bulldozers were used during

943-424: The United States. The court dismissed the case on grounds that it was outside their jurisdiction, and that Israeli tort law was a sufficient avenue to pursue remedies. Today, the D9 is one of the main combat engineering tools of the IDF. Caterpillar D11 The Caterpillar D11T is a large bulldozer introduced by Caterpillar Inc. in 1986 to replace its D10 . Weighing 248,500 pounds (112,700 kg), it

984-519: The addition of the 700 hp (520 kW) D10. In 1986 an even larger dozer, the 770 hp (570 kW) Caterpillar D11⁣⁣N , was introduced to replace the D10. The D11 carried on the success of the elevated drive sprocket system in large bulldozers. The currently available D10T model, and preceding D10R and D10N variants, are not the original D10's successors but the D11N, D11R and the current D11T are. Caterpillar D9 The Caterpillar D9

1025-407: The back. The blade is mainly intended for earthmoving and bulk material handling: pushing up sand, soil, and rubble. It also can be used to push other heavy equipment such as earthmoving scraper pans, and in military applications, main battle tanks . The dozer blade usually has three variants: Like many other bulldozers, the D9 can be fitted with other devices, such as mine plows . The rear ripper

1066-660: The best land in the California wine country consists of old lava flows . Ripping shatters the igneous rock, allowing the growth of wine grapes. Hard earth can also be ripped and decompacted to allow the planting of orchards which otherwise could not grow on the land. The nearest direct competitor to the Caterpillar D11 is the Komatsu D475 . The Caterpillar D11 can be distinguished from the Komatsu D475 by

1107-587: The blade, push arms and ripper frame removed. Others are dismantled into several units for transport by multiple semi-trailer trucks . The dozer blade on front of the tractor usually comes in three varieties: There is also a special "Coal U-Blade", capable of carrying 74.9 cubic metres (98.0 cu yd). These are only attached to bulldozers that work solely on coal. D11s are primarily used for moving large quantities of material (dirt, rock, aggregate , soil etc.) short distances in relatively confined places. For example, they are often used in quarries. The D11

1148-487: The dirt moved, and the weight of the load increases pressure on the undercarriage and is thereby increasing the traction of the bulldozer. The increased weight on the undercarriage means also higher contact pressure between rollers and track links, which can increase wear significantly. These higher undercarriage costs must be considered when opting for a Carrydozer version. Komatsu developed a lengthened Superdozer undercarriage with two additional rollers per side to reduce wear,

1189-415: The drive axle under constant strain of the vehicle's load and terrain beneath it, was prone to frequent failure. Elevating the drive sprocket allowed for a more absorbent suspension, which provided better traction, reduced component wear and operator fatigue, and isolated the drive sprocket in a flexible section of the machine's tracks. It also allowed for the relocation of the transmission behind and beneath

1230-538: The drive sprockets out. As a result, one can pull the powershift transmission out of the rear. The 370 hp (280 kW) D9N replaced the D8 L in 1987. In 1988, Caterpillar produced their 25,000th elevated-drive-sprocket track-type tractor, a D9N. The 405 hp (302 kW) D9R replaced the D9N in 1996. The 410 hp (310 kW) D9T replaced the D9R in 2004. The D9T has a low-emissions ACERT diesel engine. The current model

1271-459: The first D10s is currently sitting in front of the East Peoria, Ill plant where it was made. A picture of this D10 can be found on pages of a book titled "The Caterpillar Century" on pages 298-297. Caterpillar put the 1,786 cid V-12 twin turbocharged D348 in the D10 to power it. This had already proven itself in the 777 off-highway hauler and the 550 hp (410 kW) 10 yards (9.1 m) 992/992B wheel loaders from 1968 on. The early D10s came with

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1312-519: The first SxS D9G, which has two D9Gs side-by-side, pushing a 24-foot (7.3 m)-wide bulldozer blade. In 1969, Caterpillar introduced this new SxS D9G. In 1974, the improved 410 hp (310 kW) D9H was introduced to replace the D9G. The D9H is still the most powerful conventional track-type tractor in company history. The DD9H and the SxS D9H soon followed. In 1980, the 460 hp (340 kW) D9L

1353-697: The introduction of the N-Series tractors in 1986-87 their model numbers were pushed up, resulting in the D9N replacing the D8L, the D10N replacing the D9L, and the new D11N replacing the D10. The D10 was large enough to do about 50 percent more production than the D9H. Among modern tractors, the High Drive (elevated sprocket) design was unique to Caterpillar products. The concept originated in 1914 with Caterpillar predecessor C. L. Best Tractor's 30 Humpback; this tractor

1394-553: The new Cat C18 ACERT inline-six engine in the D9T vs the V8 3408 HEUI in the D9R. The D9R has clutch and brake steering, while the D9T has differential steering. The D9L is the most powerful D9 in history, with a flywheel power of 460 hp (340 kW). The D9L is also the heaviest D9 in history at 130,000 pounds (59,000 kg). The D9's primary working tools are the blade, affixed to the front and controlled by four hydraulic cylinders, and an optional ripper , which can be attached to

1435-403: The operator, providing better weight distribution and improved traction, and permitting more compact location of both the blade and rear implements. The high-drive system also eliminates the traditional geared final drive in favor of a modular system employing a hydraulic planetary final drive, which withstands engine torque better, since it distributes the forces over multiple gear teeth instead of

1476-617: The regular D11T can push 45 cubic yards (34 m ) of earth. A new D11T was on display at the Caterpillar display at Minexpo during the 22 to 24 September 2008 expo in Las Vegas, Nevada. The D11T and D11T CD are both powered by the CAT C32 engine with ACERT technology. The D11R and the D11T differ in the configuration and layout of their operator controls; several levers have been changed into electronic switches, and several controls have been moved for increased visibility. Another difference

1517-610: Was added to the D11N which raised the weight up to 225,950 lb (102,490 kg). This would become known as the D11N Impact Ripper. The D11R and D11R Carrydozer were introduced in Las Vegas, Nevada , at MINExpo International in 1996. Both were 770 hp (570 kW) and that would be increased to 850 hp (630 kW) later in 1997. Other improvements made to the D11R were fingertip controls and electronic clutch and brakes. The finger tip controls (FTC) allowed

1558-492: Was discontinued a year later, and the only other tractor to use the concept until the D10's introduction was the Cletrac Model F, built between 1920 and 1922. The elevated sprocket system was first applied to a 10-machine test run of the D10 in 1977. It separated the suspension from the tractor's drive train, dramatically reducing stress on both and increasing their durability. Prior to this, the combined system, which put

1599-400: Was introduced. The unit featured the same new type of elevated drive sprocket undercarriage as had been introduced on the larger D10 in 1977. The new undercarriage design reduced strain and shock loads on the final drives and gave the "belly pan" more ground clearance. The elevated-drive-sprocket undercarriage is a modular design. To repair the machines, one breaks down the tracks and pulls

1640-426: Was introduced; it remained in production for 13 years; it became the main crawler on many job sites, testifying to its sturdiness and design. In 1965, West Coast businessman Buster Peterson hooked up a pair of D9Gs to pushload the largest wheel tractor scrapers built. In 1968, Caterpillar bought the rights to this concept, thus the 770 hp (570 kW) DD9G was created (DD stands for Dual D9G). Peterson also built

1681-430: Was just under 21 feet (6.4 m) wide and 7 feet (2.1 m) high. This increased the blade capacity to 45 cu yd (34 m ). The D11N's weight was 204,517 pounds (92,767 kg). It was powered by a 770 horsepower (570 kW), 2,105 cu in (34.49 L) 3508 V-8 diesel engine. The D11N's improvements made it over 10 percent more productive than the D10. In 1987 a hydraulically powered impact ripper

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