A tracked loader or crawler loader is an

engineering vehicle Heavy equipment or heavy machinery refers to heavy-duty vehicles specially designed to execute construction tasks, most frequently involving earthwork operations or other large construction tasks. ''Heavy equipment'' usually comprises five e ...

consisting of a tracked chassis with a

loader Loader can refer to: * Loader (equipment) * Loader (computing) ** LOADER.EXE, an auto-start program loader optionally used in the startup process of Microsoft Windows ME * Loader (surname) * Fast loader * Speedloader * Boot loader ** LOADER.COM ...

for digging and loading material. The history of tracked loaders can be defined by three evolutions of their design. Each of these evolutions made the tracked loader a more viable and versatile tool in the excavation industry. These machines are capable in nearly every task, but master of none. A

bulldozer A bulldozer or dozer (also called a crawler) is a large, motorized machine equipped with a metal blade to the front for pushing material: soil, sand, snow, rubble, or rock during construction work. It travels most commonly on continuous track ...

excavator Excavators are heavy construction equipment consisting of a boom, dipper (or stick), bucket and cab on a rotating platform known as the "house". The house sits atop an undercarriage with tracks or wheels. They are a natural progression fro ...

, or wheel loader will outperform a tracked loader under a set of conditions, but the ability of a tracked loader to perform almost every task on a job site is why it remains a part of many companies' fleets. The first tracked loaders were built from track

tractor A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery such as that used in agriculture, mining or construction. Most common ...

s with scratch-built loaders. The first loaders were cable-operated like the

s of the era. These tracked loaders lacked the ability to dig in hard ground, but so did the bulldozers of the day. They were mostly used for moving stockpiled material and loading trucks and rail cars. The first major design change to tracked loaders came with the integration of

hydraulic Hydraulics (from Greek: Υδραυλική) is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counter ...

systems. Using hydraulics to power the loader linkages increased the power of the loader. More importantly, the loaders could apply down pressure to the bucket, vastly increasing their ability to dig compacted ground. Most of the tracked loaders were still based on a

equivalent. The weight of the engine was still on the front half of the tracks along with the heavy loader components. This caused many problems with heavy wear of the front idler wheels and the undercarriage in general. The Caterpillar 983 tracked loader, the second largest tracked loader ever built, was notorious for heavy undercarriage wear. The hydrostatic drive system was the second major innovation to affect the design of tracked loaders. Tracked loaders have become sophisticated machines, using hydrostatic transmissions and electro-hydraulic controls to increase efficiency. Until the rise in popularity of

s, tracked loaders had little competition with regard to digging and loading jobs.

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{{Commons category-inline, Tracked loaders Engineering vehicles

See also

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