The compact hydraulic excavator can be a tracked or wheeled vehicle with an approximate operating weight of 13,300 pounds. Normally, it includes a standard backfill blade and features an independent boom swing. The compact hydraulic excavator is also known as a mini excavator. A compact hydraulic excavator is different from other types of heavy machinery in the sense that all movement and functions of the machine are accomplished through the transfer of hydraulic fluid. The work group and blade are activated by hydraulic fluid acting upon hydraulic cylinders. The rotation and travel functions are also activated by hydraulic fluid powering hydraulic motors. Most types of compact hydraulic excavators have three assemblies - house, undercarriage, and the work group.

 The undercarriage of compact excavators consists of rubber or steel tracks, drive sprockets, rollers, idlers, and associated components and structures. The undercarriage is also home to the house structure and the work group. The work group consists of the boom, dipper or arm, and attachment. It is connected to the front of the house structure via a swinging frame that allows the work group to be hydraulically pivoted left or right in order to achieve offset digging for trenching parallel with the tracks.

 The purpose of the boom swing is for offset digging around obstacles or along foundations, walls, and forms. Another use is for cycling in areas that are too narrow for cab rotation. Another major advantage of the compact excavator is the independent boom swing. The backfill blade on compact excavators are used for grading, leveling, backfilling, trenching, and general dozer work. The blade can also be used to increase the dumping height and digging depth depending on it’s position in relation to the workgroup.

 The most common place you’ll find compact excavators is in residential dwellings. When digging phone lines or other things, these pieces of equipment are very common for getting between houses. Due to their small size, they can fit almost anywhere. Over the years, the capabilities for compact excavators have expanded far beyond the tasks of excavation. With hydraulic powered attachments such as breakers, clamps, compactors and augers, the compact excavator is used with many other applications and serves as an effective attachment tool as well. Serving many purposes, the compact excavator is a great addition to any job that requires the use of machinery.

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The backhoe loader is one of the most common pieces of heavy equipment on any size job site. The fact that it features two useful tools in one machine makes the backhoe loader a must-have for all kinds of construction and repair projects.

The standard backhoe consists of a diesel-powered, four-wheeled vehicle with the operator’s cab in the middle and a tool on each end. On the front, it has a loader: a wide bucket on dual arms that is used to either pick up loose piles of material or to push dirt back into a hole when a job is finished. The rear end has a backhoe — a hydraulic-powered digging scoop on a three-jointed arm, designed to dig through hard earth. The operator needs only to turn around in his seat to switch from digging a hole to filling it back up.

Digging and refilling holes and trenches is commonly required for all kinds of construction, utility work, and landscaping. The ability to exchange the backhoe or loader bucket for a different attachment gives you even more flexibility: crushers, retractable-bottom buckets, grinders, and other tools can handle a variety of other tasks. The combination of power, relatively small size, two common tools, and flexibility makes backhoe loaders extremely useful for contractors and construction firms of many types.

This BuyerZone Backhoe Loaders Buyer’s Guide will explain what you should look for when choosing a backhoe loader, what features to expect, and how much you can expect to pay.

Part of backhoe loaders’ popularity is based on the fact that they fall in the middle of a range of digging and loading equipment, bringing more power than compact machines without the expense of full-sized excavators. You should consider whether a backhoe loader is the right choice for the bulk of your digging and earthmoving needs.

For smaller jobs and increased flexibility, the combination of a skid steer loader with a standard bucket and a mini excavator can sometimes work faster than a backhoe loader. It can be cheaper to buy the two smaller machines than one backhoe loader, but you’ll need an operator for each one and you’ll have more transportation and maintenance hassles. These mini machines are most valuable in very crowded conditions, and recent trends have many contractors replacing at least one backhoe with a mini excavator.

For high-end digging power, full sized excavators are the best choice. These massive tracked machines are only worthwhile if your application calls for ongoing digging: building foundations, for example. However, their size makes them less useful on cramped construction sites.

Backhoe loaders fill a very important middle ground, where having an excavator and loading bucket on one relatively compact machine is essential. They’re also much better at moving around large job sites or between sites — you can drive a backhoe on the road if need be, while excavators and skid steers have to be moved on trailers.

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Changsha Zoomlion Industry Science and Technology Development 000157.SZ, a major Chinese heavy machinery maker, said on Tuesday it expects to post a 150-200 percent growth in its 2007 net profit on robust sales.

The prediction was substantially higher than the forecast it made in October, when the firm expected its net profit to grow 100-150 percent year on year in 2007 from 480.9 million yuan ($66.47 million) in 2006, Zoomlion said.

In a filing with the Shenzhen stock exchange, the company attributed the expected earnings surge to a substantial increase in the sale of its core products.

Detailed figures will be announced in its annual report to be released by April 1.

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Siemens announced it was forming a joint venture with Russian heavy machine maker Uralmash for constructing plant for the Russian metals and mining industries. The German engineering concern announced at its Munich headquarters it was to take a majority stake through its subsidiary, VAI Metals Technologies, of 50 per cent plus one share in the new company.

Uralmash, based in Yekaterinburg, makes heavy machinery for the Russian mining, metallurgical and electricity production sectors.

Siemens has long held a blocking minority in the Russian company Power Machines, but has been prevented by the Russian authorities from taking a controlling stake.

Earlier this month, Siemens announced it had secured a contract from Power Machines for the supply of components for the Urengoiskaya and Kirishi projects in Russia.

The German company sees itself as “market leader in Russia in the field of gas turbine technology.”

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