Some new small and medium excavators

Published 30/6 at 14:41

It is not only demolition robots that are suitable for wrecking in confined areas. Here are some new mini and midi excavators on the market.

 Cat’s Next Generation 

The new Cat 360 CR Next Generation mini hydraulic excavator marks Caterpillar’s entry in the 6t class offering. It shares a similar controls layout and common components with the full line of Cat Next Generation mini excavators to simplify training, offer quick adaptation for operation and lower owning/operating costs. With its long stick option, the 306 CR delivers a maximum dig depth of 4,110mm and 7,175kg maximum operating weight when equipped with the sealed and pressurised cab. A canopy alternative to the pressurised cab will be available in 2020. Built with a swing boom, this mini excavator’s compact radius design provides a low, 1,475mm tail swing with counterweight for working close to obstructions.

The 306 CR delivers lift performance of up to 3,555 kg at a 3m radius, as well as enhanced uphill swing torque and increased cycle times. The fuel-saving, load-sensing hydraulic system with an electronically controlled variable-displacement piston pump generates 151l/min hydraulic oil flow. According to Caterpillar, it offers hydraulic capacity for increased travel performance and higher digging forces than competitive units. High flow rate of 90l/min to the auxiliary circuit enables operation of more demanding hydromechanical attachments. Complete with quick-disconnect lines, the standard auxiliary hydraulic system provides one-way, two-way and continuous flow. The Cat C2.4 turbo diesel engine rated at 41.7kW (55.9 net hp) powers the new 306 CR mini excavator and meets EU Stage V emission standards. It features a power-dense design and delivers consistent performance through a wide speed range. Automatic engine idle and shutdown features help to save on fuel consumption.

The design emphasizes operator comfort, convenience and safety. Its sealed and pressurised cabin lowers in-cab operating noise levels to 72 dB(A) and is heated and air-conditioned. The cab features a roll over-protective structure, tip over protective structure, and top guard. Offering the ability to set personal operating preferences, new LCD monitor provides easy-to-read machine information, jog-dial for simple navigation and standard Bluetooth capability. The colour monitor gives the operator critical operating details such as fuel, coolant temperature and hour meter. The operator can switch from conventional lever/foot-pedal steering controls to the Stick Steer system. The intuitive pattern changer allows operators to select their preferred joystick movement for controlling the 306 CR. Straight blade, angled blade and extra tool carrier (XTC) configurations expand the flexibility of the 306 CR. Featuring ample travel, above and below grade operation and float function, the blade handles loose material in backfilling and grading applications. Delivering the precision required when digging around utilities, front shovel operation can be accomplished with both pin-on and coupler-mounted buckets.

The 306 CR shares common components with models in the Cat mini excavator line to lower repair cost, decrease service time and reduce repair parts inventory. Recessed to protect from damage in the field, robust flat side panels offer long service life and quick replacement to lower owning and operating costs. Ground-level access to maintenance checkpoints offers convenient access, while enhancing worker safety. Industry-leading grease intervals help to shorten the daily service routine. Extended filter service life means the 306 CR spends less time in the service shop for routine maintenance.

Another new product from Caterpillar is their TiltRotate System (TRS) for Cat Next Gen mini excavators. The new TRS6 and TRS8 models allow attached work tools (including buckets, forks, grapples, brooms, and compactors) to rotate 360 degrees and tilt 40 degrees side-to-side, enabling the machine to reach more work areas from a single position, while maneuvering tools over, under, and around obstructions when excavating, grading ditches, sorting recycle materials, or placing pipe. The TRS multiply the mini excavator’s versatility and are available in various configurations to match the application. TRS models have two interfaces: a top interface that connects the TRS to the carrier machine; and a bottom interface that connects various work tools to the TRS. The four configurations for the TRS6 allow the user to choose between an S-Type hydraulic-coupler or pin-on top interface, and, whether the TRS is equipped with an integral grapple (which can be used with a work tool attached). All TRS6 models use an S-Type hydraulic coupler for the bottom interface. The four configurations for the model TRS8 allow selecting an S-Type coupler for both the top and bottom interfaces, or, a pin-on top interface and pin-grabber coupler bottom interface, and whether the TRS has an integral grapple. The pin-on/pin-grabber configuration is not available with the integral grapple.

The compact design of the TRS6 and TRS8 models allow the mini excavator to maintain high digging forces, and a reinforced gearbox with a specially designed bearing ring distributes working forces to reduce stress on the TRS and the host machine. Also, a no-maintenance lubrication system for the rotation system distributes heat. The high-torque rotation system quickly positions work tools, and an integral self-locking mechanism enables digging at any angle required. A single grease point on TRS8 models provides grease to all joints requiring lubrication. The double-acting tilt cylinder has integrated load-hold valves that sustain holding pressures and prevent cylinder movement under load. The cylinder also features hardened pistons and maintenance-free bearings, and its scratch-resistant, rust-proof surfaces require no maintenance. An integrated, dealer-installed field control kit, which includes specially designed joysticks, suits all boom-and-stick combinations and provides intuitive control of the TRS and integral grapple. The TRS monitor informs the operator of the attachment’s position, and an engagement/disengagement sensor assures that work tools are secured via a safety locking mechanism with an indicator. A bucket-shake feature for TRS8 models, activated by a joystick button, facilitates even spreading of materials. TRS6 models are designed for the Cat 306 CR mini excavator. TRS8 models using the S-Type coupler for both top and bottom interfaces fit models 307.5, 308, 308.5, 309 and 310. One of the two remaining TRS8 models, using the pin-on/pin-grabber interfaces, is designed for the 307.5, 308, 308.5 and 309; the other is designed for the 310.


 Crawler skid-excavators from Mecalac 

Mecalac, a global leader in the design, manufacture and distribution of compact construction equipment for urban environments, introduced its innovative line of crawler skid-excavators : the newly updated MCR Series. Comprised of three models, the 6MCR, 8MCR and 10MCR, respectively 6, 8 and 10t, the Mecalac’s line offers speed, productivity and compact operation. Our MCR excavators can go up to 10km/h to help you eliminate non-added value from your jobsite. Reducing traveling times compared to other excavators translates into more productivity, optimization of your fleet and a better utilization rate of your machine. If you need to travel a long distance, or simply if you prefer, you can drive your machine with the left joystick. MCR excavators can work efficiently with full-size loader buckets. For instance, the 8MCR maximum bucket capacity equals 0.53m³, the same bucket size as a 12t excavator. The 10MCR can handle a 0.75m³ bucket. That means +77%m³ moved at once compared to traditional excavators. Plus loader buckets allow you to spread material or fine grade ground level in one pass only, without the need to swing or move the boom.

An 8MCR features a total swing radius of 2,698mm; this equals the total radius of a typical 2t excavator. MCR excavators offer a true 360° compact radius, not only to the rear 1254mm, but also to the front 1444mm. Which ever option you choose, you’ll get a spacious cab, with generous legroom and optimum visibility. An MCR excavator can perform quick and precise trench digging, close to a wall or parallel to the machine, lift loads, lay pallets over an obstacle or below grade, and bring solutions to complex jobsite conditions and logistics. The patented Mecalac boom folds 130° backwards to offer stability, acting as a natural counterweight. MCR excavators can lift 40% of their own weight. They are the only compact units with the boom mounted at the side of the cab, not at the front. In addition, the kinematics allow you to operate close to the machine while still offering great reach.

The 6MCR model is available with 2 piece-boom. This configuration translate into the optimum solution for basic digging/truck loading applications, according to Mecalac. Thanks to the main selector, the operator can control and use the excavator like a loader. The MCR Series excavators are able to use skid and loader buckets in the reversed position. This means you can push and load much bigger volumes. The bucket is supported against the blade so that the force of the thrust is transmitted directly from the undercarriage to the bucket. Mecalac MCR excavators boast a number of fuel saving features including automatic low idle, automatic engine shutdown or a fan on-demand. There are also wider solutions, like optimizing machine utilization rate. Having a machine that can carry out the work of two different products – a traditional skid-steer and a compact excavator – allows you to replace them with just one machine on the jobsite.

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