Cat introduce new C2-Series ADTs

New Caterpillar articulated dumptrucks designed to offer more power and increased payloads

CATERPILLAR have introduced their new C2-Series articulated dumptruck range, which includes the 314hp (234kW) 725C2 and the 367hp (274kW) 730C2 and 730C2 EJ with ejector-type body. Rated payloads and heaped capacities are 24 tonnes and 15 cubic metres, respectively, for the 725C2, and 28 tonnes and 16.9 cubic metres for the two larger models. Total loaded weights are 47.0 tonnes, 51.7 tonnes and 54.5 tonnes respectively.

Standard automatic traction control ensures efficient operation of all three new models, which are said to advance the design of predecessor models with increased productivity, lower operating costs, and added rimpull/retarding capability, while retaining the long-term durability, high availability, high resale value, and optimum rental margins of previous models.

Cat ACERT engines that meet or are equivalent to world emission standards (US EPA Tier 2/EU Stage II, Tier 3/Stage IIIA, or Tier 4 Final/Stage IV) are available in all three models. A diesel particulate filter and selective catalytic reduction system provide exhaust after-treatment for Tier 4 Final/Stage IV models.

The Cat 6F/1R powershift transmission electronically modulates clutch engagement pressures for smooth, positive shifts and incorporates the Caterpillar Advanced Productivity Electronic Control Strategy (APECS) system, which improves acceleration, maintains torque converter lock-up (and ground speed) during shifts, provides automatic speed holding, and modifies shift points to match operating conditions. Net benefits are said to include high productivity, optimum control, and increased fuel economy. The maximum speed of all three models is 34 miles/h (55km/h).

For controlling downhill speed, the 730C2 (pictured) and 730C2 EJ employ an engine-compression brake that provides 60% more retarding force than previous models. The 725C2 uses a fluid retarder with four operating modes. Both systems effectively manage speed and minimize service brake application for extended brake life.

All three new C2-Series models feature constant, six-wheel drive and are equipped with wet-disc clutch locks in the cross axle and inter-axle differentials. Automatic, on-the-go application of the locks is fully proportional, engaging only the required amount of lock-up to maintain traction in adverse conditions – with no input from the operator. Also new for the C2 range are all-axle wet brakes. The sealed system prevents the ingress of debris and extends brake life.

The new C2-Series models feature field-proven major structures that ensure long-term durability in severe applications. The front frame incorporates box-section longitudinal beams, and the rear frame uses a four-plate box construction to reduce stress points. The hitch retains its durable two-piece construction, using a cast-steel head bolted to a hard-wearing, forged-steel tube that maintains a tight, trouble-free connection between the frames.

Three-point, oil/nitrogen front suspension and walking-beam rear suspension effectively absorb haul road impact to allow safe, high-speed travel. The newly designed dump body, using high-strength Brinell HB450 wear-resistant steel for added resistance to impact and abrasion, features a diverging flow design that promotes clean dumping and minimizes material carryback. The body top rail design reduces material spillage in the loading area, and a fully welded front bumper and full-width belly pan provide enhanced machine protection.

The spacious two-person cab features a multi-adjustable air-suspension seat for the operator; a full-size, forward-facing seat for the trainer; tilting/telescopic steering wheel; and a convenient wrap-around dash. A multi-purpose colour display provides pertinent operating information, as well as the feed from the rear-view camera when activated.

The low, sloping hood of the new models, coupled with the operator’s central position and an extensive glass area, ensures excellent all-around visibility. Intuitive, low-effort controls contribute to safe operation and operator convenience.

Machine headlights and turn indicators (mounted wide on the machine), combined with high-mounted LED width-position marker lights, contribute to improved night-time working safety. An extensive handrail system, slip-resistant surfaces, and large, wide-angle mirrors (available in a heated version) further enhance overall safety.

To promote safe operation, the cab features integral ROPS/FOPS construction. An electro-hydraulic secondary steering system automatically activates in low-pressure situations. The park brake is spring applied and hydraulically released. External switches for fuel cut-off and electrical disconnect are easily accessible outside the machine.

An electric hood, which is raised and lowered by a switch in the cab, provides ample access to routine service points, and the rear of cab mounting of the radiator allows easy access for cleaning. The cab tilts for access to the transmission, drive shafts and hydraulic components, and an electrical service center in the cab provides a power port, diagnostic connector, and Cat Data Link connector. Extended drain intervals for engine oil and hydraulic fluid reduce maintenance costs, as do adjustment-free wheel bearings.

The optional Cat Production Measurement system brings payload weighing to the cab, helping operators work more productively and accurately. The integrated system calculates payload values using sensors located on the walking beam suspension and shows when target weight is reached, thus maximizing payloads and productivity, while reducing overloading that results in premature wear.

Part of LINK technologies, the Product Link system wirelessly connects owners to their equipment, providing access to valuable machine data such as location, hours, fuel consumption, idle time, events, and diagnostic codes for analysis and reporting via the online VisionLink user interface. LINK information assists with fact-based decision-making to help increase efficiency and reduce owning and operating costs.