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Caterpillar launch three new ADTs

Cat 735 articulated dumptruck

Design refinements address operator safety and convenience, enhanced control, and powertrain advances

CATERPILLAR have launched three new articulated dumptrucks, the 730, 730 EJ (ejector) and 735, all of which have been extensively redesigned to enhance the field-proven features and performance of their C-Series predecessors (the 730C2, 730C2 EJ, and 735C) with new operator stations – including innovative new controls, transmission-protection features, a new hoist-assist system, an advanced traction-control system, a new stability-assist system, and a fuel-saving ECO operating mode.

In addition, the new 730 and 730 EJ have been enhanced with automatic retarder control and a hill-start feature. The 735 retains these features from its C-Series predecessor and further incorporates significant design refinements, including a new Cat C13 ACERT engine, Cat CX31 transmission (also on the 730 and 730 EJ) and structural and dimensional modifications that reduce empty weight by 22%, whilst retaining the productivity of the outgoing 735C and delivering a gain in fuel efficiency of up to 19%.

The cab’s new external ‘spinal-ROPS’ design incorporates a rear-quarter glass that eliminates a structural pillar in the C-Series design, for enhanced rear visibility. Also, a new ‘wake-up’ feature initiates the machine’s displays when the door is opened, whilst he door itself is of a lighter, stronger design with a shut-assist feature for improved sealing against dust infiltration. The overall cab design is said to result in an interior sound level of 72dB(A), representing a 7dB(A) reduction compared with previous models.

Optional new infrared glass reduces solar heating inside the cab, and left- and right-hand sliding windows increase ventilation and facilitate communication with workers and the loading-vehicle operator. A new, automatic climate-control (HVAC) system positions more vents above and behind the operator for increased heating and cooling efficiency, whilst a new heated/cooled seat allows operators to ‘dial in’ personal comfort settings.

For added safety, a new lighting system, controlled via a ground-level switch, illuminates the cab’s entry steps and hitch area. Optional integrated payload lights provide an external indication of payload levels for the loader operator, and optional long-range LED work lights improve visibility at night or in situations of reduced visibility. New cab-mounted mirrors, including a front-visibility mirror, enhance all-around vision for the operator.

The optional Cat Connect PAYLOAD technology calculates payload via sensors on the walking-beam suspension, whilst load-status lights at all four corners of the cab roof ensure visibility to the loader operator from any angle. In addition, the standard Cat Detect/Stability-Assist system monitors the working angle of the tractor and body, as well as the grade, and warns the operator if the machine is approaching the set threshold angle, stopping the dump process if continued action may result in potential tipping.

Further enhancing safe operation is the Cat Advanced Automatic Traction Control system, which features refined technology for proactively applying differential locks to avoid wheel spin. Also, a ‘terrain-based’ throttle-smoothing system prevents acceleration surges when travel over particularly rough terrain makes it difficult for the operator to keep a steady pressure on the throttle pedal.

A new combined transmission and hoist lever provides efficient, single-lever control of vehicle speed and body-hoisting functions to reduce operator effort and to automate repetitive operations. A switch in the cab allows operators to choose either manual or assisted hoisting control, the latter selection automatically applying the waiting brake, shifting the transmission to neutral and raising the body to maximum angle at high engine idle. Assisted hoisting returns the body to the lower position at the flick of a switch. Both raise and lower functions feature automatic cushioning and speed reduction at the limits of movement.

New buttons in the combined transmission and hoist lever allow the setting (limiting) of machine speed and selection of the transmission waiting brake. In addition, a new shift-protection system brings the truck to a safe stop if a directional shift is made while the truck is moving. The new combined shifting/hoisting lever also incorporates a parking position, and a tertiary brake switch sets the parking brake in the unlikely event of main and secondary braking malfunction.

The new 32-tonne capacity 735 replaces the Cat C15 ACERT engine, rated at 441hp, with the Cat C13 ACERT, rated at 428hp (319kW), whilst the new 28-tonne capacity 730 and 730 EJ continue to use the Cat C13 ACERT engine, rated at 367hp (274kW). The C13 engine used in all the new trucks is available in configurations to meet the emissions standards of both highly regulated and less-regulated countries.

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