Unveiled by Terex in February, the TA300, which replaces the TA30 that was launched in 2002, is at press the only articulated dump truck (ADT) in the 30-t (33-ton) market that has a fully independent front suspension (IFS) as standard. IFS is optional on Volvo and Bell ADTs and not available from other OEMs.
The IFS system with its double wishbone design makes the ADT easier to handle for the operator when traveling over severe terrain, contributing to increased productivity with quicker haul cycles. Shock loads and vibrations are also lessened via the IFS, increasing component life and enhancing operator comfort to help reduce driver fatigue.
A 10.8-L Cummins QSM11 offers the TA300 287 kW (385 hp) at 1800 rpm and 1775 N·m (1309 lb·ft) at 1400 rpm, for the highest power and torque in the 30-t (33-ton) ADT class, says Terex. This performance, coupled with the 100% differential locking action, enable the maneuverability and tractive effort necessary for such diverse applications as quarrying, mining, construction, and road maintenance. The engine's power and torque curves were specifically designed for such applications.
Its ZF 6WG 310 RPC fully automatic transmission also features manual override. Its torque converter is close-coupled to a countershaft gearbox. A torque-proportioning output differential transmits drive to the front and rear axles. The differential may be locked by the operator for difficult traction conditions.
With a 17.5-m3 (618-ft3) capacity, the bed can be customized to maximize production and durability through options such as liner plates, side extensions, and a tailgate. It has a maximum payload of 28 t (31 ton) and a 20-s dump cycle. Constructed of steel with a 1000-MPa (145,000-psi) yield strength, the bed's floor and tailchute plate thickness is 14 mm (0.55 in) and the sides are 12 mm (0.47 in) thick.
All Terex ADTs, including the 6x6 TA300, have oil-cooled multiple-disc brakes on each axle, which provide extended brake component life, reduce service intervals and operating costs, and improve overall braking performance in comparison to traditional dry-disc brake systems fitted as standard by other leading manufacturers, says Terex. Service brake life is further increased by the use of a Jacobs compression-release engine brake for retardation. A hydraulic transmission retarder is available as an option.
Control positions and instrument groupings in the new TA300 ergonomic cab were designed according to operator feedback. The ROPS/FOPS cab also features reduced interior noise levels, an improved steering wheel, more effective air-conditioning, a high-quality sound system, and new mirrors. Interior aesthetics have been updated to anthracite grey with a matte finish to reduce glare and improve durability.
The wide opening angle of the hood and ground level access to the major components allow for more convenient servicing of the TA300. Mechanics can easily complete under-hood service due to the wide platforms on both sides of the engine.
A couple months prior to the launch of the TA300, Terex launched the 40-t (44-ton) TA400 as a replacement for the TA40. Terex says it was developed to keep productivity high and fuel consumption low while providing total comfort and control for the operator.
As with the TA300, the TA400 was given a new hood and grille design, and the interior was updated. Key operating switches were moved to the right-hand side of the dashboard within easier reach of the driver. Interior cab noise levels were reduced, and a new style of mirror increased visibility over its predecessor.
The TA400 is powered by a 14-L MTU/Detroit Diesel Series 60 that offers 336 kW (450 hp) at 2100 rpm and 2100 N·m (1548 lb·ft) at 1350 rpm. It has an extended engine oil service interval to help lower the cost of ownership. It uses an Allison HD4560 fully automatic transmission with planetary gearing.