DOOSAN Infracore Construction Equipment, an industry leader in the engineering, manufacturing, and marketing of compact and heavy construction equipment, is launching a new range of wheel loaders for markets in the Middle East.

Building on the design of the previous Mega range, the new Doosan DL250A, DL300A and DL420A wheel loaders are powered by Doosan Tiers One and Two diesel engines that are suited for use in the Middle East. The DL250A wheel loader will be exhibited at the Intermat 2012, an international exhibition for construction equipment and techniques being held in Paris, France, this month (April 16 to 21).

All the new models offer several improvements for better performance, greater operator comfort, easier handling and serviceability, as well as increased durability, says a spokesman for Doosan.

The new wheel loaders feature new versions of the ZF axles previously used on the Mega models. The DL250A features the MT-L3085 version II axle in the front and the MT-L3075 II axle at the rear. The MT-L3085 II is used for the rear axle on the DL300A with the ZF MT-L3095 II axle on the front. The latter is also used for the rear axle on the new DL420A, while the ZF MT-L3105 II axle is on the front. “All axles are equipped with a new breather system intended to prevent clogging from dust and sand, which can raise the temperature of the axle oil and damage seals on the axles,” says the spokesman.

With bucket capacities ranging from 2.5 to 4.5 cu m, the new DLA wheel loaders are intended to meet a variety of material-handling needs from loading and transporting granular material (such as sand and gravel) to industrial, mining and quarrying applications.

The width of both the lift arm and the tilt lever on the DL250A wheel loader have been increased, resulting in a larger front working range with an increased dump height of 2,865 mm at the 50-degree maximum tilt angle. All three models offer higher static tipping loads at maximum reach with a straight frame – 11,000 kg (DL250A); 14,500 kg (DL300A); and 18,400 kg (DL420A).

Meanwhile, to increase quality and reliability, new O-ring faced seal pipes and hoses in the loader hydraulic systems have been combined with new materials and high class components such as the Hydraforce LIS valve. A completely new steering unit in the DL250A model and an improved steering amplifier and accumulator in the DL300A and DL420A enable smoother steering.

To ensure industry-leading operator comfort, the loaders have new ROPS/FOPS-certified cab offering a combination of increased space (six per cent more volume in the DL250A and 11 per cent more in the DL300A/DL420A models); better visibility due to a wider front glass section; better air-conditioning with a 30 per cent increase in air nozzles; a new instrument panel; a new layout for controls and switches and improved storage areas.

“The new cab design is complemented by better protection for the machine and operator, thanks to larger mud guards, new metal grilles, new fenders, improved hand-rail and step designs and a new roof cover,” adds the spokesman.

Maintenance and servicing of all three models is also easy. In the DL250A, the radiator grille opens wider for better access, while the swing-out fan on the DL300A and DL420A also simplifies maintenance. The DL250A also features a new cooler system while, in all three models, the air-conditioner condenser is assembled with the coolers for better protection.

“In the DL250A, the air-conditioner condenser can be accessed directly by lifting the grille, whilst in the DL300A and DL420A, the air-conditioner condenser can be tilted backwards, to simplify cleaning,” says the spokesman.

Furthermore, the air cleaner features a larger filtration area enabling increased service intervals of 1,500 to 2,000 hours for the filters. The air cleaner covers are latched and easier to open.