Hamm is expanding its DV+ line with the soon-to-be released 90i tandem roller.
The first 7.7-ton DV+ 70i was introduced in March at ConExpo, and the 9.9-ton DV+ 90i will be available in January 2018.
The DV+ 70i and DV+ 90i are available in three versions: as a double vibration roller (VV), as an oscillation roller (VO) with vibration drum at the front and oscillation drum at the rear, and as a combi roller (VT) with vibratory drum front and pneumatic tires at the rear.
All vibration drums are split.
In addition, the rollers can be equipped with various chip spreaders; the HCQ Navigator intelligent compaction measurement and documentation system; country-specific lighting; edge pressing and cutting equipment; and many other extras.
An intelligent drive control – plus pivot steering with four steering modes and large turning angles – form the basis for high quality compaction.
The design is well thoughtout, enabling an excellent view of the drums and the work environment, an important point when it comes to getting the smoothest mats and adhering to strict quality and safety requirements.
Split drums and smart drive 
The standard split drums ensure perfectly compacted asphalt layers, even in tight curves, according to Hamm.
There is also a large turning angle, and the enormous track offset of the pivot steering allows the DV+ rollers to steer with great sensitivity in four different steering modes.
Thanks to the automatic reverse transmission, gentle braking and reversing with simultaneous seat reversal and subsequent acceleration are easily accomplished.
With the DV+, surfaces can be quickly compacted to a high standard, as all components in these rollers are matched to one another.
An important factor is the evenly distributed weight of the DV+. This is due to the positioning of the engine in the centre of the machine and the two-part water tank that distributes the weight evenly in all operational states.
Long work intervals
Refueling breaks interrupt the compaction process.
To avoid interruption, Hamm equipped the DV+ series tandem rollers with large water and fuel tanks. Filling is user-friendly as the water can be replenished centrally from the ground quickly via a pressurized supply of at least 14.7 psi as a standard feature.
With tanks linked together via communicating pipework, they are filled simultaneously. Connection to a hydrant is also an option. Alternatively, water can be gravity-fed from above via one of the four filling spouts on the top. Replenishment of diesel and hydraulic fluid is also arranged to be carried out from ground level.
When Hamm developed its compaction line, the company worked in collaboration with universities and ergonomics experts, as well as end users. The result is the Easy Drive concept, an ergonomically optimized operator platform with many inventive details. For example, the seat allows the driver to adopt a relaxed sitting position, facing the direction of travel in all situations, as it turns mechanically by 90 degrees in either direction.
As an option, the seat can also be electrically shifted and rotated by up to 350 degrees. The height, suspension and depth of the seat — as well as the position of the armrests — also are individually adjustable, as is the steering column angle.
Another feature of Easy Drive is its operating structure.
The steering wheel is used for steering, while all other important functions are operated via a joystick and the multifunction armrest.
Here, the driver is able to see all the keys on the joystick.
All other operating elements are arranged around the joystick with the most frequently used fuctions placed closest to it. At the same time, the operation is designed to be entirely language-neutral.
Hamm uses colour coding to achieve an obvious assignment of the functions, and a clear overview.
Furthermore, Easy Drive provides a wide access way to the platform or cab. this is achieved with foldable armrests on request or an easy exit with tiltable steering column.
Documents and personal items can be securely stored in the many compartments around the seat. as well, two 12 V sockets provide power for a cell phone or ice chest. In the optional cab, sound insulation reduces noise levels from the already quiet engines.
Limitless visibility
Hamm offers two versions of the DV+ for North America: with ROPS, or with enclosed ROPS panoramic cab.
With both versions, operators have an advanced view of the drum edges at all times. This is made possible through the design of the platform or cab and of the water tanks. A special feature is the glass viewing pane in the floor that allows an unobstructed view of the drums.
On the models with ROPS cab, standard split doors ensure ample fresh air, and the upper half can be rotated by 180 degrees, while the lower rotates 85 degrees.
When the door is closed, air is led through window vents to the interior, and in winter, ventilation slots ensure speedy de-icing.
Future-proof engine
The DV+ 70i is equipped with a 75 hp engine to satisfy the requirements of Tier 4 / Stage IIIB emission requirements. The power pack filters soot particles with an effective diesel particulate filter as part of the exhaust purification.
This means the rollers are equipped with future-proof technology that can be used even in the most strictly regulated markets. The new automatic engine stop system may be incorporated as an optional extra, which switches the engine off during extended periods of inactivity to save fuel.
