Dynapac has launched a range of new tandem asphalt rollers, which include three new high frequency (HF) tandem asphalt rollers covering the 10- to 13-ton (9 to 11 t) range.
The Dynapac CC424HF, CC524HF and CC624HF new generation articulated tandem rollers will replace Dynapac’s CC422, CC522 and CC622 machines.
The first models of the new range primarily are aimed at larger projects such as highways and airports and equally suited for use on both thin and thick asphalt layers.
Dynapac has introduced a number of features to the new rollers to make servicing quick and easy, ensuring their maximum availability.
Attention has been paid to keeping servicing simple, for instance by concentrating filters to one side for ease of replacement. Hydraulic hoses can be replaced in individual segments, avoiding the need to fit a full length. Drum shock absorbers also benefit from easy replacement — there is no need to remove the forks or the drums. The hydraulic oil tank has been placed in a high position, making it easy to check the oil level.
As a supplement to the central water tank, optional use of additional front and rear water tanks gives a total capacity of up to 370 gal. (1,400 L), enabling a full day’s operation without refills.
Each of the new models is powered by a Cummins QSB 4.5 water-cooled turbo-diesel engine with after cooler. The rated power is 110 or 125 hp (81 or 93 kW) at 2,200 rpm for the Dynapac CC424HF; 125 or 152 hp (93 or 113 kW) for the CC524HF and CC624HF. The new models have operating masses ranging from 10.5 to 12.6 tons (9.5 to 11.4 t), with the weight split evenly between front and rear drum modules.
The Dynapac CC424HF, CC524HF and CC624HF feature “soft” starting and stopping to prevent bowing or cracking in the asphalt layers; allowing even an unskilled roller operator to start and stop without leaving marks.
Through modularization customers can specify machines that meet their particular needs, including aspects such as the engine power, operator’s station, air conditioning and an optional Xenon lighting kit so that operation is as easy at night as during the day.
A key feature from Dynapac is the decision to place the engine on the rear module, which gives less noise and no heat to the operator’s platform. The position also improves access for servicing. Positioning the exhaust pipe as low as possible also minimizes the operator’s exposure to fumes.
Many of the enhancements bring environmental benefits through reduced fuel consumption or quieter operation. Efficiency enhancements have saved some 11 hp (8 kW) in the operation of a typical model in the range, with consequent improvements in the running costs and noise.
The new rollers automatically cut to idling speed after 10 seconds at full rpm in neutral. This reduces emissions, saves fuel and minimizes the noise.
For more information, visit www.dynapac.com.