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Doosan DL420CVT-7 provides operating efficiencies

Doosan DL420CVT-7 wheel loader
Müller und Töchter GmbH & Co. KG's new Doosan DL420CVT-7 wheel loader

New wheel loader slashes fuel costs per tonne of material produced at Bavarian sand pit

SINCE 1920, Müller und Töchter GmbH & Co. KG have been operating various sand pits in the Franconia region of Bavaria in Germany. Now, the arrival of the company’s first Doosan wheel loader, a new DL420CVT-7 model, with a continuously variable transmission (CVT), has significantly reduced fuel costs per tonne of sand produced.    

The new machine is being used in the sand plant at the company’s headquarters in Wilburgstetten, where it feeds 1,000 tonnes of material into the washing plant every day.


One of the main factors for the DL420CVT-7’s low fuel consumption is its variable transmission, as Marc Glesius, sales manager for wheel loaders at Doosan in Germany, explained: ‘This transmission combines the advantages of a mechanical and hydrostatic transmission and eliminates the disadvantages underlying both systems. The variable transmission changes smoothly from hydrostatic drive to mechanical drive as the speed increases and depending on the requirements of the application.

‘The advantages of this system include, in particular, the excellent traction offered by a hydrostatic transmission and the ability to drive over longer distances with a purely mechanical one. The fuel savings of up to 30% are due to the lower engine speed required to achieve maximum speed or traction compared with conventional transmissions.’

For the quarrying and mining industries, where productivity in terms of tonnes of materials per litre of fuel is crucial, the faster loading cycles and higher bucket capacity of the new generation DL-7 wheel loader series from Doosan provide more efficiency as well as lower fuel consumption.

At Müller und Töchter, the DL420CVT-7 wheel loader is used with a 4.7 cubic metre bucket, working in both loading and travel modes, allowing the advantages of the CVT transmission to be fully exploited.

Managing director Georg Müller, who bought the machine from the Doosan dealers Rühle, with whom he has had a close relationship for many years, said one of the decisive factors behind his purchase decision was the performance of the wheel loader in a one-week demonstration at the sand pit.

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