No, it is a conventional engine, but the dozer has electric drive motors. The diesel powers a train style generator.
R.G. LeTourneau (LeTourneau, Inc.) built some of the largest earth moving machines in the world. The old man was fanitically opposed to the use of oil hydraulics and insisted that his machines use electric motor powered winches and cable for all the actuators. That extended to the propel drive train as well. He was so biased against oil that he swore that if there was a way to run an internal combustion engine without lube oil, he's do it. After the fonder retired they slowly integrated oil hydraulics into their machines. Many of the huge open pit dump trucks also use and electric drive as well.
Regards,
GtG
Ferdinand Porsche invented that type of drive train for his version of the Tiger tank. It was a bust, but he was pals with Hitler, so they built 100 of them anyway.