The D4 still has the same roller frame, tractor frame, C-frame, Cat C4.4 engine and horsepower that were found on the D6K2. The D6K2’s proven undercarriage design is still there too. With eight ...

Caterpillar product application specialist. “One thing we have on this 302.7 that we've never had on this size machine before is an expandable undercarriage.” The expandable undercarriage ...