Wheel Dozer
A wheel dozer is basically a big blade to push material mounted on 4 or more wheels. The most common aspect is +the hybrid son of wheel loader and a tracked bulldozer+ particularly used by Caterpillar (you can find HERE a short introduction video), but it can also be more exotic such as the Hough D950 or the mighty Melroe M-880 (video here).
Hough D950 “Bigfoot” Melroe M-880
Compared to a classical tracked bulldozer, the wheel loader can’t push the same very high load, and is limited to “clean” ground (without rocks), but otherwise it has the advantage of a higher speed on site and excellent maneuverability, and consequently is mostly use as support vehicle in mining operation.
If you want more info on the comparison between a tracked dozer and a wheel dozer I recommend you the following article: http://viewpointmining.com/article/wheel-dozers-help-mines-increase-efficiency )
The MOC
This moc is an articulated vehicle not really based on a real machine but you can find some similarity with a CAT 844 or 854.
All pictures are available on Flickr
The front part supports the blade and lights.The rear part with a lightly detailed cabin, a working fake L6 engine under an openable hood, a BuWizz controller and some safety handrail.
What’s inside?
Propulsion is made through a PF-XL motor placed at the rear end of the truck. A reduction ratio of 3/5 is used to the drive train while a 5/3 ratio is used to power the fake engine. The vehicle is 4 wheel drive with a differential on both front and rear axle, plus the rear axle is pendular.
A servomotor is used for steering in a simplified technic than the one used on set 42030 (Volvo L350).
The front blade is operated through a single Servomotor.
Some reason to this technical choice : Firstly, the blade only moves only from a lower to an upper position with no particular need to be precisely placed. A traditional motor plus linear actuator or worm gear would have made the same job, but would have been significantly slower. So the use of the SM allows a faster move and an intermediate position can also be reached thanks to the use of the BuWizz controller.
And secondly, even if the SM has a weird shape it remains compact and fitted well in the front part on the dozer.
+Additionnal picture to be added here+ 
Thank you for reading.
This is a personal creation made of Lego elements, not an official set you can buy in store.
This MOC is currently not available for sale through MocHub or for download.
Every operation is looking for high production support machines. Cat wheel dozers combine the production capabilities of track-type tractors with the mobility and versatility of wheel loaders to give you an outstanding utility machine.