bulldozer Caterpillar D6N LEGO Model Team

[amon161]

This is a model of a bulldozer CAT D6N the famous American manufacturer. The model is made in the style of Model Team and Lego creator expert. The inner part consists of Lego technic parts. This model uses the following system Power Functions. The chassis of the bulldozer has an active suspension like the original model. The control of the bulldozer knife is carried out in two directions. The operator's cabin is fully detailed. The model uses four motors, two L motors for turning the chassis, one M motor for lifting and lowering the knife, and a train motor is used to turn the knife.

[Gray Gear]

Looks pretty good! 

Can you show how the insides are made and how the functions work? I would be interested in the suspension system in particular. Those roadwheels look fixed to me, so I am curious how the suspension is achieved.

Thx for sharing!

[Milan]

@amon161 Welcome to EB!
What a nice dozer! In a not so common color, which makes it even more appealing. Nice work on all the angles, specifically on the cabin and on the hood. Functions look nice too, as well as the suspension.

@Gray Gear
It looks like it has an equalizer bar, with a center pin mounted on the chassis, and its sides mounted on each of the tracks.

[Gray Gear]

@Milan So the whole assembly mounting all the wheels exept the drive sprocket can pivot around that pin? That would mean most of the load would be carried by that pin, and the road wheels under the pin basically have nowhere to go... I guess such a system is fine for a very heavy a vehicle going very slow only, so hard shocks don't happen. I am more familiar with tank suspension, and there such a system would not be acceptable. In my mind this isn't a "real" suspension system, just like pendulum axles. Both systems help to adapt to the road conditions, but if there is a shock to all wheels at once, it would be useless.

Thank you for explaining, I learned something new today 

 

Edit: Another question: What's that lgb pole sticking up from the blade? I have looked at some images of the real vehicle, and sometimes a hoze or something is connecting this pole and the main body of the bulldozer. I have no clue what that is 

Edited October 16, 2021 by Gray Gear

[jorgeopesi]

Awesome dozer and with suspension, great work.

[Milan]

@Gray Gear Yes. The tracks are mounted on the back to the chassis. Somewhere near the front they are attached via equalizer bar, thus allowing the tracks to move up and down independently, while the back sections are kept fixed.
Until amon put his pics, here is a visual on how it can be done in Lego (Liebherr Tracked Loader, but they use the same suspension system as CAT on these machines).

 

Regarding the LGB pole, that is a GPS device that helps the driver (and surrounding workers) to make precise movements of the machine, thus keeping the measurements of the project correct (at least on the ground level) and checked in real time.

[amon161]

thanks for the comments, yes, indeed, the suspension scheme is like this, I'll post the photo a little later.