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Liebherr LR 634
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Fully remote controlled large scale Liebherr crawler loader
About this creation

Fully working 1:13 scale model of crawler loader

Real machine:

LEGO Model:

I choose big 1:13 scale as the rest of the last few models. That way they all can be present together. I have a plan to build few 1:13 sale truck, too.


Chassis is built according to drawing of the real machine's chassis. It has main Dark Gray part and Yellow "nose". All the motors are in the gray part.

Chassis is built so it is symmetrical and has no weak points.

Chassis also incorporate 4 small turntables for connecting tracks and drive sprocket wheel to itself.

Those turntables prevent sprocket drive wheels and tracks to tore them self out of the chassis, while they allow infinite rotating.


For the drive I used two XL Motors, geared 3:1, with thick double bevel gears, and the drive is virtually indestructible. The whole drive module is boxed in technic bricks, and braced with all sides to many points.


As I have somehow little experience with big tracked vehicles, I wanted to build this machine to be as strong as possible, in fact so strong that its main sections could not be removed without precise removing few key axles.

That is especially important to tracks, as they are not usual tracks you find on excavators. Tracks on this loader are connected on two points to the chassis, but none of them is rigid connection.

First connection is at the back, where the tracks osculates around the axle.

Second connection is at the front, where the tracks are connected to each other and to the chassis via ball bearing equalizer bar.

Tracks are build with bricks and plates, and they are six studs wide. There is really very little empty space left inside them.

Also, to make driving more smooth, both front sprockets have tensioners.


Using arrangement described above, the machine has real pendular suspension, which allows it to drive over obstacle with one track, while other remains flat on the ground. On my model, I used the tightest ball bearing possible, and they work perfect. Tiny slack in the small turntables perfectly allow for the tracks to move slight laterally when one track in in extreme top or bottom position.

Loader arm:

Modeled to look accurate, not for strength. It can carry itself and the bucket and some load. Not made to be heavy duty.

Z Bar kinematic allowed for fine tuning to achieve full range of big Linear Actuator movement.

I managed to achieve full range of bucket movement in any position, and good range of arm movement.

Also, in this configuration, the bucket has vertical lift, which means that, while lowered or risen, bucket stays always in the same angle as it was in before the lowering/rising.

Normal loaders usually have radial lift, where bucket lose its original angle.

Loader arm is connected to the frame via 15L liftarm that runs whole height of the chassis and "nose" section, and it has 10 supporting points, making it impossible to bend or break.

Arm is powered by 2 M Motors, driven directly to LA's via 4 universal Joints in total.

Tool Boxes-Cabine platform:

The loader has two small tool boxes at the sides, and one big storage area beneath the cab.

It is very sturdy as it has to carry 1 kg cabine.

It has studs facing in 3 different directions, but still, not a single stud visible.


Cabine is most detailed part, and most noticeable.

It is white outside, and light blush gray on the inside. It has fully detailed interior, which is built according to the interior of the real machine. Also, it has tiles floor, with grill tiles to prevent slippage.

Most noticeable feature of the cab is "glass" which is built from really lot transparent light blue plates. It is curved to achieve organic flow with the cabine, ans I really like it. I have already built few of this glasses on my models, but this one turned the nicest. It seems that the fellow forum member does not share my enthusiasms, in a fact lots of them does not like it.

Cabine is very curved, only sections not curved are the sides. I tried to make the cabin as real as possible, and I ma very pleased with that. Well, after 6 rebuilts, Its gotta be.

I planned to make roof flat, but I remembered that I had some new white slopes in 1x10 lengths, and when I compared them to the blueprints, they matched perfectly! I incorporated front overhanging sections for front lights.

Details on the cab included handles, 3 per side,

Engine tower:

At first I used slopes in various lengths, and it worked fine, but it bugged me that curve achieved by slopes is not very similar to the blueprint. Last two days of building I decided to destroy tower and make a new one with tiles. That way I could make it very close to the original, and also it allowed me to have more room inside.


I used stickers custom made to fit the model. I made them on my computer and printed them in a local printing firm on transparent sticky foil. There are around 18 stickers on a model. I think they really add a nice touch.


Main attachment for this machine is the Ripper. It is operated via two big Linear Actuators. In this version, they are operated manually.

Model performance:

Model performs beyond my expectations. It is very densely built and accordingly, very heavy, nearly 4 kilograms, and it showed on tracks. They are extremely strong, but the problem is that they sag outwards, and away from each other, due to weight of the loader. After few days perfect solution came, and I installed that second self balance rod in a very elegant way that kept tracks perfectly straight and perfectly parallel to each other.

During filming the video, outside was still a snow, and I was afraid because all of the water. But i found great spot with both dry snow and clean tarmac to make the movie.

Model performed excellent, steered great, and pendular suspension really worked great due to heavy weight. Top speed is ok, it has a lot of power, and due to use of double bevel gears that were placed in line, and therefore their connection in the strongest possible, nothing never cracked. When the model face the obstacle, it either roll over it, or the tracks are spinning in place.

This loader is one of my favorite mocs so far, and I intend to keep it built and to upgrade it to the new pneumatics when they arrive, and make them RC with LEGO servo motors.


PS. This is my new YouTube channel, so if you like this and would like to see more creations like this, please consider subscribing. Thanks!

Comments LEGO Models
 I like it 
Frog Bricks
  February 27, 2015
Great Job!
 I like it 
  February 16, 2015
 I like it 
  February 16, 2015
Superb creation! Well done!
 I like it 
  February 16, 2015
Great work - looks like real thing! I was wondering what happened with your YT channel - I'll definitely subscribe!
 I like it 
  February 16, 2015
Wow, very nice work! It is a lot bigger than I thought after looking through the pictures.
 I made it 
  February 16, 2015
Thanks guys! Nick, this thing is just going to few revisions until new pneumatics come online, then I will convert it to use them :) Thanks again guys!
 I like it 
  February 16, 2015
Incredible work!
 I like it 
  February 16, 2015
A technical marvel - you seem to have covered everything with this one. The level of detail is off the charts as well. Never take it apart!
 I like it 
  February 15, 2015
Very Awesome model..!
 I like it 
  February 15, 2015
I'm impressed! I first thought someone posted a non-Lego moc but I'm wrong! Overall appearance is neat and the tracks and shaping are awesome!
 I like it 
  February 15, 2015
I agree with Luke: Tremendous work, here. The result is stunning.
 I like it 
  February 15, 2015
Very impressive model, the cabin in particular catches my eye. Great work!
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Added February 15, 2015
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