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Liebherr LTM 1750-9.1 Mobile Crane

Maker:  MOC (YoYo)
Model No: 
Scale:  1:18 approx
Review Date:  September 2021

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Liebherr LTM 1750-9.1 Mobile Crane Video (Parts 1 to 4)
Branded box.
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The carrier cab.
The carrier.
Hook hitched at the front.
Rear view.
Boom fully extended.
Lifting the load box with Y-Guy attached.

The Liebherr 1750-9.1 mobile crane has a maximum capacity of 800 tonnes at 3m radius, and has a 52m telescopic boom.

This model of it is built in the Technic system, and it is an MOC - Modeller's Own Creation - rather than being developed by Lego or Liebherr.   The bricks are claimed to be Lego Technic compatible and are made by YoYo.

Scaled from the carrier cab it is approximately 1:18 scale.


The model comes in a large YoYo branded box which is full of numerous bags of parts.  It is a heavy box.

Two substantial manuals are provided and these guide the building of the model.  All of the steps are pictorial, with no writing.  The build is not difficult in terms of most of the individual steps, but it is a complex model so some previous experience is really necessary.  Precision and accuracy is required, as any error may not manifest itself until later in the build making it difficult to correct.  There are also some errors and unclear stages in the instructions, and the small size printing is also challenging.

There are separate stages of construction.  Part types are generally grouped together in the same bag which make things easier, but much time will still be spent searching bags for less common parts.

Sticker sheets are provided to apply the graphics.


The model is made of red and black parts to reflect the Mammoet livery.

The designer of the model has done a good job within the limits of this construction system to represent the details and proportions of the real crane.

Mammoet and Liebherr stickers are provided which can be used to decorate the model.


The designer has included a high degree of functionality through the use of motors and associated gear mechanisms, controlled by mini remote controllers.

The carrier cab doors can be opened.

The carrier moves forwards and backwards at a single speed, and there is multi-wheel steering.  However, the mechanisms struggle a little with the heavy weight.

The outrigger beams rotate out from the transport position but the mechanism is complex and proved unreliable.  Telescoping the outrigger beams is also motorised and this works well.  The pads are screwed down manually, but the beams are not really load bearing.

The crane cab rotates from the transport position to the operating position.  The cab can also be raised and lowered manually.    The handrails on the top of the crane can be folded into a transport position.

The crane rotates using a motor but the loads on the slewing gear challenge the mechanism.

The main boom ram has a motor but the boom is to heavy for the ram to lift the boom from horizontal.

The three stage telescopic boom can be extended by motor.  The manual is not clear about how a telescopic rope should be reeved to allow all stages to be telescoped remotely, but in practice a way was found to make this work well.

The motorised winch works well.

The Y-guy arrangement can be posed in a working position.  It does not have the winches modelled, but it can be reeved up to look good.


The instructions are comprehensive but printed too small to be comfortable to use and there are some errors in them.  The quality of the parts is generally very good, although there were a few that were slightly out of tolerance leading to a less good fit.


The set is costly, but it is a large set with thousands of pieces.


This is a complex and challenging model to build and it is certainly not one for a beginner.  The assembly instructions are comprehensive and sometimes require interpretation. 

The model is very impressive because of its huge size and it is a good looking representation of the LTM 1750.  However, its sheer size also challenges the motorised mechanisms.  Some of them struggle to deal with the loads they are under, so those aspects should be judged for their build interest rather than as working features.


The complete model in transport mode.
An outrigger beam.
Looks good.
Opening cab door
Massive model.
Y-Guy arrangement.