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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.
Packaging
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.
Detail
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.
Features
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.
Quality
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.
Price
The set is costly, but it is a large set with
thousands of pieces.
Overall
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.
Footnotes
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| The complete
model in transport mode. |
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An outrigger beam. |
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Looks good. |
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Opening cab door |
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Massive model. |
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Y-Guy arrangement. |
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