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Set 42042 Crawler Crane
Technic

Crawler Crane

The Crawler Crane 42042 is a large-scale LEGO® Technic model of a construction crawler crane, the kind used to lift heavy loads on major building sites. With 1,400 pieces across 141 unique elements, it was one of the more substantial Technic sets of 2015. This page covers the full parts list, colours and key facts about the set.

Set number
42042
Year
2015
Pieces
1,400
Minifigures
0
Theme
Technic
Different parts
141
What can I build with it?

View the official building instructions at LEGO® ↗

Parts list 141

As BrickLink list (XML)

Import on BrickLink: Wanted → Upload, upload the file (or paste its content), pick a Wanted List and add the parts.

Spare parts (11)

These extra parts come with the set in case one gets lost.

Description

Function over play

Unlike LEGO® sets built around minifigure play, the Crawler Crane is a pure function model: the superstructure rotates on the chassis, the boom extends telescopically and outriggers fold down from the base to keep the model stable when lifting. Every one of these mechanisms is built from gears, axles and linkages rather than pre-made shortcuts, which is typical of larger Technic sets from this era. The result is a model that demonstrates how a real crawler crane works, mechanically, piece by piece. Building the drivetrain first and the superstructure afterwards also makes the connections between each function easier to follow.

A construction-site colour scheme

The model leans on black, light and dark bluish grey, with blue picked out on the chassis and cab as an accent. That restrained palette across 141 unique parts mirrors the look of real heavy machinery rather than a bright toy aesthetic, and it keeps the build visually calm despite its complexity. If you are shopping for spares or checking what a particular element looks like, the parts list on this page shows every colour used in the set.

Building time and skill level

At 1,400 pieces with no minifigures, this is a build for builders who enjoy mechanism over story. Expect the assembly to take considerably longer than a same-sized System set, since many of the pages are dedicated to gearing, linkages and the working boom rather than straightforward stacking. It suits Technic fans who want a satisfying afternoon (or several) at the table and a finished model with genuinely moving parts to show for it.

Why the parts list matters here

Because so much of the Crawler Crane depends on specific Technic elements such as gears, axles and pins working together correctly, a missing or swapped-out piece is more noticeable than in a typical brick-built set. If you have picked this set up secondhand, the parts list on this page is a useful reference for checking what should be included and sourcing exact replacements for anything that is missing.

FAQ

Can the Crawler Crane 42042 be motorised?
Yes, the model is designed to accept LEGO® Power Functions components, which are sold separately. Without them, the crane's rotation, boom and outriggers are all operated manually.
How many pieces and minifigures does the set include?
The set contains 1,400 pieces across 141 unique elements. It does not include any minifigures, as it is designed purely as a mechanical model.
Who is this Technic set suitable for?
It suits builders who enjoy working mechanisms more than play scenes, and who are comfortable with a longer, more technical build than a same-sized System set.

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