Beginner
≈ 21 hSuggested range12 h 30 min – 33 h 45 min
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Technic · SET 42009
Mobile Crane MK II
A large yellow mobile crane with a boom and hook.
- Pieces
- 2,606
- Release year
- 2013
- Theme
- Technic
- Set number
- 42009
- LEGO recommended age
- 11+
- Archived regional retail price · Germany
- 199.99 €
Archived regional retail price in the stated market and currency. It does not establish the Italian launch price; no estimated currency conversion. Brickset ↗ · Reference checked on 22 October 2026
Official English name verified at: LEGO English archive ↗ · Checked on 26 October 2026.
TIME TO BUILD
How long does it take to build Mobile Crane MK II?
A starting point for planning your build. Times for each experience level are editorial estimates, not measurements submitted by HowLongToBuild users.
Editorial estimate · first build
Intermediate
≈ 14 hSuggested range8 h 15 min – 22 h 30 minExperienced
≈ 9 h 45 minSuggested range5 h 45 min – 15 h 45 minBased on one person building the set for the first time, following the original instructions and using numbered bags where supplied. Includes normal piece-finding and minor adjustments; excludes long breaks, filming, dismantling and modifications. Sources may use different methods. This range is neither a statistical interval nor a limit: your build may take less or more time.
How we estimate times · sources and method
Editorial assessment: A large yellow mobile crane with a boom and hook. The yellow and black structure ends in a cable with a hook. A first build following the instructions, including normal piece finding; an adult may help when needed. Breaks, subsequent play and any alternative models are excluded. For older sets, unnumbered bags or previously mixed pieces may prolong sorting. No verified timed build: indicative values with substantial variation.
Sources do not always specify the builder’s experience. The three experience bands are our editorial assessment, based on the complexity of the set and individual accounts where available.
- LEGO · set-specific instructions ↗
Official name, pieces, age and imagery; no timed building data.
- LEGO · set manual ↗
Document for this set number. The duration is an editorial estimate, not a LEGO timing.
Checked: 26 October 2026 · Method v1.0 · Limited reports; not a statistical average.
BUILT BY THE COMMUNITY
Yours could be the first building time.
0 reviewed solo building times.
No solo building times have been reviewed yet. You can still find editorial estimates under Suggested times.
Log your buildBuild your own story.
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Create a free account →BEYOND THE BRICKS
Did you know?
Inside the set
Five axles
Ten wheels support the vehicle's long chassis.
LEGO sourceExtended boom
The yellow and black structure ends in a cable with a hook.
LEGO sourceBeyond the set
The stories, places and inventions behind your build.
A turning point in crane history
In 1949 Hans Liebherr patented the TK 10, a mobile tower crane designed for reconstruction sites.
LiebherrFaster erection
The TK 10 could be erected in two or three hours, while many contemporary cranes required several days.
LiebherrWritten by HowLongToBuild · Sources are linked with each story · Checked on 26 October 2026. Historical facts and story details refer to the context described.
THE COMMUNITY’S EXPERIENCE
What was it like to build?
Three separate scores from 1 to 10. For difficulty, 1 means very easy and 10 means very difficult.
No approved ratings yet. Scores are never generated by this site or inferred from the recommended age.
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Specific steps, useful checks and sticking points. Contributions appear after moderation, in their original language. Do not upload instruction pages or personal contact details.
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Sign in to contributeSET THE MOOD
A soundtrack for your build
· Selected for the subject and atmosphere
The piano moves from tiny gestures to more physical crescendos. We pair it with builds that grow in layers: keep the volume low when instructions demand more attention.
OUR PICK
Spaces (Special Edition)
Nils Frahm
Piano, tension and spaceA build to spread over several sessions: choose the more understated option when you want the instructions to take centre stage. The music does not set your pace.
Editorial suggestions, not official soundtracks for the set. External services may require an account or subscription; editions and availability can vary by country. Suggest another soundtrack →
Report a problem with this set →
YOUR NEXT BUILD
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