How many pieces does the LEGO Mobile Crane (8421-1) have?

The LEGO Mobile Crane set (8421-1) contains 1885 pieces. It was released in 2005 as part of the LEGO Technic theme.

How can I find missing parts for LEGO set 8421-1?

On BrickMissing you can check which parts from the LEGO Mobile Crane (8421-1) you already own. Add your LEGO collection and we'll show exactly which of the 1885 pieces you're missing and which you already have.

Can I build the LEGO Mobile Crane with parts I already have?

Use BrickMissing's free parts checker to find out. Add LEGO sets you own to your collection and we'll cross-reference all 1885 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO Mobile Crane from?

The LEGO Mobile Crane (8421-1) belongs to the LEGO Technic theme. You can browse all Technic sets on BrickMissing to find more sets from this theme.

Mobile Crane

8421-1 Technic 2005 1885 parts 2.5% repair risk Intermediate

Command the most impressive machine on any LEGO construction site with the Technic Mobile Crane (8421-1). This authentic 2005 model features a fully functional pneumatic system that uses cylinders and an air pump to precisely raise and lower its massive boom. Power is delivered by an included motor and battery box, allowing the boom to extend telescopically to over 64 cm and lower the hook. Navigate the site with realistic six-wheel steering, where the wheels drive the pistons of the integrated V6 engine, a detail hobbyists will appreciate. Four retractable outriggers stabilize the impressive structure, which measures over 46 cm long, and the boom rotates a full 360 degrees for comprehensive coverage. Additionally, builders can transform this complex vehicle into an Aerial Lift using alternate instructions.

Parts Inventory

🧱 1885 parts

Part	Color	Qty	LEGO price each
String with End Studs 31L Overall 14226c31	Black	2×	€3,00 View at LEGO → View
String Cord Medium Thickness 250cm 14728c250	Black	1×	Check price → View
Plate 2 x 2 Corner 2420	Yellow	2×	€0,07 View at LEGO → View
Tile 1 x 4 with Groove 2431	Yellow	2×	€0,12 View at LEGO → View
Tile 1 x 4 with Groove 2431	Black	1×	€0,12 View at LEGO → View
Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] 2444	Black	2×	Check price → View
Brick 2 x 6 2456	Yellow	4×	€0,29 View at LEGO → View
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] 2654	Black	3×	€0,07 View at LEGO → View
Technic Slope Long 1 x 6 with 3 Pin Holes 2744	Yellow	6×	Check price → View
Technic Pin with Friction Ridges Lengthwise and Center Slots 2780	Black	234×	Check price → View
Pneumatic Pump New Style with Black Top 2797c02	Yellow	1×	Check price → View
Plate Special 2 x 2 with 2 Pin Holes 2817	Yellow	1×	Check price → View

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Repairability

Can you fix Mobile Crane if a piece goes missing?

2.5%Low repair risk

easy to fixguard this box

5 of the 201 part+color combinations in this set appear in 3 or fewer sets ever made. Lose one of those and a replacement is very hard to find.

Theme average

6.5%

All sets

6.7%

Hardest to replace

Battery Box, 9V 4 x 14 x 4 · Yellow · only this setHose, Pneumatic 4mm D. 16L · Black · only this setSticker Sheet for Set 8421-1 · Unknown · only this set

How we calculate this →