8421-1

Mobile Crane

Set number: 8421-1
Year: 2005
Theme: Technic
Parts: 1,885
Minifigures: 0

Building instructions

The building instructions are on the official LEGO website. We do not host any instructions ourselves; the link below takes you to the official page.

View building instructions on LEGO.com (opens an external website)This set on Rebrickable (opens an external website)

Parts list – 8421-1 Mobile Crane

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212 lines, 1,907 pieces

Parts list of set 8421-1
Part	Name	Colour	Quantity	Note
2456	Brick 2 x 6Bricks	Yellow	4×
3941	Brick Round 2 x 2 with Axle HoleBricks Round and Cones	Trans-Neon Orange	3×
3665	Brick Sloped Inverted 45° 2 x 1Bricks Sloped	Dark Bluish Gray	4×
41768	Brick Wedged, Angled 4 x 2 LeftBricks Wedged	Yellow	4×
41767	Brick Wedged, Angled 4 x 2 RightBricks Wedged	Yellow	4×
2847c03	Battery Box, 9V 4 x 14 x 4 with Dark Bluish Gray Base [Complete Assembly]Electronics	Yellow	1×
42908	Motor, RC Race BuggyElectronics	Black	1×
5306bc020	Wire with Brick 2 x 2 x 2/3 Pair, 20LElectronics	Black	1×
41672	Large Figure Skeletal, Limb 1 x 3 x 7 Beam with Axle Holes (Bohrok)Large Buildable Figures	Black	2×
4477	Plate 1 x 10Plates	Black	2×
3023	Plate 1 x 2Plates	Dark Bluish Gray	2×
3023	Plate 1 x 2Plates	Yellow	13×
3623	Plate 1 x 3Plates	Dark Bluish Gray	2×
3623	Plate 1 x 3Plates	Yellow	6×
3710	Plate 1 x 4Plates	Yellow	16×
3666	Plate 1 x 6Plates	Black	1×
3666	Plate 1 x 6Plates	Light Bluish Gray	1×
3666	Plate 1 x 6Plates	Yellow	10×
3460	Plate 1 x 8Plates	Dark Bluish Gray	8×
3460	Plate 1 x 8Plates	Yellow	6×
3022	Plate 2 x 2Plates	Yellow	3×
2420	Plate 2 x 2 CornerPlates	Yellow	2×
3021	Plate 2 x 3Plates	Yellow	1×
3034	Plate 2 x 8Plates	Yellow	1×
3032	Plate 4 x 6Plates	Dark Bluish Gray	1×
3035	Plate 4 x 8Plates	Dark Bluish Gray	1×
6141	Plate Round 1 x 1 with Solid StudPlates Round Curved and Dishes	Trans-Clear	6×
6141	Plate Round 1 x 1 with Solid StudPlates Round Curved and Dishes	Trans-Neon Orange	4×
6141	Plate Round 1 x 1 with Solid StudPlates Round Curved and Dishes	Trans-Red	2×
4032a	Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)Plates Round Curved and Dishes	Black	3×
2654	Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Plates Round Curved and Dishes	Black	3×
3794a	Plate Special 1 x 2 with 1 Stud without Groove (Jumper)Plates Special	Light Bluish Gray	6×
3794a	Plate Special 1 x 2 with 1 Stud without Groove (Jumper)Plates Special	Yellow	2×
2444	Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs]Plates Special	Black	2×
2817	Plate Special 2 x 2 with 2 Pin HolesPlates Special	Yellow	1×
53178	Pneumatic Cylinder BracketPneumatics	Yellow	2×
47225	Pneumatic Cylinder with 2 Inlets and Rounded End Medium (48mm)Pneumatics	Yellow	2×
2797c02	Pneumatic Pump New Style with Black TopPneumatics	Yellow	1×
47223a	Pneumatic Switch with Pin HolesPneumatics	Dark Bluish Gray	1×
4697b	Pneumatic T-Piece (T Bar) [New Style]Pneumatics	Light Bluish Gray	1×
53535	Sticker Sheet for Set 8421-1Stickers	[No Color/Any Color]	1×
14728c250	String Cord Medium Thickness 250cmString, Bands and Reels	Black	1×
14226c31	String with End Studs 31L OverallString, Bands and Reels	Black	2×
70496	Hook, Technic - LargeSupports, Girders and Cranes	Black	1×
3737	Technic Axle 10Technic Axles	Black	5×
3708	Technic Axle 12Technic Axles	Black	2×
32062	Technic Axle 2 NotchedTechnic Axles	Red	24×
4519	Technic Axle 3Technic Axles	Light Bluish Gray	55×
6587	Technic Axle 3 with StudTechnic Axles	Dark Bluish Gray	1×
50450	Technic Axle 32Technic Axles	Black	1×
3705	Technic Axle 4Technic Axles	Black	34×
32073	Technic Axle 5Technic Axles	Light Bluish Gray	40×
32209	Technic Axle 5.5 with Stop [Flat Short End]Technic Axles	Dark Bluish Gray	15×
3706	Technic Axle 6Technic Axles	Black	5×
44294	Technic Axle 7Technic Axles	Light Bluish Gray	30×
3707	Technic Axle 8Technic Axles	Black	7×
32525	Technic Beam 1 x 11 ThickTechnic Beams	Light Bluish Gray	6×
32525	Technic Beam 1 x 11 ThickTechnic Beams	Yellow	3×
32009	Technic Beam 1 x 11.5 Double Bent ThickTechnic Beams	Black	2×
32009	Technic Beam 1 x 11.5 Double Bent ThickTechnic Beams	Dark Bluish Gray	8×
32009	Technic Beam 1 x 11.5 Double Bent ThickTechnic Beams	Yellow	1×
41239	Technic Beam 1 x 13 ThickTechnic Beams	Black	14×
41239	Technic Beam 1 x 13 ThickTechnic Beams	Light Bluish Gray	2×
41239	Technic Beam 1 x 13 ThickTechnic Beams	Yellow	7×
32278	Technic Beam 1 x 15 ThickTechnic Beams	Black	6×
32278	Technic Beam 1 x 15 ThickTechnic Beams	Light Bluish Gray	19×
32278	Technic Beam 1 x 15 ThickTechnic Beams	Yellow	8×
43857	Technic Beam 1 x 2 ThickTechnic Beams	Black	2×
43857	Technic Beam 1 x 2 ThickTechnic Beams	Blue	2×
43857	Technic Beam 1 x 2 ThickTechnic Beams	Light Bluish Gray	1×
43857	Technic Beam 1 x 2 ThickTechnic Beams	Yellow	2×
41677	Technic Beam 1 x 2 ThinTechnic Beams	Black	2×
41677	Technic Beam 1 x 2 ThinTechnic Beams	Dark Bluish Gray	6×
41677	Technic Beam 1 x 2 ThinTechnic Beams	Light Bluish Gray	4×
41677	Technic Beam 1 x 2 ThinTechnic Beams	Red	12×
32523	Technic Beam 1 x 3 ThickTechnic Beams	Dark Bluish Gray	12×
32523	Technic Beam 1 x 3 ThickTechnic Beams	Light Bluish Gray	2×
32523	Technic Beam 1 x 3 ThickTechnic Beams	Yellow	7×
6632	Technic Beam 1 x 3 ThinTechnic Beams	Light Bluish Gray	15×
6632	Technic Beam 1 x 3 ThinTechnic Beams	Yellow	2×
32449	Technic Beam 1 x 4 ThinTechnic Beams	Light Bluish Gray	17×
32449	Technic Beam 1 x 4 ThinTechnic Beams	Yellow	4×
32316	Technic Beam 1 x 5 ThickTechnic Beams	Black	1×
32316	Technic Beam 1 x 5 ThickTechnic Beams	Light Bluish Gray	24×
32316	Technic Beam 1 x 5 ThickTechnic Beams	Yellow	18×
32017	Technic Beam 1 x 5 ThinTechnic Beams	Light Bluish Gray	2×
32348	Technic Beam 1 x 7 Bent (4 - 4) ThickTechnic Beams	Light Bluish Gray	2×
32524	Technic Beam 1 x 7 ThickTechnic Beams	Light Bluish Gray	29×
32524	Technic Beam 1 x 7 ThickTechnic Beams	Yellow	10×
32065	Technic Beam 1 x 7 ThinTechnic Beams	Black	1×
32065	Technic Beam 1 x 7 ThinTechnic Beams	Yellow	1×
6629	Technic Beam 1 x 9 Bent (6 - 4) ThickTechnic Beams	Black	3×
6629	Technic Beam 1 x 9 Bent (6 - 4) ThickTechnic Beams	Yellow	3×
32271	Technic Beam 1 x 9 Bent (7 - 3) ThickTechnic Beams	Yellow	3×
40490	Technic Beam 1 x 9 ThickTechnic Beams	Black	2×
40490	Technic Beam 1 x 9 ThickTechnic Beams	Dark Bluish Gray	11×
40490	Technic Beam 1 x 9 ThickTechnic Beams	Light Bluish Gray	1×
40490	Technic Beam 1 x 9 ThickTechnic Beams	Yellow	4×
32140	Technic Beam 2 x 4 L-Shape ThickTechnic Beams	Black	2×
32140	Technic Beam 2 x 4 L-Shape ThickTechnic Beams	Blue	3×
32140	Technic Beam 2 x 4 L-Shape ThickTechnic Beams	Dark Bluish Gray	32×
32140	Technic Beam 2 x 4 L-Shape ThickTechnic Beams	Yellow	6×
32056	Technic Beam 3 x 3 L-Shape ThinTechnic Beams	Blue	14×
32526	Technic Beam 3 x 5 L-Shape ThickTechnic Beams	Black	8×
32526	Technic Beam 3 x 5 L-Shape ThickTechnic Beams	Blue	6×
32526	Technic Beam 3 x 5 L-Shape ThickTechnic Beams	Light Bluish Gray	11×
32526	Technic Beam 3 x 5 L-Shape ThickTechnic Beams	Yellow	4×
32250	Technic Beam 3 x 5 L-Shape with Quarter Ellipse ThinTechnic Beams	Black	6×
32251	Technic Beam 5 x 7 L-Shape with Quarter Ellipse ThinTechnic Beams	Black	4×
2905	Technic Beam Triangle Thin [Type I]Technic Beams	Black	14×
33299a	Technic Beam 3 x 0.5 Liftarm with Boss and Pin / CrankTechnic Beams Special	Black	4×
6541	Technic Brick 1 x 1 with Pin HoleTechnic Bricks	Yellow	2×
32018	Technic Brick 1 x 14 [13 Pin Holes]Technic Bricks	Black	2×
32018	Technic Brick 1 x 14 [13 Pin Holes]Technic Bricks	Yellow	5×
3703	Technic Brick 1 x 16 [15 Pin Holes]Technic Bricks	Dark Bluish Gray	2×
3703	Technic Brick 1 x 16 [15 Pin Holes]Technic Bricks	Yellow	16×
32064b	Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening]Technic Bricks	Yellow	2×
3701	Technic Brick 1 x 4 [3 Pin Holes]Technic Bricks	Yellow	4×
3894	Technic Brick 1 x 6 [5 Pin Holes]Technic Bricks	Yellow	4×
3702	Technic Brick 1 x 8 [7 Pin Holes]Technic Bricks	Yellow	4×
32333	Technic Pin Connector Block 1 x 5 x 3Technic Bricks	Light Bluish Gray	2×
2744	Technic Slope Long 1 x 6 with 3 Pin HolesTechnic Bricks	Yellow	6×
3713	Technic BushTechnic Bushes	Black	17×
3713	Technic BushTechnic Bushes	Light Bluish Gray	52×
32123b	Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedTechnic Bushes	Light Bluish Gray	30×
32123b	Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedTechnic Bushes	Yellow	4×
6553	Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle)Technic Connectors	Black	2×
6538b	Technic Axle Connector Ridged [with x Hole x Orientation]Technic Connectors	Black	15×
6538b	Technic Axle Connector Ridged [with x Hole x Orientation]Technic Connectors	Light Bluish Gray	27×
32039	Technic Axle Connector with Axle HoleTechnic Connectors	Black	2×
32039	Technic Axle Connector with Axle HoleTechnic Connectors	Yellow	6×
32013	Technic Axle and Pin Connector Angled #1Technic Connectors	Black	1×
32013	Technic Axle and Pin Connector Angled #1Technic Connectors	Light Bluish Gray	8×
32013	Technic Axle and Pin Connector Angled #1Technic Connectors	Yellow	12×
32034	Technic Axle and Pin Connector Angled #2 - 180°Technic Connectors	Black	5×
32034	Technic Axle and Pin Connector Angled #2 - 180°Technic Connectors	Light Bluish Gray	2×
32016	Technic Axle and Pin Connector Angled #3 - 157.5°Technic Connectors	Black	2×
32015	Technic Axle and Pin Connector Angled #5 - 112.5°Technic Connectors	Black	2×
6536	Technic Axle and Pin Connector PerpendicularTechnic Connectors	Black	17×
6536	Technic Axle and Pin Connector PerpendicularTechnic Connectors	Dark Bluish Gray	8×
6536	Technic Axle and Pin Connector PerpendicularTechnic Connectors	Light Bluish Gray	18×
6536	Technic Axle and Pin Connector PerpendicularTechnic Connectors	Yellow	34×
42003	Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesTechnic Connectors	Light Bluish Gray	19×
42003	Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesTechnic Connectors	Yellow	3×
32184	Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleTechnic Connectors	Black	28×
32184	Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleTechnic Connectors	Light Bluish Gray	7×
32291	Technic Axle and Pin Connector Perpendicular DoubleTechnic Connectors	Black	2×
41678	Technic Axle and Pin Connector Perpendicular Double SplitTechnic Connectors	Yellow	2×
48989	Technic Pin Connector Hub Perpendicular 3L with 4 PinsTechnic Connectors	Light Bluish Gray	14×
32529	Technic Pin Connector Plate with One Hole (Single on Bottom)Technic Connectors	Black	2×
75535	Technic Pin Connector Round [No Slot]Technic Connectors	Black	2×
6539	Technic Driving Ring 2L, 4 RidgesTechnic Gears	Red	1×
6589	Technic Gear 12 Tooth BevelTechnic Gears	Light Bluish Gray	5×
32270	Technic Gear 12 Tooth Double BevelTechnic Gears	Light Bluish Gray	5×
6542a	Technic Gear 16 Tooth with Clutch [Toothed]Technic Gears	Dark Bluish Gray	5×
4019	Technic Gear 16 Tooth with Round Holes [Old Style]Technic Gears	Light Bluish Gray	8×
32198	Technic Gear 20 Tooth BevelTechnic Gears	Light Bluish Gray	1×
32269	Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening]Technic Gears	Light Bluish Gray	5×
76244	Technic Gear 24 Tooth Clutch with Dark Bluish Gray CenterTechnic Gears	White	2×
3650c	Technic Gear 24 Tooth Crown with Reinforcements [New Style]Technic Gears	Light Bluish Gray	1×
3648b	Technic Gear 24 Tooth [New Style with Single Axle Hole]Technic Gears	Light Bluish Gray	1×
32498	Technic Gear 36 Tooth Double BevelTechnic Gears	Black	1×
3647	Technic Gear 8 ToothTechnic Gears	Light Bluish Gray	11×
6573	Technic Gear Differential, 24 -16 Tooth with Clutch on Both SidesTechnic Gears	Dark Bluish Gray	1×
3743	Technic Gear Rack 1 x 4Technic Gears	Light Bluish Gray	9×
32072	Technic Knob WheelTechnic Gears	Yellow	4×
50163	Technic Turntable Large Type 2, 24/56 Tooth with Black Outside Gear Section [Complete Assembly]Technic Gears	Dark Bluish Gray	1×
4716	Technic Worm GearTechnic Gears	Black	1×
4716	Technic Worm GearTechnic Gears	Light Bluish Gray	1×
43093	Technic Axle Pin with Friction Ridges LengthwiseTechnic Pins	Blue	106×
3749	Technic Axle Pin without Friction Ridges LengthwiseTechnic Pins	Tan	2×
4274	Technic Pin 1/2 without Friction RidgesTechnic Pins	Light Bluish Gray	20×
32002	Technic Pin 3/4Technic Pins	Dark Bluish Gray	12×
32138	Technic Pin Double with Axle HoleTechnic Pins	Black	1×
32138	Technic Pin Double with Axle HoleTechnic Pins	Light Bluish Gray	3×
32054	Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]Technic Pins	Black	4×
32054	Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]Technic Pins	Light Bluish Gray	17×
32054	Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]Technic Pins	Yellow	29×
6558	Technic Pin Long with Friction Ridges Lengthwise, 2 Center SlotsTechnic Pins	Black	158×
32556a	Technic Pin Long without Friction Ridges - Single SlotTechnic Pins	Light Bluish Gray	13×
2780	Technic Pin with Friction Ridges Lengthwise and Center SlotsTechnic Pins	Black	234×
6641	Technic Changeover Catch - + OpeningTechnic Special	Red	1×
32124	Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle HoleTechnic Special	Black	4×
2852	Technic Engine Connecting RodTechnic Steering, Suspension and Engine	Light Bluish Gray	6×
2853	Technic Engine CrankshaftTechnic Steering, Suspension and Engine	Light Bluish Gray	2×
2854	Technic Engine Crankshaft CenterTechnic Steering, Suspension and Engine	Dark Bluish Gray	2×
2850a	Technic Engine Cylinder with Side SlotsTechnic Steering, Suspension and Engine	Light Bluish Gray	6×
2851	Technic Engine Piston RoundTechnic Steering, Suspension and Engine	Yellow	6×
2819	Technic Steering Wheel Small (3 Studs Diameter)Technic Steering, Suspension and Engine	Light Bluish Gray	1×
3069b	Tile 1 x 2 with GrooveTiles	Yellow	4×
2431	Tile 1 x 4 with GrooveTiles	Black	1×
2431	Tile 1 x 4 with GrooveTiles	Yellow	2×
4162	Tile 1 x 8 with GrooveTiles	Yellow	14×
30622	Grille 1 x 4 [Two Pins]Transportation - Land	Yellow	2×
5102c16	Hose, Pneumatic 4mm D. 16LTubes and Hoses	Black	1×
5102c16	Hose, Pneumatic 4mm D. 16LTubes and Hoses	Blue	1×
4185	Technic Wedge Belt Wheel [aka Pulley]Wheels and Tyres	Black	2×
4185	Technic Wedge Belt Wheel [aka Pulley]Wheels and Tyres	Light Bluish Gray	3×
32019	Tyre 62.4 x 20Wheels and Tyres	Black	8×
32020	Wheel 43.2 x 18 with Extended Axle StemWheels and Tyres	Light Bluish Gray	8×
30155	Wheel Spoked 2 x 2 with Pin HoleWheels and Tyres	Black	2×
6141	Plate Round 1 x 1 with Solid StudPlates Round Curved and Dishes	Trans-Clear	2×	Spare
6141	Plate Round 1 x 1 with Solid StudPlates Round Curved and Dishes	Trans-Neon Orange	2×	Spare
6141	Plate Round 1 x 1 with Solid StudPlates Round Curved and Dishes	Trans-Red	1×	Spare
4697b	Pneumatic T-Piece (T Bar) [New Style]Pneumatics	Light Bluish Gray	1×	Spare
32278	Technic Beam 1 x 15 ThickTechnic Beams	Light Bluish Gray	1×	Spare
3713	Technic BushTechnic Bushes	Black	1×	Spare
3713	Technic BushTechnic Bushes	Light Bluish Gray	3×	Spare
32123b	Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedTechnic Bushes	Light Bluish Gray	4×	Spare
32123b	Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedTechnic Bushes	Yellow	1×	Spare
4274	Technic Pin 1/2 without Friction RidgesTechnic Pins	Light Bluish Gray	3×	Spare
32002	Technic Pin 3/4Technic Pins	Dark Bluish Gray	3×	Spare