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Mobile Crane MK II

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42009 Mobile Crane MK II

2,607 pieces in 167 part and color combinations.

LEGO counts 2,606 pieces. This inventory comes from a separate parts catalog and lists 2,607; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

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Piece checklist

Technic Pins 959 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 10 spares in the box ×495
  • Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×14
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×113
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 4 spares in the box ×18
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×214
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Bluish Gray Part 32054 Element 4211865 ×64
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×8
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×7
  • Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 2 spares in the box ×15
  • Technic Pin Long without Friction Ridges Tan Part 32556 ×11

Technic Beams 579 pieces

  • Technic Beam 1 x 15 Thick Black Part 32278 Element 4542573 or 4128603 Also in Dark Bluish Gray ×11
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black Part 60483 Element 6265091 or 6006140 ×10
  • Technic Beam 1 x 2 Thin Black Part 41677 Element 6338428 or 4167726 ×16
  • Technic Beam 1 x 3 Thin Black Part 6632 Element 6331723 or 4107828 ×20
  • Technic Beam 1 x 5 Thick Black Part 32316 Element 4142135 or 4140429 ×2
  • Technic Beam 1 x 5 Thin with Axle Holes on Ends Black Part 11478 Element 6327028 or 6030286 ×12
  • Technic Beam 1 x 7 Thick Black Part 32524 Element 4495935 or 4155458 Also in Dark Bluish Gray ×1
  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×15
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×4
  • Technic Beam 3 x 5 L-Shape Thick Black Part 32526 Element 4142823 or 3252626 ×2
  • Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin Black Part 32250 Element 6327162 or 4128557 ×8
  • Technic Beam Triangle Thin [Type II] Black Part 99773 Element 6331437 or 6010864 ×4
  • Technic Beam 3 x 5 L-Shape Thick Blue Part 32526 Element 4158923 ×6
  • Technic Beam 1 x 11 Thick Dark Bluish Gray Part 32525 Element 4603472 or 4534914 ×28
  • Technic Beam 1 x 11.5 Double Bent Thick Dark Bluish Gray Part 32009 Element 6271155 or 4210668 ×2
  • Technic Beam 1 x 15 Thick Dark Bluish Gray Part 32278 Element 32278199 or 4542576 Also in Black ×18
  • Technic Beam 1 x 7 Bent (4 - 4) Thick Dark Bluish Gray Part 32348 Element 32348199 or 6278127 ×4
  • Technic Beam 1 x 7 Thick Dark Bluish Gray Part 32524 Element 4495931 or 4210752 Also in Black ×45
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Dark Bluish Gray Part 6629 Element 6279883 or 4210638 ×2
  • Technic Beam 3 x 3 T-Shape Thick Dark Bluish Gray Part 60484 Element 4552349 or 4535773 ×11
  • Technic Beam 1 x 13 Thick Light Bluish Gray Part 41239 Element 4522934 or 4156299 ×32
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Light Bluish Gray Part 60483 Element 6265089 or 6004888 ×47
  • Technic Beam 1 x 3 Thick Light Bluish Gray Part 32523 Element 4211655 ×25
  • Technic Beam 1 x 4 Thin with Stud Connector Light Bluish Gray Part 2825 Element 6331574 or 4211561 ×4
  • Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×24
  • Technic Beam 2 x 4 L-Shape Thick Light Bluish Gray Part 32140 Element 6271831 or 4211610 ×21
  • Technic Beam 3 x 5 L-Shape Thick Light Bluish Gray Part 32526 Element 4211713 ×12
  • Technic Beam 1 x 11 Thick Yellow Part 32525 Element 6028107 or 4534912 ×15
  • Technic Beam 1 x 11.5 Double Bent Thick Yellow Part 32009 Element 6271150 or 6257104 ×4
  • Technic Beam 1 x 13 Thick Yellow Part 41239 Element 4522935 or 4237328 ×1
  • Technic Beam 1 x 15 Thick Yellow Part 32278 Element 4542579 or 4237445 ×10
  • Technic Beam 1 x 2 Thick Yellow Part 43857 Element 4187122 ×8
  • Technic Beam 1 x 3 Thick Yellow Part 32523 Element 4153707 ×18
  • Technic Beam 1 x 3 Thin Yellow Part 6632 Element 6344174 or 4107823 ×22
  • Technic Beam 1 x 4 Thin Yellow Part 32449 Element 6327559 or 4199345 ×20
  • Technic Beam 1 x 5 Thick Yellow Part 32316 Element 4142133 or 4128590 ×14
  • Technic Beam 1 x 5 Thin Yellow Part 32017 Element 4503425 or 4199343 ×15
  • Technic Beam 1 x 7 Thick Yellow Part 32524 Element 4495934 or 4187082 ×15
  • Technic Beam 1 x 9 Thick Yellow Part 40490 Element 6115616 or 4187136 ×12
  • Technic Beam 2 x 4 L-Shape Thick Yellow Part 32140 Element 6271828 or 4141628 ×19
  • Technic Beam 3 x 5 L-Shape Thick Yellow Part 32526 Element 4144022 ×14
  • Technic Beam Triangle Thin [Type II] Yellow Part 99773 Element 6331435 or 6010863 ×6

Technic Connectors 309 pieces

  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×10
  • Technic Axle and Pin Connector Angled #5 - 112.5° Black Part 32015 Element 6271346 or 4107084 ×2
  • Technic Axle and Pin Connector Perpendicular Black Part 6536 Element 6261371 or 4173668 ×51
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black Part 42003 Element 6273708 or 4200326 ×21
  • Technic Axle and Pin Connector Perpendicular Triple Black Part 63869 Element 6362991 or 6007966 ×23
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] Black Part 87082 Element 4560174 ×35
  • Technic Pin Connector Plate with One Hole (Single on Bottom) Black Part 32529 Element 4144023 ×2
  • Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes Black Part 87408 Element 6278412 or 4558692 ×4
  • Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder] Dark Bluish Gray Part 61904 Element 6356106 or 4528038 ×2
  • Technic Axle and Pin Connector Perpendicular Double Dark Bluish Gray Part 32291 Element 6280395 or 4210655 ×1
  • Technic Pin Connector Hub with 2 Perpendicular Axles Dark Bluish Gray Part 10197 Element 6005331 ×4
  • Technic Axle Connector Smooth [with x Hole + Orientation] Light Bluish Gray Part 59443 Element 4512360 ×32
  • Technic Axle Connector with Axle Hole Light Bluish Gray Part 32039 Element 4211553 ×4
  • Technic Axle and Pin Connector Angled #2 - 180° Light Bluish Gray Part 32034 Element 6346487 or 4211567 ×14
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Light Bluish Gray Part 32184 Element 6276969 or 4211621 ×16
  • Technic Axle and Pin Connector Perpendicular Double Split Light Bluish Gray Part 41678 Element 4211889 ×8
  • Technic Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Across Part) Light Bluish Gray Part 55615 Element 4296059 ×8
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins Light Bluish Gray Part 48989 Element 4225033 ×10
  • Technic Pin Connector Perpendicular 2 x 2 Bent Light Bluish Gray Part 44809 Element 4211880 ×4
  • Technic Pin Connector Perpendicular Long Light Bluish Gray Part 32557 Element 4211714 ×1
  • Technic Axle Connector Smooth [with x Hole + Orientation] Red Part 59443 Element 4513174 ×8
  • Technic Axle and Pin Connector Angled #2 - 180° Red Part 32034 Element 6351572 or 4234429 ×2
  • Technic Axle Connector Ridged [with x Hole x Orientation] Tan Part 6538b Element 4207456 or 4140453 ×3
  • Technic Axle and Pin Connector Angled #1 Yellow Part 32013 Element 6329889 or 4107066 ×9
  • Technic Axle and Pin Connector Perpendicular Yellow Part 6536 Element 6261367 or 4173666 ×15
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Yellow Part 42003 Element 6273711 or 4200324 ×12
  • Technic Pin Connector Round [Slotted] Yellow Part 62462 Element 6173122 or 4526983 ×8

Technic Axles 300 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×7
  • Technic Axle 12 Black Part 3708 Element 370826 ×3
  • Technic Axle 16 Black Part 50451 Element 6317564 or 6043747 ×5
  • Technic Axle 32 Black Part 50450 Element 6210821 or 4233937 1 spare in the box ×1
  • Technic Axle 4 Black Part 3705 Element 370526 ×25
  • Technic Axle 6 Black Part 3706 Element 370626 1 spare in the box ×8
  • Technic Axle 8 Black Part 3707 Element 370726 2 spares in the box ×3
  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×28
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×11
  • Technic Axle 8 with Stop Dark Bluish Gray Part 55013 Element 4499858 ×13
  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×2
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×62
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 1 spare in the box ×29
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 1 spare in the box ×7
  • Technic Axle 9 Light Bluish Gray Part 60485 Element 4535768 ×10
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×76
  • Technic Axle 4 with Centre Stop Tan Part 99008 Element 4666999 ×10

Technic Gears 158 pieces

  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×23
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] Black Part 32269 Element 4177430 ×1
  • Technic Gear Rack 1 x 13 with Axle and Pin Holes Black Part 64781 Element 6302830 or 4540906 ×12
  • Technic Gear 16 Tooth with Clutch [Smooth] Dark Bluish Gray Part 6542b Element 6542199 or 4237267 ×16
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×3
  • Technic Gear 8 Tooth [Reinforced] Dark Bluish Gray Part 10928 Element 6631413 or 6012451 ×19
  • Technic Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Beveled Edge] Dark Bluish Gray Part 62821b Element 4562210 or 4525184 ×1
  • Technic Driving Ring Extension, 4 Ridges Light Bluish Gray Part 32187 Element 4278756 or 4209329 ×2
  • Technic Gear 16 Tooth Reinforced [New Style] Light Bluish Gray Part 94925 Element 4640536 ×27
  • Technic Gear 20 Tooth Bevel with Pin Hole Light Bluish Gray Part 87407 Element 4558690 ×3
  • Technic Gear Rack 1 x 4 Light Bluish Gray Part 3743 Element 6457283 or 4211450 ×10
  • Technic Turntable Large Type 2, 24/56 Tooth with Black Outside Gear Section [Complete Assembly] Light Bluish Gray Part 50163 Element 4624645 ×1
  • Technic Worm Gear Light Bluish Gray Part 4716 Element 4211510 ×2
  • Technic Driving Ring 2L, 4 Ridges Red Part 6539 Element 4278957 ×3
  • Technic Gear 8 Tooth No Friction Red Part 11955 Element 6036545 1 spare in the box ×4
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 3 spares in the box ×17
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] Tan Part 32269 Element 4514555 ×11
  • Technic Gear 24 Tooth Clutch with Dark Bluish Gray Center White Part 76244 Element 6198486 or 6036892 ×3

Technic Bushes 103 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 5 spares in the box ×68
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 3 spares in the box ×35

Wheels and Tyres 45 pieces

  • Tyre 14 x 6 Solid Smooth Black Part 50951 Element 4246901 ×5
  • Tyre 62.4 x 20 Black Part 32019 Element 6411639 or 4547373 ×10
  • Technic Wedge Belt Wheel [aka Pulley] Dark Bluish Gray Part 4185 Element 6321744 or 4587275 ×10
  • Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×5
  • Wheel 18 x 8 with Fake Bolts and Deep Spokes with Inner Ring Light Bluish Gray Part 13971 Element 6359807 or 6044729 ×3
  • Wheel 43.2 x 18 with Flush Axle Stem Light Bluish Gray Part 86652 Element 6507815 or 4551421 ×10
  • Technic Wedge Belt Wheel [aka Pulley] Yellow Part 4185 Element 6636439 or 6363273 ×2

Technic Steering, Suspension and Engine 33 pieces

  • Technic Engine Connecting Rod Light Bluish Gray Part 2852 Element 6000018 or 4655728 ×8
  • Technic Engine Crankshaft Light Bluish Gray Part 2853 Element 6640384 or 4211609 ×3
  • Technic Engine Cylinder without Side Slots, with Bottom Slots Light Bluish Gray Part 2850b Element 6514436 or 6383961 ×8
  • Technic Steering Wheel Small (3 Studs Diameter) Light Bluish Gray Part 2819 Element 4580510 or 4211578 ×1
  • Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×2
  • Technic Engine Crankshaft Center Tan Part 2854 Element 6355727 or 6013937 ×3
  • Technic Engine Piston Round Yellow Part 2851 Element 4112203 or 285124 ×8

Tiles 22 pieces

  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×5
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×11
  • Tile 1 x 2 with Groove Trans-Orange Part 3069b Element 6514225 or 6251306 ×2
  • Tile 1 x 6 with Groove Yellow Part 6636 Element 6388488 or 663624 ×4

Technic Bricks 19 pieces

  • Technic Brick 1 x 10 [9 Pin Holes] Black Part 2730 Element 273026 ×1
  • Technic Brick 1 x 16 [15 Pin Holes] Black Part 3703 Element 370326 ×9
  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×1
  • Technic Pin Connector Block 1 x 5 x 3 Light Bluish Gray Part 32333 Element 6271360 or 4205761 ×2
  • Technic Brick 1 x 6 [5 Pin Holes] Yellow Part 3894 Element 389424 ×6

Technic Panels 19 pieces

  • Technic Panel 5 x 11 x 1 Light Bluish Gray Part 64782 Element 6474925 or 4621555 ×1
  • Technic Panel 5 x 11 x 1 Yellow Part 64782 Element 6311003 or 6038636 ×4
  • Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel Surface Yellow Part 11954 Element 6251202 or 6022952 ×6
  • Technic Panel Fairing # 3 Small Smooth Long, Side A Yellow Part 64683 Element 6533795 or 6005195 ×2
  • Technic Panel Fairing # 4 Small Smooth Long, Side B Yellow Part 64391 Element 6533801 or 6005197 ×2
  • Technic Panel Fairing #1 Small Smooth Short, Side A Yellow Part 87080 Element 6252564 or 4558879 ×2
  • Technic Panel Fairing #2 Small Smooth Short, Side B Yellow Part 87086 Element 6252566 or 4558876 ×2

Plates Round Curved and Dishes 15 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box ×8
  • Plate Round 1 x 1 with Solid Stud Trans-Orange Part 6141 Element 6514059 or 6240227 1 spare in the box ×4
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 2 spares in the box ×3

Plates 13 pieces

  • Plate 1 x 3 Black Part 3623 Element 362326 ×3
  • Plate 2 x 3 Black Part 3021 Element 302126 ×2
  • Plate 1 x 2 Trans-Orange Part 3023 Element 6514005 or 6240217 ×2
  • Plate 1 x 6 Yellow Part 3666 Element 366624 ×6

Technic Special 13 pieces

  • Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Black Part 41669 Element 4540065 or 4177441 ×1
  • Technic Cam Dark Bluish Gray Part 6575 Element 6575199 or 4210759 ×4
  • Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange Axle Light Bluish Gray Part 92693 Element 6221464 or 4612100 ×4
  • Technic Linear Actuator with Dark Bluish Gray Ends [Improved Version] Light Bluish Gray Part 61927b Element 6153715 or 4638507 ×2
  • Technic Changeover Catch - + opening Red Part 6641 Element 6099696 or 4270473 ×2

Technic Beams Special 12 pieces

  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Black Part 33299a Element 4156980 ×3
  • Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×2
  • Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×7

String, Bands and Reels 3 pieces

  • String Cord Medium Thickness 250cm Black Part 14728c250 Element 6043668 ×1
  • String with End Studs 31L Overall Black Part 14226c31 Element 6510782 or 6096956 1 spare in the box ×2

Bricks Sloped 2 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Orange Part 54200 Element 6245265 or 4244369 1 spare in the box ×2

Electronics 2 pieces

  • Battery Box, Power Functions 4 x 11 x 7 with Orange Switch and Dark Bluish Gray Covers [Complete Assembly] Light Bluish Gray Part 58119 Element 4506078 ×1
  • Motor, Large, Power Functions with Dark Bluish Gray Bottom Light Bluish Gray Part 99499 Element 6263044 or 6211504 ×1

Stickers 1 piece

  • Sticker Sheet for Set 42009-1 [No Color/Any Color] Part 14262 Element 6037768 ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

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