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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Crawler Crane

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42042 Crawler Crane

1,400 pieces in 141 part and color combinations.

LEGO counts 1,401 pieces. This inventory comes from a separate parts catalog and lists 1,400; 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

Black 362 pieces

  • Bar 4L (Lightsaber Blade / Wand) Black Part 30374 Element 6116604 or 4140303 ×2
  • String Cord Poly, 1.2mm Thickness, 100cm Black Part 21474 Element 6116677 ×1
  • String Cord Poly, 1.2mm Thickness, 180cm Black Part 21478 Element 6116684 ×1
  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×10
  • Technic Axle 6 Black Part 3706 Element 370626 ×11
  • Technic Axle 8 Black Part 3707 Element 370726 ×3
  • Technic Axle Connector Smooth [with x Hole + Orientation] Black Part 59443 Element 6084612 or 4512363 ×4
  • Technic Axle Connector with Axle Hole Black Part 32039 Element 4107081 or 3203926 ×9
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×3
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black Part 42003 Element 6273708 or 4200326 ×10
  • Technic Axle and Pin Connector Perpendicular Split Black Part 92907 Element 6279021 or 4610371 ×6
  • Technic Beam 1 x 11 Thick Black Part 32525 Element 6029578 or 4534909 Also in Dark Bluish Gray ×3
  • Technic Beam 1 x 3 Thick Black Part 32523 Element 4142822 or 3252326 ×1
  • Technic Beam 1 x 3 Thin Black Part 6632 Element 6331723 or 4107828 ×4
  • Technic Beam 1 x 5 Thick Black Part 32316 Element 4142135 or 4140429 ×8
  • Technic Beam 1 x 5 Thin with Axle Holes on Ends Black Part 11478 Element 6327028 or 6030286 ×6
  • Technic Beam 1 x 6 Thin Black Part 32063 Element 6163980 or 4114634 ×16
  • Technic Beam Triangle Thin [Type II] Black Part 99773 Element 6331437 or 6010864 Also in Dark Bluish Gray ×2
  • Technic Brick 1 x 2 [2 Pin Holes] Black Part 32000 Element 3200026 ×4
  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×5
  • Technic Grabber Arm Claw with 3L Thick Beam [Type 2] Black Part 19540 Element 6100179 ×4
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise Black Part 15100 Element 6073231 ×2
  • Technic Pin Connector Perpendicular 2 x 2 Bent Black Part 44809 Element 6325982 or 4480926 ×5
  • Technic Pin Connector Perpendicular Long Black Part 32557 Element 4143466 ×4
  • Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes Black Part 87408 Element 6278412 or 4558692 ×3
  • Technic Pin Double Triangle 1 x 3 with 2 Clips Squared Pin Holes Black Part 19159 Element 6322258 or 6124733 ×1
  • Technic Pin Double with Axle Hole Black Part 32138 Element 4130597 or 4119589 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×36
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 4 spares in the box ×185
  • Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×4
  • Technic Tread Sprocket Wheel Large 10 Tooth Black Part 57519 Element 6526471 or 4582792 ×4
  • Technic Turntable Large Type 3 Top, 60 Tooth Black Part 18938 Element 6109283 ×1

Light Bluish Gray 328 pieces

  • Bar 3L Light Bluish Gray Part 87994 Element 6093527 or 6064033 1 spare in the box ×2
  • Battery Box, Power Functions 4 x 11 x 7 with Orange Switch and Dark Bluish Gray Covers [Complete Assembly] [New Version] Light Bluish Gray Part 16511 Element 6368436 or 6257768 ×1
  • Motor, Large, Power Functions with Dark Bluish Gray Bottom Light Bluish Gray Part 99499 Element 6263044 or 6211504 ×1
  • String Reel 2 x 1 x 2 Drum with Axle Hole Light Bluish Gray Part 61510 Element 4521532 ×1
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×40
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×14
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×3
  • Technic Axle 9 Light Bluish Gray Part 60485 Element 4535768 ×2
  • Technic Axle and Pin Connector Angled #5 - 112.5° Light Bluish Gray Part 32015 Element 6271347 or 4211551 ×2
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×8
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Light Bluish Gray Part 32184 Element 6276969 or 4211621 ×3
  • Technic Axle and Pin Connector Perpendicular Double Split Light Bluish Gray Part 41678 Element 4211889 ×4
  • Technic Axle and Pin Connector Perpendicular Triple Light Bluish Gray Part 63869 Element 6331441 or 4538007 ×14
  • Technic Beam 1 x 9 Thick Light Bluish Gray Part 40490 Element 6102449 or 4211866 ×7
  • Technic Beam 2 x 4 L-Shape Thick Light Bluish Gray Part 32140 Element 6271831 or 4211610 ×16
  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Light Bluish Gray Part 33299a Element 4211688 ×4
  • Technic Beam 3 x 3 T-Shape Thick Light Bluish Gray Part 60484 Element 4552348 or 4535772 ×12
  • Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×1
  • 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 ×2
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 4 spares in the box ×20
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 3 spares in the box ×26
  • Technic Gear 16 Tooth Reinforced [New Style] Light Bluish Gray Part 94925 Element 4640536 ×3
  • Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange Axle Light Bluish Gray Part 92693 Element 6221464 or 4612100 ×1
  • Technic Link 1 x 16 Light Bluish Gray Part 2637 Element 4211556 ×4
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 2 spares in the box ×14
  • Technic Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Across Part) Light Bluish Gray Part 55615 Element 4296059 ×2
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins Light Bluish Gray Part 48989 Element 4225033 ×11
  • Technic Pin Connector Round [Slotted] Light Bluish Gray Part 62462 Element 6173127 or 4526985 ×3
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Bluish Gray Part 32054 Element 4211865 ×50
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×16
  • Technic Turntable Large Type 3 Base Light Bluish Gray Part 18939 Element 6109285 ×1
  • Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×1
  • Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×4
  • Technic Worm Gear Light Bluish Gray Part 4716 Element 4211510 ×2
  • Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×28
  • Wheel 18 x 8 with Fake Bolts and Deep Spokes with Inner Ring Light Bluish Gray Part 13971 Element 6359807 or 6044729 ×1
  • Wheel 18mm x 14mm with Axle Hole, Fake Bolts and Shallow Spokes Light Bluish Gray Part 55982 Element 4490127 ×2

Blue 307 pieces

  • Plate 2 x 3 Blue Part 3021 Element 302123 ×6
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×39
  • Technic Axle and Pin Connector Toggle Joint Smooth Blue Part 32126 Element 6457113 or 6323908 ×2
  • Technic Beam 1 x 11 Thick Blue Part 32525 Element 6390388 or 6057859 ×5
  • Technic Beam 1 x 11.5 Double Bent Thick Blue Part 32009 Element 6271153 or 4112000 ×2
  • Technic Beam 1 x 15 Thick Blue Part 32278 Element 6057799 or 4144299 ×40
  • Technic Beam 1 x 3 Thick Blue Part 32523 Element 4509376 or 4144284 ×17
  • Technic Beam 1 x 3 Thin Blue Part 6632 Element 6344176 or 4107829 ×6
  • Technic Beam 1 x 7 Thick Blue Part 32524 Element 4506043 or 4144285 ×27
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Blue Part 6629 Element 6279882 or 4182884 ×4
  • Technic Beam 2 x 4 L-Shape Thick Blue Part 32140 Element 6271829 or 4168114 ×6
  • Technic Beam 3 x 5 L-Shape Thick Blue Part 32526 Element 4158923 ×7
  • Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel Surface Blue Part 11954 Element 6108906 ×4
  • Technic Panel Fairing #1 Small Smooth Short, Side A Blue Part 87080 Element 6330923 or 6057481 ×6
  • Technic Panel Fairing #2 Small Smooth Short, Side B Blue Part 87086 Element 6597522 or 6330922 ×5
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×129
  • Tile 1 x 4 with Groove Blue Part 2431 Element 243123 ×2

Dark Bluish Gray 251 pieces

  • Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate Dark Bluish Gray Part 61409 Element 4540386 or 4521185 ×8
  • Plate 2 x 4 Dark Bluish Gray Part 3020 Element 4211065 ×4
  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×14
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×4
  • Technic Axle 8 with Stop Dark Bluish Gray Part 55013 Element 4499858 ×5
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×18
  • Technic Beam 1 x 11 Thick Dark Bluish Gray Part 32525 Element 4603472 or 4534914 Also in Black ×8
  • Technic Beam 1 x 13 Thick Dark Bluish Gray Part 41239 Element 4522937 or 4261932 ×20
  • Technic Beam 1 x 15 Thick Dark Bluish Gray Part 32278 Element 32278199 or 4542576 ×5
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Dark Bluish Gray Part 60483 Element 6265093 or 6006141 ×23
  • Technic Beam 1 x 7 Thick Dark Bluish Gray Part 32524 Element 4495931 or 4210752 ×4
  • Technic Beam 3 x 3 T-Shape Thick Dark Bluish Gray Part 60484 Element 4552349 or 4535773 ×2
  • Technic Beam 3 x 5 L-Shape Thick Dark Bluish Gray Part 32526 Element 4210753 ×18
  • Technic Beam Triangle Thin [Type II] Dark Bluish Gray Part 99773 Element 6331431 or 6010862 Also in Black ×2
  • Technic Driving Ring 3L Dark Bluish Gray Part 18947 Element 6100931 ×4
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×4
  • Technic Gear 8 Tooth [Reinforced] Dark Bluish Gray Part 10928 Element 6631413 or 6012451 ×6
  • Technic Link Tread Wide with Two Pin Holes, Reinforced Dark Bluish Gray Part 88323 Element 4566742 ×90
  • Technic Pin Connector Round 1L [Beam] Dark Bluish Gray Part 18654 Element 6100030 3 spares in the box ×12

White 46 pieces

  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×2
  • Technic Axle and Pin Connector Angled #1 White Part 32013 Element 6332573 or 4118981 ×2
  • Technic Axle and Pin Connector Angled #5 - 112.5° White Part 32015 Element 6271349 or 6003297 ×2
  • Technic Beam 1 x 11.5 Double Bent Thick White Part 32009 Element 6271161 or 6004157 ×2
  • Technic Beam 1 x 13 Thick White Part 41239 Element 6634561 or 4620671 ×3
  • Technic Beam 1 x 2 Thin White Part 41677 Element 6371416 or 4163533 ×2
  • Technic Beam 1 x 3 Thick White Part 32523 Element 6632140 or 4208160 ×5
  • Technic Beam 1 x 4 Thin White Part 32449 Element 6360072 or 4144138 ×8
  • Technic Beam 1 x 7 Thick White Part 32524 Element 6564912 or 6318056 ×1
  • Technic Beam 1 x 9 Bent (7 - 3) Thick White Part 32271 Element 6276842 or 6004144 ×2
  • Technic Beam 3 x 5 L-Shape Thick White Part 32526 Element 6632144 or 4585040 ×5
  • Technic Driving Ring Connector White Part 18948 Element 6276052 or 6100932 ×6
  • Technic Gear 24 Tooth Clutch with Dark Bluish Gray Center White Part 76244 Element 6198486 or 6036892 ×2
  • Technic Panel 3 x 11 x 1 White Part 15458 Element 6055627 ×2
  • Tile 2 x 4 with Groove White Part 87079 Element 6548271 or 4560178 ×2

Red 40 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×15
  • Technic Axle Connector Smooth [with x Hole + Orientation] Red Part 59443 Element 4513174 ×12
  • Technic Changeover Catch - + opening Red Part 6641 Element 6099696 or 4270473 ×2
  • Technic Gear 16 Tooth with Clutch on Both Sides Red Part 18946 Element 6100930 ×11

Tan 38 pieces

  • Technic Axle 4 with Centre Stop Tan Part 99008 Element 4666999 ×5
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×4
  • Technic Gear 20 Tooth Bevel Tan Part 32198 Element 6031962 or 4514557 ×4
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Tan Part 18575 Element 6346517 or 6084724 ×6
  • Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 2 spares in the box ×4
  • Technic Pin Long without Friction Ridges Tan Part 32556 ×15

Dark Tan 17 pieces

  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×6
  • Technic Axle 5 with Stop Dark Tan Part 15462 Element 6055631 ×11

Trans-Clear 3 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box ×3

Yellow 3 pieces

  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×2
  • Technic Pin Connector Round [Slotted] Yellow Part 62462 Element 6173122 or 4526983 ×1

Trans-Orange 2 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Orange Part 6141 Element 6514059 or 6240227 1 spare in the box ×2

Dark Blue 1 piece

  • Flag 7 x 3 with Rod Dark Blue Part 30292 Element 6337613 or 6284172 ×1

Flat Silver 1 piece

  • Technic Axle and Pin Connector, Perpendicular with Extension Flat Silver Part 53586 Element 6395637 or 6323657 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 42042-1 [No Color/Any Color] Part 20874 Element 6109479 ×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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