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Cat D11 Bulldozer

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42131 Cat D11 Bulldozer

3,854 pieces in 231 part and color combinations.

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 1,498 pieces

  • Brick Round 2 x 2 D. Tube with 45° Elbow and Axle Holes (Crossholes) at Each End [SHORT] Black Part 65473 Element 6305216 ×2
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×24
  • Brick Round 2 x 2, Pin Holes Black Part 17485 Element 6536593 or 6195273 ×6
  • Dish 3 x 3 Inverted [Radar] Black Part 43898 Element 4180087 ×2
  • Plate 1 x 1 Black Part 3024 Element 302426 1 spare in the box ×1
  • Plate 1 x 3 Black Part 3623 Element 362326 ×1
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×2
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×16
  • Plate Special 1 x 2 with Pin Hole Underneath Black Part 18677 Element 6192309 or 6167497 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×5
  • Technic Axle 16 Black Part 50451 Element 6317564 or 6043747 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×26
  • Technic Axle 8 Black Part 3707 Element 370726 ×11
  • Technic Axle Connector Smooth [with x Hole + Orientation] Black Part 59443 Element 6084612 or 4512363 Also in Dark Bluish Gray ×61
  • Technic Axle Connector with Axle Hole [Reinforced] Black Part 42135 Element 6331716 Also in Dark Bluish Gray ×8
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Black Part 18651 Element 6089119 ×23
  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×41
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×16
  • Technic Axle and Pin Connector Angled #6 - 90° Black Part 32014 Element 6268905 or 4107767 ×11
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black Part 42003 Element 6273708 or 4200326 ×40
  • Technic Axle and Pin Connector Perpendicular Double Black Part 32291 Element 6280394 or 4140430 ×9
  • Technic Axle and Pin Connector Perpendicular Double Split [Reinforced] Black Part 69819 Element 6349281 ×8
  • Technic Axle and Pin Connector Perpendicular Split Black Part 92907 Element 6279021 or 4610371 ×2
  • Technic Beam 1 x 11 Thick with Alternating Holes Black Part 73507 Element 6330585 ×22
  • Technic Beam 1 x 13 Thick Black Part 41239 Element 4522933 or 4164422 Also in Dark Bluish Gray ×3
  • Technic Beam 1 x 15 Thick Black Part 32278 Element 4542573 or 4128603 ×8
  • Technic Beam 1 x 15 Thick with Alternating Holes Black Part 71710 Element 6321716 ×18
  • Technic Beam 1 x 2 Thick Black Part 43857 Element 4385726 or 4177444 ×12
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black Part 60483 Element 6265091 or 6006140 ×38
  • Technic Beam 1 x 2 Thin Black Part 41677 Element 6338428 or 4167726 ×50
  • Technic Beam 1 x 3 Thick Black Part 32523 Element 4142822 or 3252326 Also in Dark Bluish Gray ×9
  • Technic Beam 1 x 3 Thin Black Part 6632 Element 6331723 or 4107828 ×4
  • Technic Beam 1 x 4 Thin Black Part 32449 Element 6327548 or 4142236 ×22
  • Technic Beam 1 x 5 Thick Black Part 32316 Element 4142135 or 4140429 ×7
  • Technic Beam 1 x 5 Thin with Axle Holes on Ends Black Part 11478 Element 6327028 or 6030286 ×14
  • Technic Beam 1 x 6 Thin Black Part 32063 Element 6163980 or 4114634 ×8
  • Technic Beam 1 x 7 Bent (4 - 4) Thick Black Part 32348 Element 6278125 or 4128593 ×2
  • Technic Beam 1 x 7 Thick Black Part 32524 Element 4495935 or 4155458 ×17
  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×7
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×18
  • Technic Beam 3 x 3 L-Shape Thin Black Part 32056 Element 6271810 or 4112287 ×2
  • Technic Beam 3 x 5 L-Shape Thick Black Part 32526 Element 4142823 or 3252626 ×10
  • Technic Beam Frame 7 x 11 Black Part 39794 Element 6265643 ×1
  • Technic Connector Beam 3 x 3 Black Part 39793 Element 6265644 ×6
  • Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls] Black Part 42195 Element 6286381 ×2
  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×17
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Black Part 18575 Element 6346535 or 6093977 ×3
  • Technic Gear Rack 1 x 13 with Axle and Pin Holes Black Part 64781 Element 6302830 or 4540906 ×8
  • Technic Linear Actuator with Dark Bluish Gray Ends [Black Version] Black Part 43097 Element 6530015 or 6368625 ×6
  • Technic Panel 3 x 11 x 1 Black Part 15458 Element 6080356 ×8
  • Technic Panel 3 x 7 x 1 Black Part 71709 Element 6331935 ×6
  • Technic Panel 5 x 11 x 1 Tapered Black Part 18945 Element 6164383 ×8
  • Technic Panel Fairing #21 5L Small Smooth, Side B Black Part 11946 Element 6316923 or 6023036 ×2
  • Technic Panel Fairing #22 5L Small Smooth, Side A Black Part 11947 Element 6319983 or 6022761 ×2
  • Technic Pin Connector Block 1 x 5 x 3 Black Part 32333 Element 6271358 or 4141810 ×2
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Black Part 65487 Element 6282140 ×12
  • Technic Pin Connector Perpendicular 2 x 2 Bent Black Part 44809 Element 6325982 or 4480926 ×2
  • Technic Pin Connector Round 1L [Beam] Black Part 18654 Element 6121485 2 spares in the box ×61
  • Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes Black Part 87408 Element 6278412 or 4558692 ×4
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 6 spares in the box ×707
  • Technic Turntable Small Base, 28 Tooth Black Part 99010 Element 6326620 or 4652236 ×4
  • Tile 1 x 3 Black Part 63864 Element 4558170 ×1
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×4
  • Tile Special Round 2 x 2 with Hole Black Part 15535 Element 6143850 ×16
  • Tyre 14 x 6 Solid Smooth Black Part 50951 Element 4246901 ×24

Yellow 828 pieces

  • Plate Special 4 x 4, Studs on One Edge Plain] Yellow Part 6179 Element 4525895 or 617924 ×1
  • Technic Axle 5 Yellow Part 32073 Element 6130008 ×44
  • Technic Axle 9 Yellow Part 60485 Element 6130010 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Yellow Part 42003 Element 6273711 or 4200324 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Yellow Part 32184 Element 6276974 or 6037676 ×18
  • Technic Beam 1 x 11 Thick Yellow Part 32525 Element 6028107 or 4534912 ×18
  • Technic Beam 1 x 11.5 Double Bent Thick Yellow Part 32009 Element 6271150 or 6257104 ×4
  • Technic Beam 1 x 15 Thick Yellow Part 32278 Element 4542579 or 4237445 ×20
  • Technic Beam 1 x 2 Thick Yellow Part 43857 Element 4187122 ×30
  • Technic Beam 1 x 3 Thick Yellow Part 32523 Element 4153707 ×35
  • Technic Beam 1 x 3 Thin Yellow Part 6632 Element 6344174 or 4107823 ×27
  • Technic Beam 1 x 5 Thick Yellow Part 32316 Element 4142133 or 4128590 ×30
  • Technic Beam 1 x 5 Thin with Axle Holes on Ends Yellow Part 11478 Element 6371968 ×35
  • Technic Beam 1 x 6 Thin Yellow Part 32063 Element 6170294 or 6063252 ×14
  • Technic Beam 1 x 7 Thick Yellow Part 32524 Element 4495934 or 4187082 ×45
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Yellow Part 6629 Element 6524459 or 6375945 ×11
  • Technic Beam 1 x 9 Thick Yellow Part 40490 Element 6115616 or 4187136 ×9
  • Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick Yellow Part 71708 Element 6332412 ×6
  • Technic Beam 2 x 4 L-Shape Thick Yellow Part 32140 Element 6271828 or 4141628 ×49
  • Technic Beam 3 x 3 L-Shape Thin Yellow Part 32056 Element 6271812 or 4112289 ×3
  • Technic Beam 3 x 3 T-Shape Thick Yellow Part 60484 Element 6072627 ×11
  • Technic Beam 3 x 5 L-Shape Thick Yellow Part 32526 Element 4144022 ×30
  • Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Yellow Part 14720 Element 6259054 ×3
  • Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Yellow Part 64179 Element 6352947 ×4
  • Technic Beam Triangle Thin [Type II] Yellow Part 99773 Element 6331435 or 6010863 ×20
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 2 spares in the box ×34
  • Technic Connector Beam 3 x 3 Yellow Part 39793 Element 6252654 ×9
  • Technic Driving Ring Extension, 8 Ridges Yellow Part 35186 Element 6211768 ×2
  • Technic Engine Crankshaft Yellow Part 2853 Element 6640378 or 4119474 ×2
  • Technic Engine Piston Round Yellow Part 2851 Element 4112203 or 285124 ×12
  • Technic Link Tread 7L Wide with Two Pin Holes Yellow Part 69910 Element 6321711 3 spares in the box ×116
  • Technic Panel 3 x 11 x 1 Yellow Part 15458 Element 6143847 ×16
  • Technic Panel 3 x 7 x 1 Yellow Part 71709 Element 6334490 ×15
  • Technic Panel 5 x 11 x 1 Yellow Part 64782 Element 6311003 or 6038636 ×6
  • Technic Panel 5 x 11 x 1 Tapered Yellow Part 18945 Element 6310998 or 6099546 ×6
  • Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel Surface Yellow Part 11954 Element 6251202 or 6022952 ×4
  • 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
  • Technic Panel Fairing #21 5L Small Smooth, Side B Yellow Part 11946 Element 6352653 or 6251190 ×2
  • Technic Panel Fairing #22 5L Small Smooth, Side A Yellow Part 11947 Element 6352686 or 6251191 ×2
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Yellow Part 65487 Element 6282151 ×72
  • Technic Pin Connector Round [Slotted] Yellow Part 62462 Element 6173122 or 4526983 ×38
  • Technic Steering Arm 5 x 1 with Towball Socket (Type2) Yellow Part 31794 Element 6345163 ×2
  • Technic Tread Sprocket Wheel Large Diameter 7 Holes, 14 Tooth Yellow Part 42529 Element 6253463 ×6
  • Technic Wedge Belt Wheel [aka Pulley] Yellow Part 4185 Element 6636439 or 6363273 ×6
  • Wheel 31 x 15 Technic, 7 Pin Holes Yellow Part 60208 Element 6364403 or 6117014 ×1
  • Wire Clip with Axle Hole Yellow Part 49283 Element 6263069 ×2

Blue 573 pieces

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×150
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 3 spares in the box ×32
  • Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×390
  • Wire Clip with Axle Hole Blue Part 49283 Element 6263071 ×1

Light Bluish Gray 417 pieces

  • Brick Curved 2 x 1 No Studs [1/2 Bow] Light Bluish Gray Part 11477 Element 6028813 ×1
  • Brick Curved 2 x 2 x 2/3 Light Bluish Gray Part 15068 Element 6102357 ×1
  • Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Light Bluish Gray Part 25214 Element 6151349 ×6
  • Brick Sloped 30° 1 x 2 x 2/3 Light Bluish Gray Part 85984 Element 4568637 ×3
  • Hub, Powered Up 4-Port (Technic Control+) - Screw Opening Light Bluish Gray Part 85824 Element 6588258 or 6380608 ×1
  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×1
  • Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×2
  • Plate 2 x 12 Light Bluish Gray Part 2445 Element 4211360 ×2
  • Plate 2 x 14 Light Bluish Gray Part 91988 Element 4662161 ×1
  • Plate 3 x 3 Light Bluish Gray Part 11212 Element 6015347 ×1
  • Plate Special 1 x 2 with Pin Hole Underneath Light Bluish Gray Part 18677 Element 6168633 or 6089147 ×6
  • Plate Special 1 x 3 with 2 Studs with Groove and Inside Stud Holder (Jumper) Light Bluish Gray Part 34103 Element 6211969 ×1
  • Plate Special Round 2 x 2 with Center Stud (Jumper Plate) Light Bluish Gray Part 18674 Element 6183782 ×2
  • Technic Axle 11 Light Bluish Gray Part 23948 Element 6178172 ×7
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×98
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×14
  • Technic Axle Towball Light Bluish Gray Part 2736 Element 6443149 or 4211375 ×1
  • Technic Axle and Pin Connector Angled #1 Light Bluish Gray Part 32013 Element 6296859 or 4211550 ×4
  • 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 ×34
  • Technic Axle and Pin Connector Perpendicular Split Light Bluish Gray Part 92907 Element 6279023 or 4630114 ×2
  • Technic Axle and Pin Connector Perpendicular Triple Light Bluish Gray Part 63869 Element 6331441 or 4538007 ×15
  • Technic Beam 1 x 11 Thick Light Bluish Gray Part 32525 Element 4611705 or 4534910 ×5
  • Technic Beam 1 x 2 Thick Light Bluish Gray Part 43857 Element 4211862 ×4
  • Technic Beam 1 x 3 Thick Light Bluish Gray Part 32523 Element 4211655 ×3
  • Technic Beam 1 x 4 Thin Light Bluish Gray Part 32449 Element 6370947 or 6074036 ×2
  • Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×12
  • Technic Beam 1 x 6 Thin Light Bluish Gray Part 32063 Element 6170293 or 4211586 ×4
  • Technic Beam 1 x 7 Bent (4 - 4) Thick Light Bluish Gray Part 32348 Element 6278129 or 4211668 ×1
  • Technic Beam 1 x 7 Thick Light Bluish Gray Part 32524 Element 4495930 or 4211665 ×2
  • Technic Beam 1 x 9 Thick Light Bluish Gray Part 40490 Element 6102449 or 4211866 ×8
  • Technic Beam 2 x 4 L-Shape Thick Light Bluish Gray Part 32140 Element 6271831 or 4211610 ×3
  • Technic Beam 3 x 3 L-Shape Thin Light Bluish Gray Part 32056 Element 6271815 or 4211574 ×4
  • Technic Beam 3 x 5 L-Shape Thick Light Bluish Gray Part 32526 Element 4211713 ×13
  • 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 ×3
  • Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×6
  • Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls] Light Bluish Gray Part 42195 Element 6273212 ×10
  • Technic Engine Connecting Rod Light Bluish Gray Part 2852 Element 6000018 or 4655728 ×12
  • Technic Engine Cylinder without Side Slots, with Bottom Slots Light Bluish Gray Part 2850b Element 6514436 or 6383961 ×12
  • Technic Gear 16 Tooth Reinforced [New Style] Light Bluish Gray Part 94925 Element 4640536 ×14
  • Technic Gear 20 Tooth Bevel with Pin Hole Light Bluish Gray Part 87407 Element 4558690 ×2
  • Technic Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Along Part) Light Bluish Gray Part 49130 Element 6313453 ×2
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes) Light Bluish Gray Part 65489 Element 6282158 ×4
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes] Light Bluish Gray Part 44874 Element 6321303 ×7
  • Technic Pin Connector Round 1L [Beam] Light Bluish Gray Part 18654 Element 6183784 1 spare in the box ×6
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] Light Bluish Gray Part 65304 Element 6321747 ×20
  • Technic Steering / CV Ball Joint Male 3L Light Bluish Gray Part 52731 Element 6262968 ×2
  • Technic Steering / CV Ball Joint, Cardan Ball with Cross Hole 3L Light Bluish Gray Part 77590 Element 6338424 ×2
  • Technic Steering Wheel Hub with Planetary Gear Reduction Light Bluish Gray Part 46490 Element 6365803 or 6324050 ×2
  • Technic Turntable Small Top Light Bluish Gray Part 99009 Element 4652235 ×4
  • Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×8
  • Tile 1 x 2 with Groove Light Bluish Gray Part 3069b Element 4211414 ×2
  • Tile 1 x 3 Light Bluish Gray Part 63864 Element 4558169 ×1
  • Tile 1 x 4 with Groove Light Bluish Gray Part 2431 Element 4211356 or 2431194 ×1
  • Tile 2 x 3 Light Bluish Gray Part 26603 Element 6171894 ×1
  • Tile 2 x 4 with Groove Light Bluish Gray Part 87079 Element 4560183 ×3
  • Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×24
  • Wheel 18 x 8 with Fake Bolts and Deep Spokes with Inner Ring Light Bluish Gray Part 13971 Element 6359807 or 6044729 ×2

Red 276 pieces

  • Dish 3 x 3 Inverted [Radar] Red Part 43898 Element 6365073 or 4179584 ×2
  • Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle Holes Red Part 98585 Element 6313596 ×6
  • Plate Round 1 x 1 with Solid Stud Red Part 6141 Element 614121 1 spare in the box ×2
  • Technic Axle 10 Red Part 3737 Element 6130005 or 4267858 ×2
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×104
  • Technic Axle 6 Red Part 3706 Element 6130002 or 4191526 ×7
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Red Part 11214 Element 6209519 ×84
  • Technic Beam 3 x 3 L-Shape Thin Red Part 32056 Element 6609332 or 6271816 ×1
  • Technic Bush Red Part 3713 Element 6271820 or 4227155 2 spares in the box ×20
  • Technic Gear 16 Tooth with Clutch on Both Sides Red Part 18946 Element 6100930 ×15
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] Red Part 65304 Element 6347789 ×26
  • Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole Red Part 66906 Element 6360104 ×5
  • Wire Clip with Axle Hole Red Part 49283 Element 6263067 ×2

Dark Bluish Gray 124 pieces

  • Clutch Inner Side with Axle Connector Dark Bluish Gray Part 46835 Element 6257337 ×1
  • Motor, Large Angular Position, Light Bluish Gray Housing, Black Wire Dark Bluish Gray Part 69730 Element 6384835 or 6317490 ×2
  • Motor, Large, Powered Up Dark Bluish Gray Part 22169 Element 6545732 or 6456189 ×2
  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×26
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×2
  • Technic Axle 8 with Stop Dark Bluish Gray Part 55013 Element 4499858 ×4
  • Technic Axle Connector Smooth [with x Hole + Orientation] Dark Bluish Gray Part 59443 Element 6084613 or 4516546 Also in Black ×22
  • Technic Axle Connector with Axle Hole [Reinforced] Dark Bluish Gray Part 42135 Element 6375679 Also in Black ×4
  • Technic Axle and Pin Connector Angled #4 - 135° Dark Bluish Gray Part 32192 Element 6262899 or 4210688 ×3
  • 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 ×9
  • Technic Beam 1 x 13 Thick Dark Bluish Gray Part 41239 Element 4522937 or 4261932 Also in Black ×11
  • Technic Beam 1 x 3 Thick Dark Bluish Gray Part 32523 Element 32523199 or 4210751 Also in Black ×16
  • Technic Beam 1 x 9 Bent (7 - 3) Thick Dark Bluish Gray Part 32271 Element 6276837 or 4281516 ×2
  • Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin Dark Bluish Gray Part 32250 Element 32250199 or 6327165 ×2
  • Technic Driving Ring 3L Dark Bluish Gray Part 18947 Element 6100931 ×2
  • 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 Gear Rack 1 x 14 x 2 Housing Dark Bluish Gray Part 18940 Element 6328090 ×2
  • Technic Gear Rack 1 x 14 x 2 with Axle and Pin Holes Dark Bluish Gray Part 18942 Element 6273338 or 6114979 ×2
  • Technic Pin Connector Hub with 2 Axles Dark Bluish Gray Part 27940 Element 6167281 ×6
  • Technic Steering / CV Ball Joint Female with 3L Axle Dark Bluish Gray Part 52730 Element 6261793 ×2
  • Technic Worm Gear Short Dark Bluish Gray Part 27938 Element 6170153 ×3

Tan 69 pieces

  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×7
  • Technic Engine Crankshaft Center Tan Part 2854 Element 6355727 or 6013937 ×5
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×18
  • Technic Gear 20 Tooth Bevel Tan Part 32198 Element 6031962 or 4514557 ×24
  • 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 1 spare in the box ×3
  • Technic Pin Long without Friction Ridges, with Anti-Roll Notch Tan Part 39888 Element 6321305 ×6

White 22 pieces

  • Clutch Outer Side with Axle Connector White Part 46834 Element 6257336 ×1
  • Technic Axle and Pin Connector Perpendicular Double White Part 32291 Element 6292916 or 6254266 ×2
  • Technic Beam 1 x 7 Thin White Part 32065 Element 6271584 or 6176554 ×1
  • Technic Pin Connector Round 1L [Beam] White Part 18654 Element 6550155 or 6177114 2 spares in the box ×18

Reddish Brown 21 pieces

  • Technic Axle 3 with Stop Reddish Brown Part 24316 Element 6135494 ×7
  • Technic Axle 5 with Stop Reddish Brown Part 15462 Element 6159763 ×14

Trans-Clear 10 pieces

  • Tile Round 1 x 1 Trans-Clear Part 98138 Element 6514191 or 6274738 1 spare in the box ×10

Orange 8 pieces

  • Gear Shifter Orange Part 35188 Element 6227330 ×1
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Orange Part 60483 Element 6265128 or 6057526 ×7

Dark Tan 4 pieces

  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×4

Flat Silver 2 pieces

  • Technic Pin Connector Round [Slotted] Flat Silver Part 62462 Element 6245499 or 6054858 ×2

Green 1 piece

  • Wire Clip with Axle Hole Green Part 49283 Element 6263072 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 42131-1 [No Color/Any Color] Part 77607 Element 6338502 ×1

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

When a piece really is missing

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