# LEGO 42131-1 — Cat D11 Bulldozer (2021)

Source: https://www.brickmissing.com/sets/42131-1-cat-d11-bulldozer
Publisher: BrickMissing (https://www.brickmissing.com) — free LEGO parts checker. Not affiliated with the LEGO Group.

The LEGO Technic App-Controlled Cat D11 Bulldozer (42131-1), a 3854-piece model from 2021, replicates the Cat D11 dozer. Its construction uses modular sections, mirroring the actual machine's assembly. A new large track element features in the set, designed for adjustable tension. Control of the bulldozer is achieved via the CONTROL+ app. This app facilitates movement, allowing driving, steering, and manipulation of the blade to raise, lower, and tilt it. The ripper and ladder also raise and lower, showcasing realistic engineering functions. This model provides an exploration of construction technology.

## Set facts

- Set number: 42131-1
- Name: Cat D11 Bulldozer
- Theme: Technic › Licensed
- Released: 2021
- Pieces: 3854
- Distinct part + colour lots: 231
- Build difficulty: expert
- Repairability: 3.0% of this set's lots are hard to replace (7 of 231 part+colour combinations appear in three or fewer sets in the entire LEGO catalog).

## Complete parts list (231 lots, 3854 pieces)

Prices are the official LEGO Pick a Brick price per individual part, where LEGO publishes one.

| Qty | Part | Colour | Part no. | LEGO element ID | LEGO price each |
| ---: | --- | --- | --- | --- | --- |
| 1 | Plate 3 x 3 | Light Bluish Gray | 11212 | 6015347 | €0,12 |
| 84 | Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle | Red | 11214 | 6209519 | €0,29 |
| 1 | Slope Curved 2 x 1 No Studs [1/2 Bow] | Light Bluish Gray | 11477 | 6028813 | €0,06 |
| 14 | Technic Beam 1 x 5 Thin with Axle Holes on Ends | Black | 11478 | 6327028 | €0,25 |
| 35 | Technic Beam 1 x 5 Thin with Axle Holes on Ends | Yellow | 11478 | 6371968 | €0,25 |
| 2 | Technic Panel Fairing #21 5L Small Smooth, Side B | Black | 11946 | 6316923 | €0,38 |
| 2 | Technic Panel Fairing #21 5L Small Smooth, Side B | Yellow | 11946 | 6352653 | €0,38 |
| 2 | Technic Panel Fairing #22 5L Small Smooth, Side A | Black | 11947 | 6319983 | €0,38 |
| 2 | Technic Panel Fairing #22 5L Small Smooth, Side A | Yellow | 11947 | 6352686 | €0,38 |
| 4 | Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel Surface | Yellow | 11954 | 6022952 | — |
| 2 | Wheel 18 x 8 with Fake Bolts and Deep Spokes with Inner Ring | Light Bluish Gray | 13971 | 6044729 | €0,21 |
| 3 | Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] | Yellow | 14720 | 6259054 | €0,36 |
| 1 | Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] | Light Bluish Gray | 14720 | 6055519 | €0,36 |
| 1 | Slope Curved 2 x 2 x 2/3 | Light Bluish Gray | 15068 | 6102357 | €0,13 |
| 16 | Technic Panel 3 x 11 x 1 | Yellow | 15458 | 6143847 | €1,13 |
| 8 | Technic Panel 3 x 11 x 1 | Black | 15458 | 6080356 | €1,13 |
| 14 | Technic Axle 5 with Stop | Reddish Brown | 15462 | 6159763 | €0,11 |
| 16 | Tile Round 2 x 2 with Hole | Black | 15535 | 6143850 | €0,07 |
| 6 | Brick Round 2 x 2, Pin Holes | Black | 17485 | 6536593 | €0,24 |
| 6 | Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] | Tan | 18575 | 6346517 | €0,36 |
| 3 | Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] | Black | 18575 | 6346535 | €0,36 |
| 23 | Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle | Black | 18651 | 6089119 | €0,08 |
| 6 | Technic Pin Connector Round 1L [Beam] | Light Bluish Gray | 18654 | 6183784 | €0,05 |
| 18 | Technic Pin Connector Round 1L [Beam] | White | 18654 | 6177114 | €0,05 |
| 61 | Technic Pin Connector Round 1L [Beam] | Black | 18654 | 6121485 | €0,05 |
| 2 | Plate Special Round 2 x 2 with Center Stud (Jumper Plate) | Light Bluish Gray | 18674 | 6183782 | €0,07 |
| 2 | Plate Special 1 x 2 with Pin Hole Underneath | Black | 18677 | 6192309 | €0,07 |
| 6 | Plate Special 1 x 2 with Pin Hole Underneath | Light Bluish Gray | 18677 | 6168633 | €0,07 |
| 2 | Technic Gear Rack 1 x 14 x 2 Housing | Dark Bluish Gray | 18940 | 6328090 | — |
| 2 | Technic Gear Rack 1 x 14 x 2 with Axle and Pin Holes | Dark Bluish Gray | 18942 | 6114979 | — |
| 8 | Technic Panel 5 x 11 x 1 Tapered | Black | 18945 | 6164383 | €1,40 |
| 6 | Technic Panel 5 x 11 x 1 Tapered | Yellow | 18945 | 6310998 | €1,40 |
| 15 | Technic Gear 16 Tooth with Clutch on Both Sides | Red | 18946 | 6100930 | €0,42 |
| 2 | Technic Driving Ring 3L | Dark Bluish Gray | 18947 | 6100931 | €0,47 |
| 2 | Motor, Large, Powered Up | Dark Bluish Gray | 22169 | 6214085 | — |
| 7 | Technic Axle 11 | Light Bluish Gray | 23948 | 6178172 | €0,29 |
| 4 | Tile Special 1 x 2 Grille with Bottom Groove | Black | 2412b | 241226 | €0,06 |
| 2 | Plate 2 x 2 Corner | Black | 2420 | 242026 | €0,07 |
| 1 | Tile 1 x 4 with Groove | Light Bluish Gray | 2431 | 4211356 | €0,12 |
| 7 | Technic Axle 3 with Stop | Reddish Brown | 24316 | 6135494 | €0,07 |
| 2 | Plate 2 x 12 | Light Bluish Gray | 2445 | 4211360 | €0,36 |
| 6 | 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 | 25214 | 6151349 | €0,23 |
| 1 | Tile 2 x 3 | Light Bluish Gray | 26603 | 6171894 | €0,11 |
| 1 | Technic Axle Towball | Light Bluish Gray | 2736 | 4211375 | €0,13 |
| 3 | Technic Worm Gear Short | Dark Bluish Gray | 27938 | 6170153 | €0,68 |
| 6 | Technic Pin Connector Hub with 2 Axles | Dark Bluish Gray | 27940 | 6167281 | €0,17 |
| 12 | Technic Engine Cylinder without Side Slots, with Bottom Slots | Light Bluish Gray | 2850b | 6514436 | €0,59 |
| 12 | Technic Engine Piston Round | Yellow | 2851 | 4112203 | €0,18 |
| 12 | Technic Engine Connecting Rod | Light Bluish Gray | 2852 | 6000018 | €0,11 |
| 2 | Technic Engine Crankshaft | Yellow | 2853 | 4119474 | €0,16 |
| 5 | Technic Engine Crankshaft Center | Tan | 2854 | 6355727 | €0,19 |
| 1 | Plate 2 x 4 | Black | 3020 | 302026 | €0,15 |
| 1 | Plate 1 x 1 | Black | 3024 | 302426 | €0,06 |
| 2 | Tile 1 x 2 with Groove | Light Bluish Gray | 3069b | 4211414 | €0,07 |
| 2 | Technic Steering Arm 5 x 1 with Towball Socket (Type2) | Yellow | 31794 | 6345163 | — |
| 3 | Technic Pin 3/4 | Tan | 32002 | 6013938 | €0,08 |
| 4 | Technic Beam 1 x 11.5 Double Bent Thick | Yellow | 32009 | 6271150 | €0,39 |
| 4 | Technic Axle and Pin Connector Angled #1 | Light Bluish Gray | 32013 | 6296859 | €0,08 |
| 41 | Technic Axle and Pin Connector Angled #1 | Black | 32013 | 6284699 | €0,08 |
| 11 | Technic Axle and Pin Connector Angled #6 - 90° | Black | 32014 | 6268905 | €0,22 |
| 2 | Technic Axle and Pin Connector Angled #5 - 112.5° | Light Bluish Gray | 32015 | 6271347 | €0,21 |
| 16 | Technic Axle and Pin Connector Angled #2 - 180° | Black | 32034 | 6271869 | €0,11 |
| 2 | Technic Beam 3 x 3 L-Shape Thin | Black | 32056 | 6271810 | €0,31 |
| 1 | Technic Beam 3 x 3 L-Shape Thin | Red | 32056 | 4114741 | — |
| 3 | Technic Beam 3 x 3 L-Shape Thin | Yellow | 32056 | 6271812 | €0,31 |
| 4 | Technic Beam 3 x 3 L-Shape Thin | Light Bluish Gray | 32056 | 6271815 | €0,31 |
| 104 | Technic Axle 2 Notched | Red | 32062 | 4142865 | €0,07 |
| 14 | Technic Beam 1 x 6 Thin | Yellow | 32063 | 6170294 | €0,13 |
| 8 | Technic Beam 1 x 6 Thin | Black | 32063 | 6163980 | €0,13 |
| 4 | Technic Beam 1 x 6 Thin | Light Bluish Gray | 32063 | 6170293 | €0,13 |
| 1 | Technic Beam 1 x 7 Thin | White | 32065 | 4205157 | — |
| 44 | Technic Axle 5 | Yellow | 32073 | 6130008 | €0,11 |
| 34 | Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced | Yellow | 32123b | 6271167 | €0,04 |
| 49 | Technic Beam 2 x 4 L-Shape Thick | Yellow | 32140 | 6271828 | €0,15 |
| 18 | Technic Beam 2 x 4 L-Shape Thick | Black | 32140 | 6271825 | €0,15 |
| 3 | Technic Beam 2 x 4 L-Shape Thick | Light Bluish Gray | 32140 | 6271831 | €0,15 |
| 18 | Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole | Yellow | 32184 | 6276974 | €0,12 |
| 3 | Technic Axle and Pin Connector Angled #4 - 135° | Dark Bluish Gray | 32192 | 6262899 | €0,19 |
| 24 | Technic Gear 20 Tooth Bevel | Tan | 32198 | 6031962 | €0,56 |
| 2 | Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin | Dark Bluish Gray | 32250 | 32250199 | — |
| 17 | Technic Gear 12 Tooth Double Bevel | Black | 32270 | 4177431 | €0,18 |
| 2 | Technic Beam 1 x 9 Bent (7 - 3) Thick | Dark Bluish Gray | 32271 | 4210673 | — |
| 20 | Technic Beam 1 x 15 Thick | Yellow | 32278 | 4542579 | €0,42 |
| 8 | Technic Beam 1 x 15 Thick | Black | 32278 | 4542573 | €0,42 |
| 9 | Technic Axle and Pin Connector Perpendicular Double | Black | 32291 | 6280394 | €0,15 |
| 2 | Technic Axle and Pin Connector Perpendicular Double | White | 32291 | 6292916 | €0,15 |
| 12 | Technic Beam 1 x 5 Thick | Light Bluish Gray | 32316 | 4211651 | €0,19 |
| 7 | Technic Beam 1 x 5 Thick | Black | 32316 | 4142135 | €0,19 |
| 30 | Technic Beam 1 x 5 Thick | Yellow | 32316 | 4142133 | €0,19 |
| 2 | Technic Pin Connector Block 1 x 5 x 3 | Black | 32333 | 6271358 | €0,44 |
| 2 | Technic Beam 1 x 7 Bent (4 - 4) Thick | Black | 32348 | 6278125 | €0,27 |
| 1 | Technic Beam 1 x 7 Bent (4 - 4) Thick | Light Bluish Gray | 32348 | 6278129 | €0,27 |
| 2 | Technic Beam 1 x 4 Thin | Light Bluish Gray | 32449 | 6370947 | €0,19 |
| 22 | Technic Beam 1 x 4 Thin | Black | 32449 | 6327548 | €0,19 |
| 3 | Technic Beam 1 x 3 Thick | Light Bluish Gray | 32523 | 4211655 | €0,10 |
| 16 | Technic Beam 1 x 3 Thick | Dark Bluish Gray | 32523 | 4210751 | €0,10 |
| 9 | Technic Beam 1 x 3 Thick | Black | 32523 | 4142822 | €0,10 |
| 35 | Technic Beam 1 x 3 Thick | Yellow | 32523 | 4153707 | €0,10 |
| 17 | Technic Beam 1 x 7 Thick | Black | 32524 | 4495935 | €0,25 |
| 45 | Technic Beam 1 x 7 Thick | Yellow | 32524 | 4495934 | €0,25 |
| 2 | Technic Beam 1 x 7 Thick | Light Bluish Gray | 32524 | 4495930 | €0,25 |
| 18 | Technic Beam 1 x 11 Thick | Yellow | 32525 | 6028107 | €0,33 |
| 5 | Technic Beam 1 x 11 Thick | Light Bluish Gray | 32525 | 4611705 | €0,33 |
| 10 | Technic Beam 3 x 5 L-Shape Thick | Black | 32526 | 4142823 | €0,24 |
| 13 | Technic Beam 3 x 5 L-Shape Thick | Light Bluish Gray | 32526 | 4211713 | €0,24 |
| 30 | Technic Beam 3 x 5 L-Shape Thick | Yellow | 32526 | 4144022 | €0,24 |
| 1 | Plate Special 1 x 3 with 2 Studs with Groove and Inside Stud Holder (Jumper) | Light Bluish Gray | 34103 | 6211969 | €0,07 |
| 2 | Technic Driving Ring Extension, 8 Ridges | Yellow | 35186 | 6211768 | €0,22 |
| 1 | Gear Shifter | Orange | 35188 | 6227330 | — |
| 1 | Plate 1 x 3 | Black | 3623 | 362326 | €0,07 |
| 1 | Plate 1 x 3 | Light Bluish Gray | 3623 | 4211429 | €0,07 |
| 26 | Technic Axle 4 | Black | 3705 | 370526 | €0,08 |
| 7 | Technic Axle 6 | Red | 3706 | 6130002 | €0,12 |
| 11 | Technic Axle 8 | Black | 3707 | 370726 | €0,22 |
| 5 | Technic Axle 12 | Black | 3708 | 370826 | €0,27 |
| 2 | Plate 1 x 4 | Light Bluish Gray | 3710 | 4211445 | €0,12 |
| 20 | Technic Bush | Red | 3713 | 6271820 | €0,05 |
| 2 | Technic Axle 10 | Red | 3737 | 6130005 | €0,25 |
| 7 | Technic Axle Pin without Friction Ridges Lengthwise | Tan | 3749 | 4666579 | €0,06 |
| 24 | Brick Round 2 x 2 with Axle Hole | Black | 3941 | 614326 | €0,11 |
| 9 | Technic Connector Beam 3 x 3 | Yellow | 39793 | 6252654 | €0,38 |
| 6 | Technic Connector Beam 3 x 3 | Black | 39793 | 6265644 | €0,38 |
| 1 | Technic Beam Frame 7 x 11 | Black | 39794 | 6265643 | €1,59 |
| 6 | Technic Pin Long without Friction Ridges, with Anti-Roll Notch | Tan | 39888 | 6321305 | €0,08 |
| 16 | Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) | Black | 4032a | 403226 | €0,06 |
| 8 | Technic Beam 1 x 9 Thick | Light Bluish Gray | 40490 | 6102449 | €0,29 |
| 7 | Technic Beam 1 x 9 Thick | Black | 40490 | 4645732 | €0,29 |
| 9 | Technic Beam 1 x 9 Thick | Yellow | 40490 | 6115616 | €0,29 |
| 3 | Technic Beam 1 x 13 Thick | Black | 41239 | 4522933 | €0,39 |
| 11 | Technic Beam 1 x 13 Thick | Dark Bluish Gray | 41239 | 4522937 | €0,39 |
| 1 | Tile 1 x 8 with Groove | Black | 4162 | 416226 | €0,15 |
| 50 | Technic Beam 1 x 2 Thin | Black | 41677 | 6338428 | €0,13 |
| 6 | Technic Wedge Belt Wheel [aka Pulley] | Yellow | 4185 | 418524 | — |
| 2 | Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes | Yellow | 42003 | 6273711 | €0,12 |
| 40 | Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes | Black | 42003 | 6273708 | €0,12 |
| 4 | Technic Axle Connector with Axle Hole [Reinforced] | Dark Bluish Gray | 42135 | 6375679 | €0,27 |
| 8 | Technic Axle Connector with Axle Hole [Reinforced] | Black | 42135 | 6331716 | €0,27 |
| 2 | Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls] | Black | 42195 | 6286381 | €0,13 |
| 10 | Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls] | Light Bluish Gray | 42195 | 6273212 | €0,13 |
| 6 | Technic Tread Sprocket Wheel Large Diameter 7 Holes, 14 Tooth | Yellow | 42529 | 6253463 | — |
| 24 | Wheel 11 x 8 with Center Groove | Light Bluish Gray | 42610 | 4211758 | €0,11 |
| 32 | Technic Pin 1/2 | Black | 4274 | 4143005 | €0,05 |
| 390 | Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot | Black | 42924 | 6299413 | €0,10 |
| 150 | Technic Axle Pin with Friction Ridges Lengthwise | Black | 43093 | 4206482 | €0,06 |
| 6 | Technic Linear Actuator with Dark Bluish Gray Ends [Black Version] | Black | 43097 | 6368625 | — |
| 30 | Technic Beam 1 x 2 Thick | Yellow | 43857 | 4187122 | €0,12 |
| 12 | Technic Beam 1 x 2 Thick | Black | 43857 | 4177444 | €0,12 |
| 4 | Technic Beam 1 x 2 Thick | Light Bluish Gray | 43857 | 4211862 | €0,12 |
| 2 | Dish 3 x 3 Inverted [Radar] | Red | 43898 | 6365073 | €0,17 |
| 2 | Dish 3 x 3 Inverted [Radar] | Black | 43898 | 4180087 | €0,17 |
| 14 | Technic Axle 7 | Light Bluish Gray | 44294 | 4211805 | €0,16 |
| 2 | Technic Pin Connector Perpendicular 2 x 2 Bent | Black | 44809 | 6325982 | €0,36 |
| 7 | Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes] | Light Bluish Gray | 44874 | 6321303 | €0,18 |
| 98 | Technic Axle 3 | Light Bluish Gray | 4519 | 4211815 | €0,05 |
| 2 | Technic Steering Wheel Hub with Planetary Gear Reduction | Light Bluish Gray | 46490 | 6275902 | — |
| 1 | Clutch Outer Side with Axle Connector | White | 46834 | 6257336 | €0,69 |
| 1 | Clutch Inner Side with Axle Connector | Dark Bluish Gray | 46835 | 6257337 | €0,59 |
| 2 | Technic Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Along Part) | Light Bluish Gray | 49130 | 6313453 | €0,35 |
| 2 | Wire Clip with Axle Hole | Yellow | 49283 | 6263069 | — |
| 2 | Wire Clip with Axle Hole | Red | 49283 | 6263067 | €0,29 |
| 1 | Wire Clip with Axle Hole | Black | 49283 | 6263071 | — |
| 1 | Wire Clip with Axle Hole | Light Bluish Gray | 49283 | 6263072 | — |
| 2 | Technic Axle 16 | Black | 50451 | 6317564 | €0,90 |
| 24 | Tyre 14 x 6 Solid Smooth | Black | 50951 | 4246901 | €0,18 |
| 2 | Technic Steering / CV Ball Joint Female 4L | Dark Bluish Gray | 52730 | 6261793 | €0,44 |
| 2 | Technic Steering / CV Ball Joint Male 3L | Light Bluish Gray | 52731 | 6262968 | €0,36 |
| 4 | Technic Axle 8 with Stop | Dark Bluish Gray | 55013 | 4499858 | €0,21 |
| 2 | Technic Axle 5.5 with Stop [Rounded Short End] | Dark Bluish Gray | 59426 | 4508553 | €0,11 |
| 61 | Technic Axle Connector Smooth [with x Hole + Orientation] | Black | 59443 | 4512363 | €0,06 |
| 22 | Technic Axle Connector Smooth [with x Hole + Orientation] | Dark Bluish Gray | 59443 | 4516546 | €0,06 |
| 1 | Wheel 31 x 15 Technic, 7 Pin Holes | Yellow | 60208 | 6364403 | €0,48 |
| 38 | Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole | Black | 60483 | 6265091 | €0,07 |
| 7 | Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole | Orange | 60483 | 6265128 | €0,07 |
| 11 | Technic Beam 3 x 3 T-Shape Thick | Yellow | 60484 | 6072627 | €0,18 |
| 2 | Technic Axle 9 | Yellow | 60485 | 6130010 | €0,21 |
| 707 | Technic Pin with Friction Ridges Lengthwise with No Center Slots | Black | 61332 | 6279875 | €0,06 |
| 2 | Plate Round 1 x 1 with Solid Stud | Red | 6141 | 614121 | €0,05 |
| 1 | Plate Special 4 x 4 with Studs on One Edge [Plain] | Yellow | 6179 | 4525895 | — |
| 8 | Technic Universal Joint 3L [Complete Assembly] | Light Bluish Gray | 61903 | 6335279 | €0,74 |
| 9 | Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder] | Dark Bluish Gray | 61904 | 6356106 | €0,77 |
| 2 | Technic Pin Connector Round [Slotted] | Flat Silver | 62462 | 6245499 | €0,06 |
| 38 | Technic Pin Connector Round [Slotted] | Yellow | 62462 | 6173122 | €0,06 |
| 1 | Technic Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Beveled Edge] | Dark Bluish Gray | 62821b | 4525184 | €0,90 |
| 1 | Tile 1 x 3 | Black | 63864 | 4558170 | €0,11 |
| 1 | Tile 1 x 3 | Light Bluish Gray | 63864 | 4558169 | €0,11 |
| 15 | Technic Axle and Pin Connector Perpendicular Triple | Light Bluish Gray | 63869 | 6331441 | €0,17 |
| 3 | Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick | Light Bluish Gray | 64178 | 4540797 | €1,26 |
| 4 | Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick | Yellow | 64179 | 6352947 | — |
| 6 | Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick | Light Bluish Gray | 64179 | 4539880 | €0,91 |
| 8 | Technic Gear Rack 1 x 13 with Axle and Pin Holes | Black | 64781 | 4540906 | — |
| 6 | Technic Panel 5 x 11 x 1 | Yellow | 64782 | 4539112 | — |
| 20 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] | Light Bluish Gray | 65304 | 6321747 | €0,13 |
| 26 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] | Red | 65304 | 6347789 | €0,13 |
| 34 | Technic Axle and Pin Connector Perpendicular | Light Bluish Gray | 6536 | 6261375 | €0,10 |
| 2 | Brick Round 2 x 2 D. Tube with 45° Elbow and Axle Holes (Crossholes) at Each End [SHORT] | Black | 65473 | 6305216 | — |
| 72 | Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Square Holes] | Yellow | 65487 | 6282151 | €0,11 |
| 12 | Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Square Holes] | Black | 65487 | 6282140 | €0,11 |
| 4 | Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes) | Light Bluish Gray | 65489 | 6282158 | €0,22 |
| 4 | Technic Axle 3 with Stud | Dark Tan | 6587 | 6031821 | €0,10 |
| 18 | Technic Gear 12 Tooth Bevel | Tan | 6589 | 4565452 | €0,10 |
| 11 | Technic Beam 1 x 9 Bent (6 - 4) Thick | Yellow | 6629 | 6524459 | €0,34 |
| 27 | Technic Beam 1 x 3 Thin | Yellow | 6632 | 6344174 | €0,25 |
| 4 | Technic Beam 1 x 3 Thin | Black | 6632 | 6331723 | €0,25 |
| 5 | Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole | Red | 66906 | 6360104 | €0,11 |
| 2 | Motor, Large Angular Position, Light Bluish Gray Housing, Black Wire | Dark Bluish Gray | 69730 | 6317490 | — |
| 8 | Technic Axle and Pin Connector Perpendicular Double Split [Reinforced] | Black | 69819 | 6349281 | €0,46 |
| 116 | Technic Link Tread 7L Wide with Two Pin Holes | Yellow | 69910 | 6321711 | — |
| 6 | Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick | Yellow | 71708 | 6332412 | €0,22 |
| 15 | Technic Panel 3 x 7 x 1 | Yellow | 71709 | 6334490 | €0,80 |
| 6 | Technic Panel 3 x 7 x 1 | Black | 71709 | 6331935 | €0,80 |
| 18 | Technic Beam 1 x 15 Thick with Alternating Holes | Black | 71710 | 6321716 | €0,76 |
| 22 | Technic Beam 1 x 11 Thick with Alternating Holes | Black | 73507 | 6330585 | €0,65 |
| 2 | Technic Steering / CV Ball Joint, Cardan Ball with Cross Hole 3L | Light Bluish Gray | 77590 | 6338424 | €1,37 |
| 1 | Sticker Sheet for Set 42131-1 | Unknown | 77607 | 6338502 | — |
| 1 | Hub, Powered Up 4-Port (Technic Control+) - Screw Opening | Light Bluish Gray | 85824 | 6370514 | — |
| 3 | Slope 30? 1 x 2 x 2/3 | Light Bluish Gray | 85984 | 4568637 | €0,07 |
| 3 | Tile 2 x 4 with Groove | Light Bluish Gray | 87079 | 4560183 | €0,16 |
| 2 | Technic Panel Fairing #1 Small Smooth Short, Side A | Yellow | 87080 | 4558879 | — |
| 26 | Technic Axle 4 with Stop | Dark Bluish Gray | 87083 | 6083620 | €0,07 |
| 2 | Technic Panel Fairing #2 Small Smooth Short, Side B | Yellow | 87086 | 4558876 | — |
| 2 | Technic Gear 20 Tooth Bevel with Pin Hole | Light Bluish Gray | 87407 | 4558690 | €0,27 |
| 4 | Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes | Black | 87408 | 6278412 | €0,47 |
| 1 | Plate 2 x 14 | Light Bluish Gray | 91988 | 4662161 | €0,41 |
| 2 | Technic Axle and Pin Connector Perpendicular Split | Light Bluish Gray | 92907 | 6279023 | €0,29 |
| 2 | Technic Axle and Pin Connector Perpendicular Split | Black | 92907 | 6279021 | €0,29 |
| 14 | Technic Gear 16 Tooth Reinforced [New Style] | Light Bluish Gray | 94925 | 4640536 | €0,21 |
| 10 | Tile Round 1 x 1 | Trans-Clear | 98138 | 6274738 | €0,05 |
| 6 | Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle Holes | Red | 98585 | 6313596 | — |
| 4 | Technic Turntable Small Top | Light Bluish Gray | 99009 | 4652235 | €0,44 |
| 4 | Technic Turntable Small Base, 28 Tooth | Black | 99010 | 6326620 | €0,65 |
| 20 | Technic Beam Triangle Thin [Type II] | Yellow | 99773 | 6331435 | €0,31 |

## Notes

- Track which of these parts you own and see what is missing: https://www.brickmissing.com/sets/42131-1-cat-d11-bulldozer
- Inventory data is based on official LEGO inventories via the Rebrickable catalog, updated daily.
- Part images, minifigure lists and related sets are on the set page: https://www.brickmissing.com/sets/42131-1-cat-d11-bulldozer