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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.

Cement Mixer

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7990 Cement Mixer

209 pieces in 82 part and color combinations, plus 1 minifigure.

The official piece count includes the 4 parts inside the set's minifigures, which this inventory lists separately. 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

Plates 31 pieces

  • Plate 1 x 1 Blue Part 3024 Element 302423 ×2
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×6
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×3
  • Plate 4 x 12 Dark Bluish Gray Part 3029 Element 4210706 ×1
  • Plate 4 x 4 Dark Bluish Gray Part 3031 Element 4243831 or 4211089 ×4
  • Plate 6 x 6 Dark Bluish Gray Part 3958 Element 4211134 ×1
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×7
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×3
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×1
  • Plate 2 x 8 White Part 3034 Element 6552101 or 303401 ×1
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×2

Plates Special 20 pieces

  • Bracket 1 x 2 - 1 x 4 [Square Corners] Black Part 2436 Element 4282746 or 243626 ×2
  • Bracket 1 x 2 - 2 x 2 Black Part 44728 Element 6117973 or 6048855 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Black Part 4085c Element 408526 ×2
  • Plate Special 1 x 2 with Door Rail Black Part 32028 Element 4107761 ×5
  • Plate Special 2 x 2 with Wheel Holder Black Part 4488 Element 6092658 or 448826 ×8
  • Technic Plate 2 x 4 [3 Holes] Blue Part 3709 Element 370923 ×1

Plates Round Curved and Dishes 16 pieces

  • Plate Round 1 x 1 with Solid Stud Dark Bluish Gray Part 6141 Element 4210633 1 spare in the box ×12
  • Plate Round 1 x 1 with Solid Stud Trans-Orange Part 6141 Element 6514059 or 6240227 1 spare in the box ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×2

Tiles 16 pieces

  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×1
  • Tile 1 x 8 with Groove Blue Part 4162 Element 416223 ×2
  • Tile 1 x 1 with White and Red Gauge Print Light Bluish Gray Part 3070bpr0007 Element 4255629 1 spare in the box ×1
  • Tile 1 x 6 with Groove Light Bluish Gray Part 6636 Element 4211549 ×6
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×2
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×4

Tiles Special 16 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Blue Part 2412b Element 241223 ×5
  • Tile Special 1 x 2 with Handle Blue Part 2432 Element 243223 ×3
  • Tile Special 1 x 1 with Clip and Straight Tips Light Bluish Gray Part 2555 Element 4211369 or 2555194 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Light Bluish Gray Part 2412b Element 4211350 ×6

Wheels and Tyres 16 pieces

  • Tyre 21 x 12 with Offset Tread Small Wide Black Part 6015 Element 601526 ×8
  • Wheel 11 x 12 with Hole Notched for Wheels Holder Pin Light Bluish Gray Part 6014b Element 4211764 ×8

Technic Pins 13 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×9
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×2
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×2

Transportation - Land 11 pieces

  • Wheel Arch, Mudguard 4 x 2 1/2 x 2 with 2 x 2 Plate Black Part 50745 Element 4260488 ×6
  • Tipper Drum 3 x 6 x 10 Cement Mixer Half with 4 Technic Pin Holes Blue Part 57792 Element 4503918 ×2
  • Wheel Arch, Mudguard 4 x 2 1/2 x 2 with 2 x 2 Plate White Part 50745 Element 4259940 ×2
  • Steering Stand 1 x 2 with Black Steering Wheel Yellow Part 3829c01 Element 9553 ×1

Bricks 10 pieces

  • Brick 1 x 1 Blue Part 3005 Element 300523 ×2
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×2
  • Brick 1 x 6 Blue Part 3009 Element 300923 ×1
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×1
  • Brick 1 x 16 Light Bluish Gray Part 2465 Element 4211366 ×2
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×2

Bricks Sloped 10 pieces

  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Blue Part 54200 Element 4504380 or 4296154 1 spare in the box ×2
  • Brick Sloped Inverted 45° 6 x 1 Double with 1 x 4 Recessed Blue Part 52501 Element 4294738 ×1
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Clear Part 54200 Element 6245250 or 4244362 Also in White ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) White Part 54200 Element 6550179 or 4504369 1 spare in the box Also in Trans-Clear ×2
  • Brick Sloped 45° 2 x 2 Yellow Part 3039 Element 303924 ×1

Technic Connectors 9 pieces

  • Technic Axle and Pin Connector Angled #6 - 90° Black Part 32014 Element 6268905 or 4107767 ×1
  • Technic Axle and Pin Connector Angled #1 Dark Bluish Gray Part 32013 Element 32013199 or 6296856 ×2
  • Technic Pin Connector Plate with One Hole (Single on Bottom) Light Bluish Gray Part 32529 Element 4211828 or 4162945 ×2
  • Technic Pin Connector Round [No Slot] Light Bluish Gray Part 75535 Element 4212355 ×4

Bricks Round and Cones 7 pieces

  • Brick Round 4 x 4 with 4 Side Pin Holes and Center Axle Hole Dark Bluish Gray Part 6222 Element 4211097 ×1
  • Brick Round 2 x 2 with Axle Hole Light Bluish Gray Part 3941 Element 4211526 ×3
  • Cone 1 x 1 [No Top Groove] Trans-Orange Part 4589 Element 4221195 ×2
  • Cone 1 x 1 [No Top Groove] Yellow Part 4589 Element 458924 ×1

Technic Bricks 5 pieces

  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Light Bluish Gray Part 32064b ×2
  • Technic Brick 1 x 1 with Pin Hole Red Part 6541 Element 654121 ×1
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×2

Bricks Special 4 pieces

  • Brick Special 1 x 2 with Studs on 2 Sides Black Part 52107 Element 4253815 ×1
  • Brick Special 1 x 1 Studs on 4 Sides White Part 4733 Element 4111971 or 473301 ×3

Minifig Accessories 4 pieces

  • Tap 1 x 1 with Hole in Spout Black Part 4599a ×2
  • Equipment Shovel [Rounded Handle End] Dark Bluish Gray Part 3837 Element 4211006 ×1
  • Equipment Hose Nozzle / Gun with Side String Hole Simplified Yellow Part 60849 Element 6526122 or 6114982 1 spare in the box ×1

Panels 3 pieces

  • Panel 1 x 2 x 1 [Square Corners] White Part 4865a Element 486501 ×2
  • Panel 1 x 4 x 1 with Rounded Corners [Thick Wall] White Part 43337 Element 4173477 ×1

Technic Axles 3 pieces

  • Technic Axle 4 Black Part 3705 Element 370526 ×1
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×1

Tiles Round and Curved 3 pieces

  • Tile Round 2 x 2 with Bottom Cross Light Bluish Gray Part 4150 Element 4211480 ×3

Bars, Ladders and Fences 2 pieces

  • Lever Small Base with Black Lever Yellow Part 298c02 Element 74156 2 spares in the box ×2

Bricks Curved 2 pieces

  • Brick Curved 1 x 2 x 1 1/3 with Curved Top Black Part 6091 Element 6383142 or 6184784 ×2

Technic Gears 2 pieces

  • Technic Gear 12 Tooth Bevel Light Bluish Gray Part 6589 Element 6589194 or 4565450 ×2

Bricks Wedged 1 piece

  • Brick Wedged, Curved Triple 4 x 6 x 2/3 with 4 Studs White Part 52031 Element 4261565 ×1

Plates Wedged 1 piece

  • Wedge Plate 2 x 4 White Part 51739 Element 6552128 or 4249506 ×1

Stickers 1 piece

  • Sticker Sheet for Set 7990-1 [No Color/Any Color] Part 59826 Element 4506612 ×1

Technic Special 1 piece

  • Gearbox 4 x 4 x 1 2/3 with 1 x 2 Cutouts, Pin Holes Black Part 6585 Element 6169982 or 4500902 ×1

Tubes and Hoses 1 piece

  • Flexible Ribbed Hose 8mm Ends 19L Black Part 57539 Element 4561467 or 4504612 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 2 x 6 x 2, Wide Top Trans-Brown Part 4176 Element 4176111 or 4173328 ×1

Minifigures 1 figure

  • Construction Worker, White and Blue Overalls, Red Hard Hat, Cheek Lines Minifigure, checked as a whole figure ×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.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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