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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.

Advanced Air Power Set

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9633 Advanced Air Power Set

217 pieces in 60 part and color combinations.

LEGO counts 238 pieces. This inventory comes from a separate parts catalog and lists 217; 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.

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Piece checklist

Light Gray 77 pieces

  • Baseplate 16 x 32 Light Gray Part 3857 Element 4219612 or 274802 ×1
  • Battery Box, 9V 4 x 14 x 4 with Dark Gray Base [Complete Assembly] Light Gray Part 2847c01 Element 4109813 or 74650 ×1
  • Hose, Pneumatic 4mm D. 66L Light Gray Part 5102c66 ×1
  • Motor, 9V 5 x 4 x 2 1/3, Dark Gray Bottom Light Gray Part 2838c01 Element 4494210 or 74569 ×1
  • Pneumatic Switch with Top Studs Light Gray Part 75215 Element 4190775 or 75215 ×3
  • Pneumatic T-Piece (T Bar) [New Style] Light Gray Part 4697b Element 469702 1 spare in the box ×4
  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Gray Part 6553 Element 655302 ×2
  • Technic Axle Connector with Axle Hole Light Gray Part 32039 Element 4106469 ×3
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×10
  • Technic Beam 1 x 3 Thin Light Gray Part 6632 Element 4107825 ×4
  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×2
  • Technic Beam 1 x 5 Thin Light Gray Part 32017 Element 4106885 ×4
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 1 spare in the box ×12
  • Technic Bush 1/2 Toothed Type II [X Opening] Light Gray Part 4265b Element 4100501 or 657702 1 spare in the box ×10
  • Technic Engine Crankshaft Light Gray Part 2853 Element 4119475 or 285302 ×4
  • Technic Gear 12 Tooth Bevel Light Gray Part 6589 Element 658902 ×2
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Light Gray Part 3648b Element 4107543 or 364802 ×1
  • Technic Gear 40 Tooth Light Gray Part 3649 Element 364902 ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×3
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×4
  • Technic Plate 1 x 8 with Toothed Ends Light Gray Part 4442 Element 444252 or 444202 ×2
  • Technic Steering Pulley Large Light Gray Part 3736 Element 373602 ×1
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×1

Black 64 pieces

  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×2
  • Hose, Pneumatic 4mm D. 68L Black Part 5102c68 ×1
  • Plate 1 x 2 Black Part 3023 Element 302326 ×7
  • Plate 1 x 4 Black Part 3710 Element 371026 ×7
  • Plate 2 x 2 Black Part 3022 Element 302226 ×5
  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×3
  • Technic Axle 6 Black Part 3706 Element 370626 ×6
  • Technic Axle 8 Black Part 3707 Element 370726 ×3
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×16
  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×4
  • Technic Plate 2 x 8 [7 Holes] Black Part 3738 Element 373826 ×3
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×4
  • Wire with Brick 2 x 2 x 2/3 Pair, 69L Black Part 5306bc069 Element 75782 ×1

Red 49 pieces

  • Brick 2 x 4 Red Part 3001 Element 300121 ×4
  • Storage Bin, Dacta, Small Red Part upn0032 ×1
  • Technic Brick 1 x 12 [11 Pin Holes] Red Part 3895 Element 389521 ×4
  • Technic Brick 1 x 16 [15 Pin Holes] Red Part 3703 Element 370321 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×20
  • Technic Brick 1 x 4 [3 Pin Holes] Red Part 3701 Element 370121 ×4
  • Technic Brick 1 x 6 [5 Pin Holes] Red Part 3894 Element 389421 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×10

Dark Gray 11 pieces

  • Hose Rigid 3mm D. 4L / 3.2cm Dark Gray Part 75c04 Element 4118605 1 spare in the box ×4
  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×3
  • Technic Pin 3/4 Dark Gray Part 32002 Element 4109854 1 spare in the box ×4

Yellow 7 pieces

  • Pneumatic Cylinder 1 x 5 with 2 Inlets Yellow Part 74981 Element 6005292 or 4625540 ×1
  • Pneumatic Cylinder with 2 Inlets Medium (48mm) with Black Top Yellow Part 2793c01 Element 4190836 or 74721 ×2
  • Pneumatic Pump 1 x 5.5 Yellow Part 74982 Element 4563137 or 74982 ×2
  • Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×2

Blue 4 pieces

  • Hose, Pneumatic 4mm D. 48L / 384mm Blue Part 5102c48 ×1
  • Pneumatic Airtank Blue Part 75974 Element 4107073 ×1
  • Technic Rubber Belt Medium [26mm ID] [Round Cross Section] Blue Part 85545 Element 6049730 or 4544147 ×2

[No Color/Any Color] 3 pieces

  • Activity Booklet - Parts Tray Organizer Card - Set 9633 [No Color/Any Color] Part 9633bc ×1
  • Activity Booklet - [Sets 9701 & 9751 Extra-Curricular Activities] [No Color/Any Color] Part 9633b2 ×1
  • Activity Booklet - [Sliding Door, Small Crane, Power Spreader] - Set 9633 [No Color/Any Color] Part 9633b1 ×1

Trans-Clear 2 pieces

  • Storage / Sorting Tray, Dacta, 35 Compartment for Dacta Small Bin Trans-Clear Part 167917 ×1
  • Storage Bin Lid, Dacta, 19 x 24 Trans-Clear Part 71082 ×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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