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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.

Pneumatics I: Introduction to Air Power Set

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9617 Pneumatics I: Introduction to Air Power Set

98 pieces in 38 part and color combinations.

LEGO counts 89 pieces. This inventory comes from a separate parts catalog and lists 98; 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

Technic Pins 22 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×12
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×4
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×6

Technic Bricks 20 pieces

  • Technic Brick 1 x 12 [11 Pin Holes] Red Part 3895 Element 389521 ×2
  • Technic Brick 1 x 16 [15 Pin Holes] Red Part 3703 Element 370321 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×6
  • 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

Plates 15 pieces

  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×7
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×2
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×2
  • Plate 4 x 6 Yellow Part 3032 Element 303224 ×4

Gear Parts 8 pieces

  • Storage / Sorting Tray, Dacta, 7 Compartment for Dacta Extra Small Bin Trans-Clear Part 167914 ×1
  • Storage Bin Lid, Dacta, Extra Small Trans-Clear Part 71084 ×1
  • Storage Bin, Dacta, Extra Small Yellow Part upn0042 ×1
  • Activity Booklet - Parts Tray Organizer Card - Set 9617 [No Color/Any Color] Part 9617bc ×1
  • Activity Booklet - Pneumatic Manual and Basic Levers - Set 9617 [No Color/Any Color] Part 9617bm ×1
  • Activity Booklet 1 - Pneumatic Press - Set 9617 [No Color/Any Color] Part 9617b01 ×1
  • Activity Booklet 2 - Pneumatic Lift - Set 9617 [No Color/Any Color] Part 9617b02 ×1
  • Instruction Card - Set 9617 [No Color/Any Color] Part 9617bd ×1

Technic Bushes 8 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 1 spare in the box ×4
  • Technic Bush 1/2 Toothed Type II [X Opening] Light Gray Part 4265b Element 4100501 or 657702 1 spare in the box ×4

Technic Axles 5 pieces

  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×2

Technic Beams 4 pieces

  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×4

Wheels and Tyres 4 pieces

  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×2
  • Wheel with Split Axle hole Yellow Part 3482 Element 348224 ×2

Plates Special 3 pieces

  • Technic Plate 2 x 4 [3 Holes] Yellow Part 3709 Element 370924 ×1
  • Technic Plate 2 x 8 [7 Holes] Yellow Part 3738 Element 4624216 or 373824 ×2

Pneumatics 3 pieces

  • Pneumatic Switch with Top Studs Light Gray Part 75215 Element 4190775 or 75215 ×1
  • Pneumatic Cylinder with 2 Inlets Medium (48mm) with Black Top Yellow Part 2793c01 Element 4190836 or 74721 ×1
  • Pneumatic Pump New Style with Black Top Yellow Part 2797c02 Element 4563134 or 74720 ×1

Tubes and Hoses 3 pieces

  • Hose, Pneumatic 4mm D. 26.25L / 21cm Black Part 5102c26.25 ×1
  • Hose, Pneumatic 4mm D. 26.25L / 21cm Blue Part 5102c26.25 ×1
  • Hose, Pneumatic 4mm D. 20L / 16cm Light Gray Part 5102c20 ×1

Tiles 2 pieces

  • Tile 1 x 6 with Groove Yellow Part 6636 Element 6388488 or 663624 ×2

Stickers 1 piece

  • Sticker Sheet for Dacta Storage Bin Labels [No Color/Any Color] Part stickerupn0041 ×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.