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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.

Technic and Pneumatic Elements

Checking

9604 Technic and Pneumatic Elements

128 pieces in 35 part and color combinations.

LEGO counts 124 pieces. This inventory comes from a separate parts catalog and lists 128; 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 Bricks 28 pieces

  • 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 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×8
  • 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 ×4

Plates 23 pieces

  • Plate 1 x 2 Black Part 3023 Element 302326 ×12
  • Plate 1 x 4 Red Part 3710 Element 371021 ×2
  • Plate 1 x 8 Red Part 3460 Element 346021 ×4
  • Plate 2 x 6 Red Part 3795 Element 379521 ×2
  • Plate 4 x 6 Red Part 3032 Element 303221 ×3

Technic Pins 20 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×12
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×8

Technic Bushes 12 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×8
  • Technic Bush 1/2 Toothed Type I [+ Opening] Light Gray Part 4265a Element 426502 ×4

Tiles 10 pieces

  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×2
  • Tile 1 x 4 with Groove Red Part 2431 Element 243121 ×4
  • Tile 1 x 8 with Groove Red Part 4162 Element 416221 ×4

Pneumatics 9 pieces

  • Pneumatic Switch with Top Studs Light Gray Part 75215 Element 4190775 or 75215 ×2
  • Pneumatic T-Piece (T Bar) [Old Style] Light Gray Part 4697a ×4
  • Pneumatic Cylinder with 2 Inlets Medium (48mm) with Black Top Yellow Part 2793c01 Element 4190836 or 74721 ×2
  • Pneumatic Pump New Style with Black Top Yellow Part 2797c02 Element 4563134 or 74720 ×1

Technic Axles 8 pieces

  • Technic Axle 4 Black Part 3705 Element 370526 ×1
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×3

Plates Special 7 pieces

  • Technic Plate 2 x 4 [3 Holes] Red Part 3709 Element 370921 ×4
  • Technic Plate 2 x 8 [7 Holes] Red Part 3738 Element 373821 ×3

Gear Parts 5 pieces

  • Activity Booklet 1 - Inventory and Set-up Card - Set 9604 [No Color/Any Color] Part 9604b1 ×1
  • Activity Booklet 2 - Vertical and Horizontal Pneumatic Press - Set 9604 [No Color/Any Color] Part 9604b2 ×1
  • Activity Booklet 3 - Pneumatic Lift and Dump Box - Set 9604 [No Color/Any Color] Part 9604b3 ×1
  • Activity Booklet 4 - Pneumatically Operated Doors - Set 9604 [No Color/Any Color] Part 9604b4 ×1
  • Activity Booklet 5 - Pneumatic Chair and Arm - Set 9604 [No Color/Any Color] Part 9604b5 ×1

Technic Connectors 4 pieces

  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×4

Tubes and Hoses 2 pieces

  • Hose, Pneumatic 4mm D. 250L Black Part 5102c250 ×1
  • Hose, Pneumatic 4mm D. 50L / 400mm Light Gray Part 5102c50 ×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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