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The Workshop Sheet 10 of 21

LEGO Missing Piece Checker

Enter a set number, mark each piece found or missing, and leave with a list of what is missing, the element IDs LEGO asks for and links to buy the parts. It is free and needs no account. Rule out the usual hiding places first.

Technology Resource Set

Checking

9609 Technology Resource Set

1,730 pieces in 111 part and color combinations.

LEGO counts 1,733 pieces. This inventory comes from a separate parts catalog and lists 1,730; 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 731 pieces

  • 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. Light Gray Part 5102 ×2
  • Motor Pulley, 9V Micromotor with Axle Hole Light Gray Part 2983 Element 298630 ×10
  • Motor, 9V 5 x 4 x 2 1/3, Dark Gray Bottom Light Gray Part 2838c01 Element 4494210 or 74569 ×1
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×30
  • Plate 1 x 3 Light Gray Part 3623 Element 362302 ×8
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×12
  • Plate 1 x 6 Light Gray Part 3666 Element 366602 ×8
  • Plate 1 x 8 Light Gray Part 3460 Element 346002 ×8
  • Plate 2 x 2 Light Gray Part 3022 Element 302202 ×8
  • Plate 2 x 6 Light Gray Part 3795 Element 379502 ×8
  • Plate 6 x 10 Light Gray Part 3033 Element 303302 ×6
  • 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 ×24
  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Gray Part 6553 Element 655302 ×8
  • Technic Axle Connector Ridged [with + Hole + Orientation] Light Gray Part 6538a ×10
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×16
  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×40
  • Technic Axle and Pin Connector Perpendicular Light Gray Part 6536 Element 4173667 or 653602 ×8
  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×8
  • Technic Brick 1 x 1 with Pin Hole Light Gray Part 6541 Element 654102 ×8
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×200
  • Technic Bush 1/2 Toothed Type II [X Opening] Light Gray Part 4265b Element 4100501 or 657702 ×40
  • Technic Cam Light Gray Part 6575 Element 657502 ×8
  • Technic Engine Piston Square 2 x 2 - Old Light Gray Part 3652 Element 365202 ×2
  • Technic Gear 14 Tooth Bevel Light Gray Part 4143 Element 414352 or 414302 ×16
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Gray Part 4019 Element 4107176 or 401902 ×10
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Gray Part 3650c Element 365002 ×10
  • Technic Gear 24 Tooth [Old Style - Three Axle Holes] Light Gray Part 3648a ×16
  • Technic Gear 40 Tooth Light Gray Part 3649 Element 364902 ×8
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×30
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×20
  • Technic Pin 1/2 without Friction Ridges Light Gray Part 4274 Element 427402 ×10
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×75
  • Technic Plate 2 x 4 [3 Holes] Light Gray Part 3709 Element 370902 ×8
  • Technic Plate 2 x 8 [7 Holes] Light Gray Part 3738 Element 373802 ×4
  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Light Gray Part 85544 Element 70903 ×4
  • Technic Shock Absorber 6.5L with Normal Spring [Complete Assembly] Light Gray Part 73129 Element 73129 ×4
  • Technic Steering Pulley Large Light Gray Part 3736 Element 373602 ×2
  • Technic Universal Joint 4L [Complete Assembly] Light Gray Part 9244 Element 9244 ×4
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×16
  • Tile 1 x 4 with Groove Light Gray Part 2431 Element 243102 ×4
  • Tile 1 x 8 with Groove Light Gray Part 4162 Element 416202 ×4
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×10

Black 656 pieces

  • Hook, Technic - Large Black Part 70496 Element 70644 ×1
  • Hose, Pneumatic 4mm D. Black Part 5102 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×12
  • Rubber Band Large [Square Cross Section] Black Part 70158 ×20
  • Rubber Band Medium (Square Cross Section) Black Part 71156 Element 71156 ×20
  • Rubber Band Medium (Square Cross Section) Thin Cut Black Part 70012 Element 70012 ×20
  • Rubber Band Small 13mm (Square Cross Section) Black Part 71509 Element 4141606 or 4107153 ×10
  • String Cord Medium Thickness 50cm Black Part 7916c50 ×1
  • Technic Axle 10 Black Part 3737 Element 373726 ×8
  • Technic Axle 12 Black Part 3708 Element 370826 ×8
  • Technic Axle 2 Black Part 3704 Element 370426 ×6
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×6
  • Technic Axle 4 Black Part 3705 Element 370526 ×16
  • Technic Axle 6 Black Part 3706 Element 370626 ×24
  • Technic Axle 8 Black Part 3707 Element 370726 ×16
  • Technic Link Black Part 3711a Element 371126 ×350
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×100
  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×8
  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×10
  • Tyre 24 x 13 Model Team Black Part 2696 Element 269676 or 269626 ×4
  • Tyre 81.6 x 15 Motorcycle Black Part 2902 Element 6226880 or 4562873 ×4
  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×8
  • Wire with Brick 2 x 2 x 2/3 Pair, 162L Black Part 5306bc162 Element 75656 ×2

Red 206 pieces

  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×8
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×8
  • Brick 2 x 4 Red Part 3001 Element 300121 ×8
  • Brick Round 2 x 2 with Axle Hole Red Part 3941 Element 614321 or 394121 ×4
  • Brick Sloped 45° 2 x 2 Double Red Part 3043 Element 304321 ×6
  • Brick Special 2 x 6 x 2 Weight with Sealed Bottom and Dimples on Ends Red Part 73090b Element 74160 ×2
  • Plate 1 x 3 Red Part 3623 Element 362321 ×12
  • Plate 1 x 4 Red Part 3710 Element 371021 ×8
  • Plate 1 x 6 Red Part 3666 Element 366621 ×4
  • Plate 1 x 8 Red Part 3460 Element 346021 ×8
  • Plate 2 x 6 Red Part 3795 Element 379521 ×8
  • Plate 4 x 6 Red Part 3032 Element 303221 ×6
  • Technic Brick 1 x 10 [9 Pin Holes] Red Part 2730 Element 273021 ×8
  • Technic Brick 1 x 12 [11 Pin Holes] Red Part 3895 Element 389521 ×8
  • Technic Brick 1 x 16 [15 Pin Holes] Red Part 3703 Element 370321 ×8
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×24
  • Technic Brick 1 x 4 [3 Pin Holes] Red Part 3701 Element 370121 ×24
  • Technic Brick 1 x 6 [5 Pin Holes] Red Part 3894 Element 389421 ×8
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×8
  • Technic Plate 2 x 4 [3 Holes] Red Part 3709 Element 370921 ×8
  • Technic Plate 2 x 8 [7 Holes] Red Part 3738 Element 373821 ×8
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×4
  • Tile 1 x 4 with Groove Red Part 2431 Element 243121 ×8
  • Tile 1 x 8 with Groove Red Part 4162 Element 416221 ×8

Blue 114 pieces

  • Bracket 2 x 2 - 2 x 2 Blue Part 3956 Element 6019215 or 395623 ×8
  • Hinge Brick 1 x 2 Base Blue Part 3937 Element 393723 ×6
  • Hinge Brick 1 x 2 Top Plate Thin Blue Part 3938 Element 4279389 or 393823 ×6
  • Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×8
  • Technic Brick 1 x 16 [15 Pin Holes] Blue Part 3703 Element 370323 ×8
  • Technic Brick 1 x 2 [1 Pin Hole] Blue Part 3700 Element 370023 ×24
  • Technic Brick 1 x 4 [3 Pin Holes] Blue Part 3701 Element 370123 ×24
  • Technic Brick 1 x 6 [5 Pin Holes] Blue Part 3894 Element 389423 ×8
  • Technic Brick 1 x 8 [7 Pin Holes] Blue Part 3702 Element 370223 ×8
  • Technic Rubber Belt Medium [26mm ID] [Round Cross Section] Blue Part 85545 Element 6049730 or 4544147 ×4
  • Turntable 2 x 2 Plate, Base Blue Part 3680 Element 368023 ×10

White 9 pieces

  • String, Elastic Thin [Undetermined Length] White Part 71831 Element 4114399 ×1
  • Wheel 30 x 13 Model Team White Part 2695 Element 4507077 or 4240315 ×4
  • Wheel 61.6 x 13.6 Motorcycle White Part 2903 Element 290301 ×4

Yellow 8 pieces

  • 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 ×2
  • Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×4

Dark Gray 4 pieces

  • Brick Separator v1.0 Dark Gray Part 6007 Element 600727 ×2
  • Technic Gear Differential, 24 -16 Tooth with Clutch on Both Sides Dark Gray Part 6573 Element 657327 ×2

Green 2 pieces

  • Brick 8 x 16 Green Part 4204 Element 4181116 or 420428 ×2

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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