Free tool

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.

Power Pack

Checking

8720 Power Pack

56 pieces in 32 part and color combinations.

LEGO counts 57 pieces. This inventory comes from a separate parts catalog and lists 56; 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.

Show

Piece checklist

Light Gray 41 pieces

  • Battery Box, 9V 4 x 14 x 4 with Dark Gray Base [Complete Assembly] Light Gray Part 2847c01 Element 4109813 or 74650 ×1
  • 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 ×4
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×4
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×1
  • Technic Brick 1 x 2 [1 Pin Hole] Light Gray Part 3700 Element 370002 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Light Gray Part 3701 Element 370102 ×2
  • Technic Brick 1 x 6 [5 Pin Holes] Light Gray Part 3894 Element 389402 ×2
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 1 spare in the box ×2
  • Technic Bush 1/2 Toothed Type II [X Opening] Light Gray Part 4265b Element 4100501 or 657702 2 spares in the box ×3
  • Technic Gear 14 Tooth Bevel Light Gray Part 4143 Element 414352 or 414302 ×2
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Gray Part 4019 Element 4107176 or 401902 ×1
  • Technic Gear 24 Tooth Crown with Pointed Teeth Light Gray Part 3650b ×1
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 1 spare in the box ×2
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×4
  • Technic Plate 2 x 4 [3 Holes] Light Gray Part 3709 Element 370902 ×2
  • Technic Plate 2 x 8 [7 Holes] Light Gray Part 3738 Element 373802 ×1
  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Light Gray Part 85544 Element 70903 ×1
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×2

Black 9 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×1
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×1
  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×1
  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×1
  • Wire with Brick 2 x 2 x 2/3 Pair, 162L Black Part 5306bc162 Element 75656 ×1

White 4 pieces

  • Plate 2 x 4 with Electric Contacts White Part 4757 Element 475701 or 73534 ×1
  • Plate 2 x 8 with Electric Contacts White Part 4758 Element 475801 or 73535 ×1
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×2

Blue 1 piece

  • Technic Rubber Belt Medium [26mm ID] [Round Cross Section] Blue Part 85545 Element 6049730 or 4544147 ×1

Yellow 1 piece

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