The Workshop Sheet 10 of 22

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.

Expert Builder Power Pack

Checking

8700 Expert Builder Power Pack

27 pieces in 18 part and color combinations.

LEGO counts 26 pieces. This inventory comes from a separate parts catalog and lists 27; 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 12 pieces

  • Battery Box, 4.5V, 4 x 24, 3 x C-Cell with Switch [Complete Assembly] Light Gray Part 4350c02 ×1
  • Motor, 4.5V Type 2 for 2-Prong Connectors with Middle Pin Light Gray Part 6216b ×1
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×2
  • Technic Gear 24 Tooth Crown with Flat Teeth Light Gray Part 3650a ×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 ×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
  • Wire with 2-Prong Connectors, 12V / 4.5V 28L Light Gray Part 766c28 Element 74531 ×1
  • Wire with 2-Prong Connectors, 12V / 4.5V 96L Light Gray Part 766c96 Element 73493 ×1

Yellow 10 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Yellow Part 3701 Element 370124 ×2
  • Technic Plate 2 x 4 [3 Holes] Yellow Part 3709 Element 370924 ×2
  • Technic Plate 2 x 8 [7 Holes] Yellow Part 3738 Element 4624216 or 373824 ×2

Black 4 pieces

  • Rubber Band Medium (Square Cross Section) Thin Cut Black Part 70012 Element 70012 ×1
  • Rubber Band Small 13mm (Square Cross Section) Black Part 71509 Element 4141606 or 4107153 ×1
  • Technic Axle 4 Black Part 3705 Element 370526 ×2

[No Color/Any Color] 1 piece

  • User Guide, Information Note, Use of Battery Box - 113578-UK/F/NL [No Color/Any Color] Part 113578 ×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.