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.

Assortment of Gears

Checking

9853 Assortment of Gears

122 pieces in 7 part and color combinations.

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 122 pieces

  • Technic Gear 14 Tooth Bevel Light Gray Part 4143 Element 414352 or 414302 ×30
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Gray Part 4019 Element 4107176 or 401902 ×10
  • Technic Gear 24 Tooth Crown with Pointed Teeth Light Gray Part 3650b ×8
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×14
  • Technic Gear 40 Tooth Light Gray Part 3649 Element 364902 ×8
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×50
  • Technic Gear Differential [Old Style, 28 Teeth] Light Gray Part 73071 ×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.