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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.

Mobile Defense Tank

Checking

7706 Mobile Defense Tank

357 pieces in 87 part and color combinations, plus 2 minifigures.

The official piece count includes the 8 parts inside the set's minifigures, which this inventory lists separately. 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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

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Piece checklist

Black 107 pieces

  • Bar 6.6L with Stop Ring [Umbrella Stand] Black Part 4095 Element 409526 ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×4
  • Support 1 x 1 x 5 1/3 Spiral Staircase Axle Black Part 40244 Element 4155558 ×10
  • Technic Axle 4 Black Part 3705 Element 370526 ×5
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Axle Connector Ridged [with x Hole x Orientation] Black Part 6538b Element 4113805 or 4107083 ×1
  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×2
  • Technic Axle and Pin Connector Angled #6 - 90° Black Part 32014 Element 6268905 or 4107767 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Black Part 32184 Element 6276951 or 4121667 ×4
  • Technic Beam 1 x 3 Thick Black Part 32523 Element 4142822 or 3252326 Also in Dark Bluish Gray ×1
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×4
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×18
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×35
  • Technic Tread Large [36 Links] Black Part 53992 Element 6089573 or 6070518 ×4
  • Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Black Part 56145 Element 4299389 or 4284946 ×12

Dark Bluish Gray 68 pieces

  • Plate 1 x 8 Dark Bluish Gray Part 3460 Element 4210998 ×2
  • Plate 2 x 6 Dark Bluish Gray Part 3795 Element 4211002 ×1
  • Plate 4 x 6 Dark Bluish Gray Part 3032 Element 4211115 or 3032199 ×1
  • Plate Special 8 x 8 with Grille [Hole in Center] Dark Bluish Gray Part 4151b Element 6471953 or 4299022 ×2
  • Technic Axle 3 with Stud Dark Bluish Gray Part 6587 Element 6587199 or 6129590 ×12
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×8
  • Technic Axle and Pin Connector Perpendicular Double Dark Bluish Gray Part 32291 Element 6280395 or 4210655 ×12
  • Technic Beam 1 x 2 with Ball Joint Angled Dark Bluish Gray Part 50923 Element 4503381 or 4289258 ×3
  • Technic Beam 1 x 3 Thick Dark Bluish Gray Part 32523 Element 32523199 or 4210751 Also in Black ×1
  • Technic Beam 1 x 3 Thin Dark Bluish Gray Part 6632 Element 6632199 or 6364452 ×2
  • Technic Beam 1 x 9 Bent (7 - 3) Thick Dark Bluish Gray Part 32271 Element 6276837 or 4281516 ×4
  • Technic Beam 2 x 4 L-Shape Thick Dark Bluish Gray Part 32140 Element 6271830 or 4210667 ×8
  • Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] Dark Bluish Gray Part 32530 Element 4210763 ×2
  • Technic Plate 2 x 4 [3 Holes] Dark Bluish Gray Part 3709 Element 4227398 ×4
  • Technic Rotation Joint Disk with Pin Hole and 3L Beam Thick Dark Bluish Gray Part 44224 Element 4182751 ×4
  • Tile 1 x 4 with Groove Dark Bluish Gray Part 2431 Element 4211053 ×2

Light Bluish Gray 67 pieces

  • Bracket 1 x 2 - 2 x 2 Light Bluish Gray Part 44728 Element 6117967 or 6009014 ×1
  • Bracket 2 x 2 - 2 x 2 Light Bluish Gray Part 3956 Element 6254807 or 6019212 ×2
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Light Bluish Gray Part 3747b Element 4211570 ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Light Bluish Gray Part 3660 Element 4211436 ×2
  • Brick Special 2 x 2 with Pin and Axle Hole Light Bluish Gray Part 6232 Element 6347704 or 4211529 ×1
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×9
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×4
  • Technic Axle Connector 2 x 3 with Ball Socket, Open Sides Light Bluish Gray Part 32174 Element 4240563 ×3
  • Technic Beam 1 x 15 Thick Light Bluish Gray Part 32278 Element 4542577 or 4211770 ×2
  • Technic Beam 1 x 9 Thick Light Bluish Gray Part 40490 Element 6102449 or 4211866 ×4
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Ridges Light Bluish Gray Part 32064c ×8
  • Technic Brick 6 x 8 with 4 x 6 Opening Light Bluish Gray Part 32532 Element 6421513 or 4211848 ×1
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×4
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×12
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×4
  • Technic Plate 2 x 6 [5 Holes] Light Bluish Gray Part 32001 Element 4211542 ×2
  • Technic Rotation Joint Disk with Pin and 3L Beam Thick Light Bluish Gray Part 44225 Element 6671155 or 6332151 ×4

White 32 pieces

  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×1
  • Brick Curved 2 x 2 x 2/3 Two Studs and Lip End White Part 41855 Element 4188822 ×2
  • Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder White Part 30367b ×2
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×2
  • Cylinder 3 x 6 x 2 2/3 Horizontal Hollow Studs White Part 30360 Element 4215142 or 4142999 ×1
  • Hinge Plate 1 x 2 Locking with 1 Finger On Top White Part 30383 Element 6265695 or 4262011 ×2
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×1
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×1
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] White Part 3839b Element 6619286 or 383901 ×1
  • Plate Special 2 x 2 with Pin on Bottom White Part 2476a Element 6313603 or 4293876 ×1
  • Technic Brick 1 x 2 [2 Pin Holes] White Part 32000 Element 6564911 or 3200001 ×7
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×1
  • Tile 1 x 6 with Groove White Part 6636 Element 6548296 or 663601 ×1
  • Tile Round 2 x 2 with Bottom Cross White Part 4150 Element 415051 or 415001 ×4
  • Tile Special 1 x 2 Grille with Bottom Groove White Part 2412b Element 6601902 or 241201 ×3

Orange 31 pieces

  • Brick 1 x 10 Orange Part 6111 Element 4542432 or 4294622 ×1
  • Brick Curved 8 x 8 x 2 Double Orange Part 54095 Element 4292851 ×2
  • Brick Round 2 x 2 with Axle Hole Orange Part 3941 Element 4141089 ×1
  • Brick Sloped 33° 3 x 2 Orange Part 3298 Element 4121742 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Orange Part 3040b Element 4121967 or 4118901 ×4
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Orange Part 3747b Element 4500468 ×2
  • Brick Wedged, Curved 6 x 4 Triple Orange Part 43712 Element 6640163 or 6454352 ×8
  • Brick Wedged, Curved 8 x 3 x 2 Open Left Orange Part 41750 Element 6489306 or 4251106 ×2
  • Brick Wedged, Curved 8 x 3 x 2 Open Right Orange Part 41749 Element 6489305 or 4251103 ×2
  • Plate 2 x 3 Orange Part 3021 Element 4125278 ×2
  • Plate Special 1 x 2 Side Handle [Free Ends] Orange Part 2540 Element 4190164 or 4163269 ×1
  • Technic Brick 1 x 6 [5 Pin Holes] Orange Part 3894 Element 4294620 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Orange Part 4185 Element 6533559 or 4540424 ×2

Blue 29 pieces

  • Cone 1 x 1 [No Top Groove] Blue Part 4589 Element 4520957 or 458923 ×10
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×19

Lime 10 pieces

  • Projectile, Weapon Disc 2 x 2 with Marbled Yellow Pattern Lime Part 53993pat0001 Element 4494395 ×10

Red 6 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×6

Trans-Brown 2 pieces

  • Launcher 2 x 3 x 4 2/3, Disc Trans-Brown Part 53990 Element 4292137 ×1
  • Windscreen 8 x 4 x 2 Curved Taper with Locking Dual 2 Fingers Trans-Brown Part 30536 Element 4215614 or 4143049 ×1

Trans-Neon Orange 2 pieces

  • Wave / Flame Rounded with Base Pegs Trans-Neon Orange Part 6126a ×2

Trans-Clear 1 piece

  • Light Brick 2 x 4 [Red LED] Trans-Clear Part 54605 Element 4283931 ×1

Trans-Red 1 piece

  • Bar 4L (Lightsaber Blade / Wand) Trans-Red Part 30374 Element 6507880 or 6167284 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 7706-1 [No Color/Any Color] Part 55762 Element 4292303 ×1

Minifigures 2 figures

  • Ryo Minifigure, checked as a whole figure ×1
  • Gate Guard / Ryo Minifigure, checked as a whole figure ×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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