How many pieces does the LEGO Heavy-Duty Excavator (42121-1) have?

The LEGO Heavy-Duty Excavator set (42121-1) contains 569 pieces. It was released in 2021 as part of the LEGO Technic theme.

How can I find missing parts for LEGO set 42121-1?

On BrickMissing you can check which parts from the LEGO Heavy-Duty Excavator (42121-1) you already own. Add your LEGO collection and we'll show exactly which of the 569 pieces you're missing and which you already have.

Can I build the LEGO Heavy-Duty Excavator with parts I already have?

Use BrickMissing's free parts checker to find out. Add LEGO sets you own to your collection and we'll cross-reference all 569 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO Heavy-Duty Excavator from?

The LEGO Heavy-Duty Excavator (42121-1) belongs to the LEGO Technic theme. You can browse all Technic sets on BrickMissing to find more sets from this theme.

Heavy-Duty Excavator

42121-1 Technic 2021 569 parts 0.9% repair risk Intermediate

The LEGO Technic Heavy-Duty Excavator (42121-1) offers an intricate look at construction machinery. This 569-piece model features a shovel that moves up and down, a movable arm, and running belts for movement. The excavator body rotates 360 degrees, and its cabin includes a driver's seat and control panel. The set comes with LEGO brick ‘stones’ for digging and four cones. As a 2-in-1 build, the model reconstructs into a tracked tractor equipped with a backhoe, demonstrating Technic's mechanical design principles.

42121-1

3D build progress

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Parts Inventory

🧱 569 parts

Part	Color	Qty	LEGO price each
Technic Gear 8 Tooth [Reinforced] 10928	Dark Bluish Gray	6×	€0,15 View at LEGO → View
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle 11214	Red	7×	€0,29 View at LEGO → View
Slope Curved 2 x 1 No Studs [1/2 Bow] 11477	Red	1×	€0,06 View at LEGO → View
Technic Beam 1 x 5 Thin with Axle Holes on Ends 11478	Black	2×	€0,25 View at LEGO → View
Technic Panel Fairing #22 5L Small Smooth, Side A 11947	Yellow	1×	€0,38 View at LEGO → View
Slope Curved 2 x 2 x 2/3 15068	Yellow	4×	€0,13 View at LEGO → View
Technic Link Tread with Beveled Edge 15379	Black	86×	€0,13 View at LEGO → View
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) 15573	Black	1×	€0,06 View at LEGO → View
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] 18575	Tan	1×	€0,36 View at LEGO → View
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle 18651	Black	12×	€0,08 View at LEGO → View
Technic Pin Connector Round 1L [Beam] 18654	Black	5×	€0,05 View at LEGO → View
Technic Pin Connector Round 1L [Beam] 18654	Light Bluish Gray	1×	€0,05 View at LEGO → View