Make a GBC out of the 42167 Mack® LR Electric garbage truck

12 February 2025

The LEGO® Technic set 42167, the Mack® LR Electric garbage truck, offers builders a realistic representation of a modern garbage truck. With features such as a side loader for grabbing, lifting and tipping trash, realistic steering and included trash cans, this set encourages creative and technical understanding in children. But you can also make a whole lot else out of this set.

PV-Productions has transformed this set into a functional Great Ball Contraption (GBC) module called "GBC 58 Dump 'n' Drop." This module is constructed entirely from the parts of the 42167 set and acts as an alternative building option. The design was created in collaboration with Noad de Lange, Petter Breedveld and Ben Jonkman.

The "GBC 58 Dump 'n' Drop" module consists of an input bin, a mechanism and an output ram. The feed tray can hold several GBC balls and features a rotating wheel that prevents the balls from getting stuck by guiding them left or right toward the lifting arms. These lifting arms move in a 180-degree phase shift relative to each other. When a lifting arm moves downward, it activates a mechanism that loads one GBC ball into the bin of the lifting arm. As it moves upward, the ball is quickly raised and ejected, then guided through a wall to the next GBC module. The whole thing is manually driven by a lever that must be turned clockwise, but can also be motorized according to PV-Productions' instructions. For this, you can easily click a LEGO® motor onto the module.

Free building instructions

For builders interested in creating this GBC module, PV-Productions offers free detailed building instructions. These instructions include explanations of the mechanisms, tips for fine tuning and information on motorizing the module. Although the instructions are free, PV-Productions emphasizes that they should not be distributed without permission.

With the "GBC 58 Dump 'n' Drop," LEGO enthusiasts can expand their existing GBC setups and learn new techniques in terms of gearing, timing mechanisms and robust construction. The project demonstrates the versatility of the LEGO 42167 set and inspires builders to get creative with limited resources.

About LEGO® Technic

Technic is the theme for LEGO® fans who enjoy building ingenious, moving sets. LEGO® Technic creations are full of ingenious building techniques that mimic reality. LEGO® Technic is therefore also an advanced theme, but also suitable for slightly older children with an interest in technology.

At ToyPro you will find a large collection of LEGO® Technic sets with which you can build cars (including super cars), trucks, ships, cranes and helicopters, among other things.

Buy technical LEGO® parts

Have you lost a part? At ToyPro you can order LEGO® Technic parts in addition to complete sets. We have an assortment of over 1600 different technical LEGO® bricks. Not sure which part you are missing? On the product page of a set you can see which Lego bricks are included in that set.

Do you want to go beyond the standard sets and build your own Technic MOC? Then ToyPro is the LEGO® Technic parts store for you. On the LEGO® Technic parts page, you can browse through subcategories such as axles, connectors and couplers. You can also filter by size to find the Technic parts you need. In addition, you can also search by LEGO® Design ID and Element ID.

With every purchase of single parts you earn ToyPro credits. With these credits you save for a nice discount on your next purchase. If something doesn't go right with your order, our customer service team will quickly fix it for you. Finally, our employees will make sure that you receive your order quickly.

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