Trial Crawler, features drive, steering, winch, suspensions, gearbox, fake engine and orange color !
Direct purchase of the instructions
Preview of the instructions at the end of the article. Presentation Video (YouTube).
Regarding my previous Trial Vehicle, all were trucks, that is why I wanted to build a new trial vehicle with new design : a crawler. For that purpose, I wanted to use the Unimog Parts sold by Lego, notably : ball-joins, shock absorbers, panels and frame. The drive is operated by a XL motor with 12/20 and 8/24 reinforced portal hub wheels. The steering motor is located on the left side of the crawler and operates 2 cv-joins, 12/clutch and 8/24 which ensures a good reactivity and strength on the steering. Concerning the chassis, it is composed of two levels of beam which encircle the XL motor, gearbox and the battery box. The axle are live axles with 5 points : the massive ball-join, the two connecting rods, and the two shock absorbers attached to the upper level of the frame.
The crawler is also equipped with a winch located under the bonnet and a gearbox. The gearbox controlled the two outputs of the motor, either the drive, or the winch. The driving ring is simply operated by the red change over-catch located near the dashboard. This principle of functioning allows the wheels to rotate when the winch works. I have tried to link the winch with the wheels but the results were really problematic due to the slipping of the wheels on mud slopes. With this solution, I can operate the winch only or the drive only which is reassuring for the two devices.
Also, in order to have a nice design, I have considered different places for the engine and the best was on the rear with a big detailed engine. For that, I used chromed bricks bought at Chrome Block City and lot of special part like the gray panel or tailpipe bricks. Concerning the result : it is exactly what I wanted, looks good and big with a powerful impression. To continue with the design process, I have also considered lot of solutions to design the global shape. I wanted to use the orange panel, but they are in low quantity in the unimog. That is why I have chosen the black color for the frame in order to match with the orange color. In order to stay in crawler design, I have made a tube-shaped design which has the advantages to be light and easily removable. To conclude with the climbing abilities : video says more than thousand words.
I have created firstly a dismantling sequence. I wanted after some years to offer a better looking instructions with modernized parts usage, Here it is, thanks to ForelockMocs who have made a great job making a professional instructions. The building instructions are a PDF of 127 pages step by step computer rendering building instructions in a same way Lego do. The bill of material is available here :
You can buy the building instructions for 10€. You can also buy other building instructions and get an automated discount. You will get 15% off for 2 PDF, and 20% off for 3 PDF on the total), available for all the instructions for sale on nico71.fr.
See it on the shop :
After your payment, you will be redirected to a page for downloading your instructions, and will receive also the link to download by email. Please check the spam box and be patient to receive it. If you have trouble to download your copy of the PDF after payment or open the document, do not make a paypal dispute, please contact me using the contact form. The link to download the instructions expires within 24h. Contact me if you have lost your instructions. Note that you can print it, but not copy or distribute. Thank you for supporting my work 🙂
Free Photo Sequence
This is a photo sequence of dismantling in reverse order that I have taken initially, some parts usage are a bit outdated. You can download the PDF and see the bill of material in the following links :