Truck T12 MkII Mack Granite

MOC designer Ingmar Spijkhoven

Difficulty: Moderate

Posted: Jul 29, 2017

Purchase for $25.00
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Model Mack Granite "Truck T12 MkII" is build with LEGO® in scale 1:17,5 and motorized using LEGO® Power Functions. It is a model of a Mack Granite 6x4 day cab truck. Both the looks and specifications are adjusted to match lowboy ”Trailer Tr4 MkII” and the optional jeep and booster ”Trailer Tr4 MkII Add1”. This rather heavy lowboy trailer combination, which might include a load, requires some extra power.

The truck features: solid axle suspension on all axles of which the rear axle uses tandem bogie suspension, PF powered driving with power transmitted independently to both rear axles, reduced speed to increase power/torque, Ackerman geometry on steering axle, Servo powered steering, fully functional fifth wheel, fifth wheel slider, modeled engine, detailed cabin interior and 3 light units.

Even though this truck is designed to go with this lowboy combination in the first place, it doesn’t necessarily mean it can't be used with other available trailers as well. If you prefer to give it a flat bed or log trailer, you are free to do so!  If a different trailer is used it might be useful to give this truck's drivetrain a various gear setup. For this a separate PDF file is available that tells you what gear reductions to use with which trailer. It also shows you how to do so. Evidently the torque will be reduced, but with lighter weight trailers that is no problem at all.

You can build it yourself! To do so you can buy the Building Instructions. Early in the building process you will see what it is that you are building. You will be very excited from the moment you start the build of "Truck T12 MkII" till you finish it with about 360 different parts totaling 1900 pieces.

As one of the designer's trademarks this truck model is provided with full solid axle suspension on all axles, so including the front steered axle. Regular LEGO® Technic shock absorbers proved too large. Instead Rubber Belts are used, to achieve this the movement is converted using a lever constructions.  What is particularly new to this model is the double rear axle setup. This new setup allows easy axle and wheel travel. Because it doesn't use any shock absorbing the wheels and axles do not have to deal with any force. It is based around the concept of the walking beam suspension.

This Mack Granite model is powered by a Mack MP8 engine which is visible with the hood opened. This power source is an inline 6 cylinder engine with a displacement of 13.0 L. The horsepower range is from 425 up to 505 HP and this engine has a torque range from 1570 to 1760.  This detailed MP8 engine is nice to build and to give it those realistic looks a total number of 55 parts is used. It is detailed with for example engine oil dipstick, fan, fan belt, pulleys, hoses, oil filters including by-pass oil filter and a turbo.  Together with much more engine bay details which are added the looks are phenomenal. These include break fluid reservoir, windshield washer container, internal air cleaner system with tubing and steering shaft.

A lot of detail is added to the cabin's interior as well in the colors Dark Bluish Gray with some Reddish Brown details. By opening this model’s doors one can access the cabin. The interior's colors, which is quite dark, really standout because of the truck's body work mainly Orange color.  For the driver's comfort the interior has gauges, switches and comfortable seats. Other details are a angled dash and gauge panel, a steering wheel and a gear shift.

Truck T12 MkII Mack Granite

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