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Truck T14 KrAZ 255B 6x6
Model "Truck T14" KrAZ 255B 6x6 is build with LEGO® in scale 1:17,5 and motorized using LEGO® Power Functions®. It is a model of a KrAZ 255B 6x6 off-road truck which is used for extreme applications. The truck features: solid axle suspension on all axles of which the rear axles use a tandem bogie suspension, PF powered driving on all axles 6x6 drive, reduced speed to increase power/torque, Servo powered steering, fully functional fifth wheel, modeled V8 engine, detailed cabin interior and two light units.
About this creation



In general





Model "Truck T14" KrAZ 255B 6x6 is build with LEGO® in scale 1:17,5 and motorized using LEGO® Power Functions®. It is a model of a KrAZ 255B 6x6 off-road truck which is used for extreme applications.
Evidently this model is build with LEGO® (100%) and build in scale is 1:17,5 so it fits the trucks that are already available. LEGO® Power Functions® are used to add realism and playability. It is remotely controlled for both driving and steering and by switching the battery box to on the lights are lit. To add even more realism some cool features are enforced such as a complex suspension system for both the front and both rear axles.
The ability to change its application in only a couple of minutes adds to it at well. It can be simply fitted with a fifth wheel to make it fit a semi-trailer. Just driving around with it being a Trial Truck suites this beast fine. By adding the ballast box it becomes a prime mover to tow for example a drawbar lowboy trailer. Finally it can be fitted with a bolster and by adding the stinger steered trailer it can haul a bunch of logs easily!

Scale: 1:17,5
Length: 477 mm (+ trailer 926 mm)
Weight: 1,92kg (+ trailer 2,41kg)
Parts: 1840 (+ trailer 2270)

As a tribute to this truck this project shows some of the unlimited possibilities. Even though this specific truck was never produced as a civilian truck however after its retirement it has been used as such. Within a couple of minutes it can be changed into one of the four different editions which include:
- Semi-truck with fifth wheel
- Ballast tractor with ballast box
- Trial Truck edition
- Log Truck with stinger steered trailer
So it is up to you what kind of job it does: just having fun as it being a Trial Truck, or will you give it a semi-trailer? Or will it be hauling logs?


Driving and steering





Despite the lack of space to hide, it is a day cab truck after all, some nice ways are found to locate all the required electronic parts, so called Power Functions®. Both L Motors, which are used to power the truck's drivetrain, are positioned laterally on each side of the chassis. The rotation of both L Motors is reduced using a single gear reduction one for each. The power produced by these motors individually is merged by the length differential. To increase off-road capabilities it has limited slip applied.
One out going shaft is powering the front axle, but not without being geared down once more. The second out going shaft of the length differential is powering both rear axles. Both rear axles have there own gear reduction which is equal to that of the front axle. Again limited slip is applied, but to the rear axles only. The front axle is not fitted with it because of the lack of space. The major reason for this is the installation of the Servo Motor on top of the front axle. This location of the Servo Motor enables a firm and direct steering without to much free play.



Suspension on all axles





As one of the designer's trademarks this truck model is provided with full suspension. Regular LEGO® Technic shock absorbers proved too large. Installing those would have compromised the tractor's chassis realistic looks. Instead Rubber Belts are used as shock absorbers. To achieve this the movement is converted using a lever constructions. In the end a spring is pushed in and comes back, a Rubber Belt is stretched and comes back.
This applies to the front axle only, the double rear axle setup is fitted with a tandem bogie suspension. The us of this 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.
Both front and rear axles are fitted with "Technic Steering Wheel Hub with 2 Pin Holes". These hubs have proved to be a real improvement, less friction and the wheels do not bend under the weight of the model as it would without.



Spartan and efficient





As with the entire truck the cabin's interior is spartan and efficient. No unnecessary things are installed or mounted, just only what is really needed. Everything extra can break down as well, so why bother. By opening this model’s doors one can access the cabin. Openable doors give the model very realistic looks and makes the detailed interior visible. For the operator to handle this beast the interior has a steering wheel, basic gauge setup, a gear shift and another shift to engage high or low gear and finally some basic seats.



Under the hood





This KrAZ 255B 6x6 model is powered by a YaAZ-238A V8 4-stroke Diesel Engine which is visible with the hood opened. This power source has 8 cylinders in a V setup with a displacement of 14,87 liters. The initial YaMZ-238 delivered 215 hp with a torque of 785 at 1500 rpm. Since 1966 the YaAZ-238A engine was installed and delivered 240 hp with a torque of 883 at 1500 rpm.
This detailed V8 engine is nice to build and to give it those realistic looks a total number of 80 parts is used. It is detailed with for example air filter, fan, fan belt, pulleys, hoses, by-pass oil filter and the exhaust system.
Together with much more engine bay details which are added the looks are phenomenal. These include break fluid reservoir, multiple reservoirs and details, radiator with tubing and steering shaft.



Semi-truck with fifth wheel





For a basic configuration a fifth wheel is mounted. Because of this a semi-trailer can be hooked up. Since this is a common application it makes the truck extremely versatile and depending on the used trailer it still suites any kind of terrain.
At the rear end of the chassis has wedges installed to allow easy attaching of any semi-trailer. By adding a winch the versatility can even be increased. The battery box is simply sitting behind the cabin and the spare tire is mounted to the truck's roll bar.


Ballast tractor with ballast box





As used to haul extremely large and heavy loads this truck can be fitted with a ballast box. What it basically does is adding weight to the rear axles to improve traction. While fifth wheel mounted trucks have there semi-trailer to add weight to the rear axles it is now replaced with a ballast box.
The truck's battery box is inside this ballast box and acts as weight. If required more weight could easily be added by fitting a second battery box. A spare tire is mounted that fits the truck as well as four spare tires that would fit for example a drawbar lowboy trailer.


Trial Truck edition





To be used as just an off-road truck to fool around with a trail truck body can be installed. To distribute the weight of the truck equally over all axles the battery box placed on top of the rear axles. Even though spare tires are not common for trail trucks two are installed to improve the looks of this truck. It is always impressive to see a truck with these large wheels having some spares. Mounted to the roll bar and easy to access when needed.
To improve the off-road abilities the rear end of the chassis could be changed easily. In order to be able to change this truck to any given configuration the chassis is standard. Shortening the chassis would increase the departure angle of the truck. Also could the approach angle be increased as well by removing the front end's tow socket.


Log Truck with stinger steered trailer





Using this truck to transport logs requires to additions. The first one is a bolster mounted to the truck's chassis. It is sitting directly on top of both rear axles which enable good weight distribution. Second is the stinger steered trailer. Basically this trailer is a large tube with a tow ball at one end and a partial chassis with a bolster and two sets of wheels attached to it.
The two sets of wheels are attached to solid axles which uses the same hubs as the truck does. Essentially the axle setup is equal to that of the truck without the drivetrain. Again it uses a tandem bogie suspension setup which allows easy axle and wheel travel.






To hook it up to the truck it has a tow ball which connect to the truck's tow ball socket. The trailer's bolster is exactly the same of that of the truck and both are foldable. An optional chain across keeps the load secured. Finally the partial chassis with the axles and bolster attached is slidable. Allowing the full log combination to haul different lengths of logs. Both minimum and maximum reach are marked as is the centre location. The latter is used to be stored on top of the truck's bolster using a log loader for example. This is the most efficient way to transport the truck without any load.















Building instructions




If this model is appealing to you there is this chance to have a copy of it yourself! Having a collectors item as this truck is nearly a must. Imagine how people will react if you have this sitting on a shelf in your living! There is always a subject to talk over at every birthday or what ever party...

Creating these instructions both quick progress on your build and being easy to understand were the main goals. 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 this model till the very end when you finish it. It won't be easy to part from it to get a proper sleep or a decent meal.

To achieve this clarity within the instructions a lot of floating parts are used. You know the parts that are not yet located, but have an arrows pointing out where it is suppose to be. Together with a lot of so called "Call Outs" (the smaller windows within a step that shows the assembling of a sub part) together with multi part steps (not adding just a single part per step) the build will be in a flow.



Comments

 I made it 
  July 11, 2016
Quoting Oran Cruzen Excellent creation!
Thanks...glad you like it!
 I like it 
  July 11, 2016
Excellent creation!
 I made it 
  October 7, 2015
Quoting Chris Schimpl First week of october almost over ;) waiting badly for more of this cutie :) great work!!
Yeah, I know...need a little more time... I am working my ... off to get it finished as soon as possible, stay tuned!!! :-)
 I like it 
  October 5, 2015
First week of october almost over ;) waiting badly for more of this cutie :) great work!!
 I made it 
  September 25, 2015
Quoting Steffen Kasteleiner This is a really great and versatile truck! I love the semi and logging version... And the grill is really nicely done, just BTW. Great models:-)
Thank you so much, glad you like it! Actually the front end of the truck was what I started with. The engine bay with hood and grill, so nice you noticed...
 I like it 
  September 25, 2015
This is a really great and versatile truck! I love the semi and logging version... And the grill is really nicely done, just BTW. Great models:-)
 I made it 
  September 14, 2015
Quoting Jens jensen Any news about instruktions Can NOT vait
Yes for sure... First weeks of October! You can not wait you say, but you have to... ;-) Just kidding. Can you please wait for another couple of weeks, I really need all these weeks to create perfect instructions for these beasts!!!
 I like it 
  September 13, 2015
Any news about instruktions Can NOT vait
 I made it 
  September 12, 2015
Thanks again for these kind words. Combining both esthetics and functionality is my main goal. Evolving as a builder, as we all do, both are getting to a higher lever. In the last couple of years my models become more realistic. First model ever build was not a brand or type, just a US truck. Now these days I only want to build exact replicas. Simultaneously being more experienced as a builder the functionalities improve as well...
Quoting Gabor Pauler Instantly recognizable, perfect both in shaping and engineering. I can see a Kraz every day, so its a personal testimony.
Always a good thing when people who know the actual model find them recognizable. Means I did my job well, as well as my homework... ;-)
Quoting Vibor Cavor Wow, there. All that's missing here is a movie to demonstrate the power of these beauties!
Agree and will be taken care of!!! :-)
 I like it 
  September 9, 2015
Wow, there. All that's missing here is a movie to demonstrate the power of these beauties!
 I like it 
  September 9, 2015
Just awesome! Your truck models are very clear and precisely done!
  September 8, 2015
fantastic looking truck...this will be a fun build!!
 I like it 
  September 7, 2015
more amazing builds as always top rate
 I like it 
  September 7, 2015
I really enjoyed watching these amazing trucks. The combination of System and Technic elements makes them realistic and sturdy at the same time. Excellent Work!
 I like it 
  September 7, 2015
A rare combination of function and beauty. One of the best!
 I like it 
  September 7, 2015
Instantly recognizable, perfect both in shaping and engineering. I can see a Kraz every day, so its a personal testimony.
 I made it 
  September 7, 2015
Thanks for these kind words and great to read you like these trucks! Because of the bogie suspension on the rear axles and the use of no shock absorbers give the axles/wheels all the room to move. I agree the travel range is good! Both the rugged looks/bodywork and the functionality/mechanicals are important IMHO. That is what I spend time and effort on to achieve all of this! :-)
 I like it 
  September 7, 2015
Like everything about these trucks -- rugged good looks and excellent mechanicals.
 I like it 
  September 6, 2015
Man I love these trucks. They look so tough. Great job!
 I like it 
  September 6, 2015
Great looking machines! I like both the bodywork and the mechanicals too. The range of travel on the suspension is very impressive.
 I like it 
  September 6, 2015
Absolutely amazing trucks! Look just like a real. Perfect work!
 I made it 
  September 6, 2015
Quoting Joost Cumps Fantastic, as always! Can I ask, you added a lot offunctionality, but it seems to have a simpel chassis , is that sturdy enough for (heavy) play?
Thanks! Yes you may ask off course! :-) Yes it is a simple chassis and yes it is sturdy enough for heavy play. Because of the suspension there will be not much stress on the chassis. Also did I notice that the chassis of for example a 6x6 must not be to sturdy, it needs to be flexible in a way... Thanks for asking!
 I like it 
  September 6, 2015
Fantastic, as always! Can I ask, you added a lot offunctionality, but it seems to have a simpel chassis , is that sturdy enough for (heavy) play?
 I made it 
  September 6, 2015
Quoting Seaman SPb Fantastic work!
You're fast :-) Thanks for the kind words!!!
 I like it 
  September 6, 2015
Fantastic work!
 
By 2LegoOrNot2Lego Ingmar Spijkhoven
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