Clash of the Titans: 3 times KrAZ 255B 6x6

[2LegoOrNot2Lego...]

As a tribute to this truck this project shows some of the unlimited possibilities. It is a model of a KrAZ 255B 6x6 off-road truck which is used for extreme applications. 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?

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.

Actually you could build this yourself. Building instructions and inventory/parts list are available. 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 T14" KrAZ 255B 6x6 till you finish it with about 290 different parts totaling 1800 pieces.

Scale: 1:17,5

Length: 477 mm (+ trailer 926 mm)

Weight: 1,92kg (+ trailer 2,41kg)

Parts: 1840 (+ trailer 2270)

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.

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 has Rubber Belts installed instead of shock absorber. It's double rear axle setup is fitted with a tandem bogie suspension. The use of this setup allows easy axle and wheel travel. 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.

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 acts as the actual weight. 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.

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. Finally the partial chassis with the axles and bolster attached is slidable. Allowing the full log combination to haul different lengths of logs.

Edited April 11, 2017 by 2LegoOrNot2Lego...

[Pat-Ard]

Very cool trucks...

Are the blue rims dyed or painted???

[Edwin Korstanje]

Very cool model and concept Igmar .

@Pat-Ard. I think that only the logs are not real LEGO®

[Pat-Ard]

OK, I've never seen those wheels in blue...

[Edwin Korstanje]

This is the rim he jused http://www.bricklink.com/search.asp?colorID=7&itemID=101301

[2LegoOrNot2Lego...]

Very cool trucks...

Are the blue rims dyed or painted???

Thanks for the kind words! Those are standard rims as VFracingteam linked to...

Very cool model and concept Igmar .

Thanks buddy...

This is the rim he jused http://www.bricklink...alt='' />

Yep those are the once. If I am correct only used in a SW set, but I don't mind. Those blue rims looking just amazing IMHO...

[Pat-Ard]

Yes, those rims are really cool...

[jorgeopesi]

Cool trucks again .

[deraven]

So awesome. They look spectacular, and have great functionality as well- what more could you ask for in a MOC?

The steered trailer on the logging truck is an especially nice addition.

[Henkl]

Hi Ingmar, as allways a nice truck. Love your work and i am happy that i saw them in real life.

What is your width over the fenders. I use 18 studs and efferman 19 with the normal trock tyre.

[Zerobricks]

These looks really great! I like how you can change their function in a few minutes, the fun never ends.

Can we see the undersides?

[2LegoOrNot2Lego...]

To start with: thanks to all for the kind words!!! Working on a MOC always is great, having it posted on the web too and having these nice comments make it complete...!!!

So awesome. They look spectacular, and have great functionality as well- what more could you ask for in a MOC?

The steered trailer on the logging truck is an especially nice addition.

Agree with that for 100%. For me that is really important. Building a MOC is just pure fun, but I really want my engineering "brain area" to be activated as well...

For both off-road trucks and log trucks I have a soft spot ever since I was a kid. Having these combined really was appealing to me. Already building this KrAZ and searching the web I found pictures of a log truck application so that had to be included as well!!!

Hi Ingmar, as allways a nice truck. Love your work and i am happy that i saw them in real life.

What is your width over the fenders. I use 18 studs and efferman 19 with the normal trock tyre.

Fair question, my "normal" truck are all 18 studs in width when it comes to the front end of the truck. The double rear wheels however have a overall width of 19, I don't want it to be, but because the tires are actually to wide compared to real live tires it is as it is. This KrAZ including the front fender extenders is 20 studs, but including the wheels it is 22 studs wide.

These looks really great! I like how you can change their function in a few minutes, the fun never ends.

Can we see the undersides?

Building this MOC I had to choose what application to give this truck. In time I started thinking about giving it four and making it able to be changed easily. As you know I will have instructions for this MOC available as well it would be nice for those who build a copy for there own could have added playability...

About the underside, there will be a video soon which will probably show a little of it...

Edited September 6, 2015 by 2LegoOrNot2Lego...

[MajklSpajkl]

Absolutely awesome trucks. They remind me a lot of your Kenworth 953 Oilfield truck, which is still my favourite MOC of yours. I wish you made instructions for that one . However, these three puppies will be a sweet treat as well. Do you plan to make separate instructions or will you offer the whole-bunch-in-one?

Those blue rims really look nice, I bought me four of those, but now I see some more would be very usefull. I'm just affraid these trucks will raise the price on them

Best regards.

[2LegoOrNot2Lego...]

Thanks! These off-road trucks like KrAZ and US oilfield trucks and other types as well are really appealing to me... There toughness and being able to negotiate any kind of terrain is really my thing So yes it does remind me as well of the KW 953 for sure.

Unfortunately the KW, which is teared apart already a couple of years ago had to many flaws. So for me unworthy to have building instructions for it. However, no promises yet there might be a MkII of that Oilfield Truck someday with instructions, but not anywhere soon I am afraid...

For each color there will be a different building instruction (because of the parts list) but it will include all four editions. So having invested in the instructions and parts for let us say the White version enables you to build the log truck with stinger steered trailer as well as the trail truck and those other two editions...

Does that make sense?

Fell in love with those Blue rims as soon as I noticed them. Even though only being used in a SW set it is really affordable, so I bought 10. Not sure what to do with them yet, but had to have these... Finally I gave use to them with this KrAZ and love them still the same :laugh:

Yes I agree with you, most likely the price will increase...so be fast!

Edited September 7, 2015 by 2LegoOrNot2Lego...

[lcvisser]

These are awesome. I love the color scheme and how you managed to put so much functionality in them while still maintaining the aesthetics. Great work, as usual!

[Sylvian]

Have you been playing spintires lately? Ghehe. Awesome work :) . I love it as usual :D

[Lucio Switch]

Really cool Trucks! Great job!!

[2LegoOrNot2Lego...]

Thanks again for the comments, as always much appreciated!!!

These are awesome. I love the color scheme and how you managed to put so much functionality in them while still maintaining the aesthetics. Great work, as usual!

As we all MOC builders do I evolve/develop. More and more I am capable of having both of best worlds. There is always a little compromise to both, but less compared to a couple of years ago...

Have you been playing spintires lately? Ghehe. Awesome work :) . I love it as usual :D

No I haven't, but noticed a lot of images on the web... Useful stuff! You know building a models a lot of info and images is required. Searching the web I encountered loads of images and those include gaming images...

[Sylvian]

I wouldnt be surprised if you actually liked the game.... anyhow as some i am also curious about the underside of this well crafted piece of awesome machinery ;)

[technicbuilder]

Hello Ingmar,

One's again a really great truck you have build,the 3 different combinations you can choose.The red one with the wood trailer it's the one i really like.

A few years ago i had the chance to dive with a US truck also a 6x6 , a simular model like the Kraz,this truck had a 6 cilinder White diesel engine with a big Turbo,the power of this truck in off road condition was just amazing.

[Blakbird]

Very nice! What size tires does it use? Is it as big as your Kenworth 953 oil field truck?

[2LegoOrNot2Lego...]

Hello Ingmar,

One's again a really great truck you have build,the 3 different combinations you can choose.The red one with the wood trailer it's the one i really like.

A few years ago i had the chance to dive with a US truck also a 6x6 , a simular model like the Kraz,this truck had a 6 cilinder White diesel engine with a big Turbo,the power of this truck in off road condition was just amazing.

Well, now I am officially jealous Thanks for the kind words and even though the Red one is the last one that joined this family it is my favorite as well. Personally I prefer the ballast tractor... The YaAZ-238A V8 has no turbo so I am not sure it is really powerful. On the other hand there were a lot in use so that is not without any reason I assume

Very nice! What size tires does it use? Is it as big as your Kenworth 953 oil field truck?

Thanks for the kind words. No it is not as big as the KW, it is fitted with 45982 "Tire 81.6 x 38 R Balloon". With these fitted there was no need to have any gear reductions in the hubs. The rebuild KW will have hubs with gear reduction, but we have to wait any longer for that to happen...

[2LegoOrNot2Lego...]

As an update, instructions are available for both the Yellow and Red version... So if you are interested to build one, or more yourself, please go ahead! The White version will follow soon!!!

A note for these instructions, these will be issued in three stages. Last two will be added as updates to the first initial instructions. It only takes a little bit longer to build all different applications! On the other hand this makes it exciting, starting with it as a semi...

Stage 1: For now the instructions show you exactly how the truck is build entirely including the installation of the fifth wheel. This means you will have it ready as a semi-truck and you can start enjoying it!

Stage 2: Within a couple of weeks the log truck edition will be added. Meaning it will by then also include the trailer that goes with it! This will happen approximately the fourth week of November!

Stage 3: Finally it will be completed with two more applications. That makes you able to build both the ballast tractor and the trial truck. The estimated date for this to happen would be the third week of December!

As an extra there also will be a converter dolly added to these instructions to make it tow the detachable gooseneck lowboy trailer as well!!!

[2LegoOrNot2Lego...]

Probably I am already known for this... :laugh: ...again late with the video on these models... Finally after a couple of months I have uploaded and shared a video, one of a series of movies on these trucks... I really would like to show people hove versatile this truck is, even as LEGO model...

[Bricker Bricker 72]

this is mine black edition of the krazz with winch and a off-road trailer (moc).

for foto's, video's and more info look at my:

Flickr: http://www.flickr.com/photos/brickerbricker72/albums/72157668481006094

You Tube: http://www.youtube.c...rickerbricker72

Edited July 25, 2016 by Bricker Bricker 72