In real life, heavy tractors are neaded to cultivate the land or for haymaking. I build such a heavy tractor with a rake, a vehicle that is attached to the tractor and gathers the grass on one swath. Not many people make haymaking machines like this, so I hope you will enjoy it!
About this creation
Scale model of JCB 2155 with Fella TS-4000
Use of power functions in tractor:
-Steering: 2 M-motors
-Switching between high and low gear: M-motor
-Power take off (PTO): one XL motor. In this model, the PTO is used for raising the four elements of the rake. This XL motor becomes it's energy from the battery box on the rake.
-driving: only one XL motor
-3x receivers in cabin
-2x PF lights
Use of power functions in rake:
-black racebuggy motor: used for powering the four elements with high speed!
-battery box: black racebuggy motor for turning the elements and raising the elements absorb a lot of energy!
text with photo's
Some JCB tractors have a speciality: their wheels have the same size (front wheels have the same diameter as the back wheels). They need this to drive at a higher speed at the road, even until 80km/h. My tractor has also a high and a low gear that is controlled fully radio controll. I will explain the general functions in the tekst under the photo’s.
One photo of the JCB 2155 in real life.
This is the tractor I built. Notice the equal wheels. Do you see something remarkable on this tractor? Yes, the cabin is in the middle, the motor in the front and at the back…? Nothing. I built that also. You will see in the video that there’s a lot of technique under the rear of the tractor.
One function is that of switching between high and low gear. The whole gear box is located under de hood of the tractor in only 7L. This is inclusive the XL-motor and the switch powering M-motor. When you look at the picture, you see that the gears can slide between 20/12 tooth and 12/20 tooth. If you activate this movement by an micro-cilinder attached to an M-motor, you a have high and a low gear.
This model has also the possibility to use crab steering. Crab steering is used to avoid ground pressure damage in muddy fields. The idea behind this is that the wheels don’t drive in the track of the other. I realized this by putting one M-motor per steering axle. So I can steer with four wheels and use also crab steering with four wheels. You understand that this is intensive for the steering and drive system. But this whole tractor is only powered by one XL-motor. I designed extra strong axles and systems so that the differentials wouldn’t slip.
In this photo you see the postion of the battery box. It is not in the cabin (there are the 3 receivers and all cablework…) but low in the tractor. This is good for the stability of the tractor. However, there were also problems in realizing this. The photo below pictures this problem. I solved the problem by using 4 universal joints. So the tranmission is directed roundabout the battery box! The rake
In these photo’s you see the rake. The last photo shows us the function of the rake. As you see, I built this Fella TS-4000 rake with four elements. In the normal farming, this is wide. The rake gathers grass with a unique mechanism. When the "cams" have brought the grass on the swath, they lift up shortly and start then another round, everything with enormous speeds. In jargon they call this a cam track. For a video how a real rake works, click here. (This video is only a good recommandation and explanation for me to you, not for advertisement.)
This photo shows us the power take-off.(PTO) This is powered by the XL-motor. By this the 4 elements of the rake are raised. That is a heavy function (what you can see in the long video), so I used an XL-motor. The green circle shows us the rear linkage (hef). That can be controlled manual by activating a micro cilinder. So you can set the height of the haymaking machines.
I also made photo’s outside. The photo’s above show the result.
The black motor. In LDD I couldn’t put a black motor in it, so you should add it in this way.
I produces a short video and a long video. There was so many video material that the second one became a long video. So I also produces a short video, which you only show the most important functions.
Very nice tractor. I really like the rake and will build it soon. Do you have any more pictures of the tractor in the building stage that you can share with me? It is pretty hard to imagine what is going on under that hood of the JCB!!
It's nearly impossible to make building instructions from the tractor with LDD (lego particles are too compact on eachother). Moreover, I have already broken down this tractor to build other models. But when you look closely to the motor and the photo's of the whole tractor, it ís possible to build it.