Bruder Umbau Bruder 7930 conversion

[pedrcri]

Hello,

I am converting a John Deere 7930 to RC. the first steps are to tear the model apart and remove components that are not needed. Then I will install the 2 motors 50:1 which will be attached to a sabertooth 2x5 so I can have differential steering. The steering will be done via a small servo which hopefully will be able to handle the weight on sand or dirt. lastly lights will be added to the cab and front/back of the tractor.

so lets get started with the tear down. not to difficult but this is how I went about it. let me know if you have questions and I can get into more details.

pop off hood should be easy lift it all the way and pull out.


next I remove the stairs. there is a tab under the first step pull up on the tab to let the stairs slide out.


next the exhaust is removed. there is a tab beside the stairs which needs to be pressed toward the engine. the next tab is on the engine and should be pushed toward the cab.


Now the hard stuff! the Cab has 4 tabs to remove from the chassis. they are all part of the glass. 2 tabs on the back and 2 tabs on the front.
you will have to slide a thin pik to push the tabs away from the chassis and pull up. pictures dont really help with how but hopefully you see where they are in relation to the body of the tractor.


with that out of the way you can cut the axle in 2 pieces to remove the rear tires.


still with me? ok well now comes the task of popping off all the clips holding the chassis together. there are some hidden but we will worry about that after. for now. gently lift the ones you can see and slowly move them apart or stick a screwdriver in there to keep them apart. There are a lot of tabs so take your time. I believe I might have missed a few inside there the black radiator is.


Hope that helps for the breakdown. next time we will start working on making the modifications with the new motors and wheels.

 

[pedrcri]

Step 2 is to start cutting and tearing apart the model to get the motors to fit and the servo to fit.

before we cut up the model I make the holes in the rear wheels to fit the hub to attach to the motor. a Step drill works really good here. I cut all the support pieces on the back of the wheel so that it is flat.

Then step drill and make holes for the screws to attach to the hub.

First think is to figure out where to start cutting for the cylinder to attach to. I have a bandsaw which makes it easy to cut the plastic and be a little more accurate than a dremel tool.

Next test fit the cylinder with motors to check gaps with wheel well and spacing between wheel and center of vehicle. some trimming will be done to make it fit
just right and aligned. I will then paint the cylinder pipe and make final fitment of the motors with a set screw so the motors dont move. A lot of hot glue will hold the cylinder in place.

You can see the hole for the servo is also made. there is a plastic bracket inside the model that is conveniently placed by bruder to hold the servo at the right hight.
Servo is an HS-82MG Hitec servo. it should have enought power to handle the weight and turning in the sand.

Next I start to work on the cab and the lights. there are 4 tabs inside the cab you need to pop so you can take the green roof off. once you remove those there is some room to place the lights and the wires to run inside the cab. I used some heat shrink around the wires to hide them when going throught the cab. and out the bottom.

I used a dremel to open up the light housing on the bruder model. it was to tight for the light to sit in there with the housing for the light. also, I had to make some cuts where the tabs are to run the wires. no picture but you can see where they come throught.

so this is the final look for the lights setup. lights on the nose, top of cab front and back and break lights and turning lights.

Now back to the model. mocking up the components. I decided to stay away from speed controllers and have gone with the sabertooth 2x5. it will help with the differential steering.

that is all I have for now. next time I will show the battery location, steering setup and location for electrical components.

Hope you like this and leave some comments.

 

[pedrcri]

All complete and has differential steering.

check it out

 

[pedrcri]

out working the site

I have had the new tractor out at the construction site and realised that 4wd is a real must with these machines. On hard surfaces it moves with ease. But put it in soft sand and it digs its way to the other side of the planet.
Youtube Link:
https://youtu.be/WLenDVFJId4