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The Ultimate 8043 (modification)
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With complete Photo-building instructions
About this creation
Instructions

Ok, this isn't a MOC, but I did some heavy upgrading to the 8043 motorized excavator which is definately worth mentioning.



It is a very nice model, but there were some things I wasn't happy with:

* Lifting the boom was underpowered
* It used normal batteries
* Bucket was too big, doesn't have a correct rotation point and it's working range is too small
* Working range of the dipper was too small
* Side-effects of "2 drivetrains throug a turntable" were too noticable
* Not all the functions were available simultaniously, switching is neccecary. Moving the boom/dipper/bucket was not possible during rotating.

All this together made it quite a poor digging machine. This could be done better...

So I started rebuilding the model. Now it includes:

* Full independent simultanious controll of all the functions
* Joystick-controller that works just like a real excavator. Based on a desigh by Jason Railton
* 8878 Rechargeable battery
* XL-motor for lifting boom
* PF-lights
* Improved bucket looks and operation
* Improved dipper range
* All the gear-reduction moved to the undercarriage to reduce mentioned side-effects
* Cabin roof

Altogether these mods considerably enhance the playability of the model.

The remote controller deserves some extra attention. It's an adapted version of Jason Railton's Thumbstick, which I found on TechnicBricks Blogspot.



Because it works so well now, I decided to make photo-instructions for this mod so everyone can turn their 8043 into a real mean digging machine. The instructions can be found on my website www.jurgenstechniccorner.com.





Feel free to comment or ask quistions.



Comments

 I like it 
  November 14, 2012
Hey, I recently bought a 8043 set and after putting it together started looking for modifications because I was unhappy with the range of motion and and such and found your modifications. I have used your modifications, and then added a few of my own. I extended the track bed, modified the roof on the cab so a Technic mini-figure could sit in the seat, added a "thumb" over the dipper to be able to pick things up, added a switch so the lights can be turned off to save power for the motors, and swapped around some of the boom, arm, dipper and rotate controllers to where the remotes work the same as the controls in the real thing (I ran one of these for a few years). I am much happier with the model now, I just wish I could figure out the gearing to make the tracks turn a little faster.
 I made it 
  September 23, 2012
Quoting Zaid Ghalid Hi juergen,excellent mod!I'm embarking to execute your mod on mine. However, saw your parts list at brickstore & not sure how to purchase these parts. I'm in Singapore.
Have you tried www.bricklink.com ?
 I like it 
  September 23, 2012
Hi juergen,excellent mod!I'm embarking to execute your mod on mine. However, saw your parts list at brickstore & not sure how to purchase these parts. I'm in Singapore.
 I like it 
  August 19, 2012
great mods well done. i do think that the bucket looks to small and the one in set should be kept but overall an excellent set made even better. i want one .
 I like it 
  April 26, 2012
Very cool mods. I think the XL motor as a lift motor is a good idea. What was lego thinking with that loader bucket on a excavator? I too have made similar mods to this set, but I put the drive motors down below the turn table. I also came up with a different joystick method, I don't think it works as well as that one. Anyway, Great mods. 5/5
  September 21, 2011
Matt, you can check my mod (http://www.mocpages.com/moc.php/263386). It is not so advanced as Jurgen's, but may be helpful for you. It uses only standard battery boxes. Maybe when you see these two mods together, you will be able to create something interesting :).
 I made it 
  September 20, 2011
Quoting Matt Sherwin Excellent modification, your guide would be better if it shown what different bits you added or changed and where you put them etc, also like others the rechargable battery pack is way too expensive so will have to use the standard one, question is is the std one the same size as the mod one? i.e. will it fit into the same place and be able to change batterys easily? Thanks.....Matt
The standard batterybox is bigger & heavier than the rechargeable battery, you'll have to adapt the model.
  September 20, 2011
Excellent modification, your guide would be better if it shown what different bits you added or changed and where you put them etc, also like others the rechargable battery pack is way too expensive so will have to use the standard one, question is is the std one the same size as the mod one? i.e. will it fit into the same place and be able to change batterys easily? Thanks.....Matt
 I made it 
  June 21, 2011
Quoting Maximilian Worm Hi, i hope you andestand my english. Sry im german and my english is very bad. I downloaded you instructions of model 8043 but i can follow the steps. Can you write in german too to me perhaps to desripe the things you use step by step of your modifikation. i need it more detailed. i hope you answer me best regards also you can write to me a email
If you send an email to info@jurgenstechniccorner.com, then I'll try to answer your questions.
 I like it 
  June 17, 2011
Hi, i hope you andestand my english. Sry im german and my english is very bad. I downloaded you instructions of model 8043 but i can follow the steps. Can you write in german too to me perhaps to desripe the things you use step by step of your modifikation. i need it more detailed. i hope you answer me best regards also you can write to me a email
 I like it 
  February 15, 2011
Hi Jurgen, Love this mod, I got 8043 for my birthday, and loved the challenge of putting your mod together mostly from parts from other models I have. As Billy says I also don’t have a rechargeable battery pack so had to fit the standard Lego one in. I also have many buckets but none seemed to be the same as the one you used. I have also made your RC cars thanks for the time you put into presenting your creations very appreciated.
 I like it 
  February 14, 2011
very cool
 I made it 
  January 29, 2011
All you need is the 8043 and all the parts on the parts list on my website www.jurgenstechniccorner.com.
Quoting micha rayfer Hey Jurgen I'm going to buy the 8043.I downloaded the part list from your website.I undestand that I need to buy the parts that don't have an image.Do I need to buy more parts ? if yes,pls specify. Thanks Micha
 I like it 
  January 29, 2011
Hey Jurgen I'm going to buy the 8043.I downloaded the part list from your website.I undestand that I need to buy the parts that don't have an image.Do I need to buy more parts ? if yes,pls specify. Thanks Micha
 I like it 
  January 20, 2011
Great ideas. I just got all the parts needed and built it, with the exception of the rechargable battery pack, that alone was going to be more than the rest of the parts! I now have to decide whether to just buy it for find a way to make the current battery pack fit. I have to say, while there were a few confusing spots in the directions, I am very glad you took the time to make it so easy to take a model lego, in my opinion, missed the mark on and made it fantastic. Not having to shift gears to use the functions is great, especially since the thing never shifted very well in the first place. I am loving the remote control setup you recommended too. Thanks for the great work!
 I like it 
  January 16, 2011
I will study the exact contruction late, but only from reading the motivation of making th model say to me: This is exact what I am thinking of some LeGO models. You're my brother in mind! Cool. I am new to this community and I will later introduce my designs, which are based on exact the same motivations! As I wasn't able to convice my wife to make this set my christmas present it will take some time until I can ckech this here out. Sorry ;-)
 I like it 
  December 30, 2010
Many thanks for the instructions and the parts list!! Finally I got the rechargeable battery box and I'm very very happy with this set. Very good job man!! Thanks so much and happy new year! ;)
 I made it 
  December 9, 2010
Hi Ralf, Yes, there is a parts list on the "instructions"-page of my website http://www.jurgenstechniccorner.com. Please scoll down and you'll find it together with the building instructions. It's a brickstore file. If you have more questions, you can mail me at info@jurgenstechniccorner.com. Here's the direct link for the parts list: http://www.jurgenstechniccorner.com/instructions/8043%20Parts%20list.bsx
Quoting Ralf Piel hey Jurgen, do you have a part list to built it like that? I looked at your homepage but i didn´t find it :( i have not so many parts so i have to buy many little parts that you need to built it.
 I like it 
  December 9, 2010
hey Jurgen, do you have a part list to built it like that? I looked at your homepage but i didn´t find it :( i have not so many parts so i have to buy many little parts that you need to built it.
 I like it 
  November 28, 2010
oh yeah, is a very good
 I made it 
  November 3, 2010
Quoting jeje repsol Bonjour Jurgen, je trouve tes modifications exceptionelles, as tu une liste des pieces necessaires pour la faire et ou une notice. Merci
I'm working on a parts complete parts list now. It should be ready this week.
  November 2, 2010
Bonjour Jurgen, je trouve tes modifications exceptionelles, as tu une liste des pieces necessaires pour la faire et ou une notice. Merci
 I made it 
  November 2, 2010
Hi Max, Yes, I noticed that the link was wrong, and it was fixed yesterday. So you can download all the parts.
 I like it 
  October 31, 2010
Hello Jurgen, great mod. Congratulations. I just downloaded your instructions. Please note there´s a little problem with the download links on your homepage. When trying to get part 3 the link directs you again to part 2. Maybe you can change this. Other users should know that anyhow it´s possible to get it now by changing the last digit in the address-line (f. ex. change the ...202.pdf manually to ...203.pdf) and you get part 3. Keep on tuning. Thanks a lot. Best regards Max.
 I made it 
  October 30, 2010
A parts-list of the required extra parts is planned for november.
 I like it 
  October 29, 2010
Amazing! Very nice work! I want to try it! Could you take the time and make a detailed extra part list? Because I do not have extra parts and would like to know what to buy and some pictures are not sharp. It would be a big help! You could work for LEGO :)
 I like it 
  October 29, 2010
This is the best MOD what i've ever seen! When i get the excavator, i'll rebuild this MOD!! A partlist will be very helpfully. Greets Daniel
 I like it 
  October 27, 2010
This is totaly awesome!! A parts list for this mod would be great so you could see what to get hold of to build this modded version :)
 I made it 
  October 21, 2010
Quoting Routemaster x Jurgen, I just read on Eurobricks you will rebuild the original 8043 and your mod for a partslist. Could you try to find a better solution for the drive of the tracks? It's all okay when the excavator drives straight but a real pain when just one track drive is needed to turn the excavator. Mostly the track drive from the one with the longer gear train. Would be really nice to read a comment of your thoughts here.
Hi Routemaster, I was planning to rebuild them only to make the parts lists, not to modify them, because IMO, the model works well. What problem do you have with the track-drive?
  October 20, 2010
Jurgen, I just read on Eurobricks you will rebuild the original 8043 and your mod for a partslist. Could you try to find a better solution for the drive of the tracks? It's all okay when the excavator drives straight but a real pain when just one track drive is needed to turn the excavator. Mostly the track drive from the one with the longer gear train. Would be really nice to read a comment of your thoughts here.
 I like it 
  October 12, 2010
Bonjour JURGEN, Bravo pour cette adaptation du set 8043. Je l'ai réalisé grace à tes instructions et le résultat est fantastique. Cette machine est devenu très agréable à utiliser. Une petite remarque si tu permets, les commandes de la pelleteuse ne sont pas en phase avec une machine réelle mais il est très facile de modifier les branchements pour qu'elles le soient. Encore BRAVO
 I like it 
  September 20, 2010
Brilliant, And the joystick control, i have to copy that one....
 I like it 
  September 19, 2010
Many thanks for the instructions of the 8043 MOD. Finally I got the rechargeable battery box and I'm very happy with this set now. Still thinking about swaping the position of the battery box and the single RC receiver because of the cable between RC receiver unit and battery box. Thanks again for all your efforts, Ralph
 I like it 
  September 12, 2010
These are some brilliant modifications, you really made the model better than the original, I love the improved functions, great job
 I made it 
  August 20, 2010
Quoting Hug Fr Thanks a lot for your answer which is very useful : now I can see which stuff I'll have to buy ! I know you already made a great job with your mods and building instructions but I think a complete list of parts which are not in the original set could be a great enhancement that could encourage people to try it. As an exemple, I do not have so much studless stuff and I would like to know if I'll have enought of them before beginning to follow your intructions. Just one more question. Is it possible to try your mods although I would like to keep the original box for batteries ?
Propably it would be possible. I would not recommend it, for 3 reasons: (1) the 8878 is much lighter than the regular batterybox and the back of the upperstructure is quite heavy already (2) The 8878 is much smaller. The normal battery-box would have to be placed a bit higher to fit. (3) The 8878 performs better than normal alkaline batteries, cause it gives a more constant voltage. You'll understand that I won't make a 8043-mod with the normal battery-box. I might make a parts list for this mod though.
  August 20, 2010
Thanks a lot for your answer which is very useful : now I can see which stuff I'll have to buy ! I know you already made a great job with your mods and building instructions but I think a complete list of parts which are not in the original set could be a great enhancement that could encourage people to try it. As an exemple, I do not have so much studless stuff and I would like to know if I'll have enought of them before beginning to follow your intructions. Just one more question. Is it possible to try your mods although I would like to keep the original box for batteries ?
 I made it 
  August 19, 2010
Quoting Hug Fr I would like to try your mod but, before, I would like to know if you made a list of pieces which are not supplied with the original set. Are there a lot of it ?
I don't have a parts list. The most importand additions are: 1x XL-motor 1x M-motor 1x PF-Receiver 1x 8878 rechargeable battery 2x PF-lights The rest is pretty standard stuff: 8z, 16z and 24z gears, some extra liftarms, axles, connectors, that kinda stuff. Hope it was helpfull.
  August 19, 2010
I would like to try your mod but, before, I would like to know if you made a list of pieces which are not supplied with the original set. Are there a lot of it ?
 I like it 
  August 18, 2010
Fantastic mod, I definably have to try this when I get the excavator
 
By Jurgen Krooshoop
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