[MOC] Remake 8455 - Pneumatic Backhoe Loader

[Pales27]

Hello everyone!

This is my pneumatic backhoe, redesign of the classic 8455 set.

Main features:

• motorized wheel drives and steering (power funtions)
• motorized air pumps
• 7 pneumatic functions
• 2 speed gearbox
• lights (power funtions)

Building Instructions available on Rebrickable:

https://reb.li/m/228753

[1gor]

That MOC is very very interesting...I see powerfunctions and BuWizz battery box (something I have in my inventory).

Looks very nice, the only complain?! is that it is not fully RC

[Pales27]

2 minutes ago, 1gor said:

That MOC is very very interesting...I see powerfunctions and BuWizz battery box (something I have in my inventory).

Looks very nice, the only complain?! is that it is not fully RC

My dream is that one day I will be able to create the complete RC version as well :)

[allanp]

Front paged. Welcome to Eurobricks @Pales27. Fantastic model for sure. I think having RC drive/steering and directly operated functions is a fair compromise at this scale. To include more functions to the already impressive list of functions would require a larger scale and right now you're limited to the size of the pneumatics, especially with the rear main raise and lower function. But look how well 1 L motor can power 7 functions with good performance . My only wish for this medium scale back hoe would be to somehow squeeze in a larger compressor or tune the gearing to the compressor to get the maximum power out of the motor. I think you might get away with a 1:1 gear ratio instead of your current 3:5. But as it is, it's great! 

[Paul B Technic]

Amazing work.

[Pales27]

4 hours ago, allanp said:

Front paged. Welcome to Eurobricks @Pales27. Fantastic model for sure. I think having RC drive/steering and directly operated functions is a fair compromise at this scale. To include more functions to the already impressive list of functions would require a larger scale and right now you're limited to the size of the pneumatics, especially with the rear main raise and lower function. But look how well 1 L motor can power 7 functions with good performance . My only wish for this medium scale back hoe would be to somehow squeeze in a larger compressor or tune the gearing to the compressor to get the maximum power out of the motor. I think you might get away with a 1:1 gear ratio instead of your current 3:5. But as it is, it's great! 

Thank you very much! This is my favorite childhood set, I spent a lot of time to disegn it. Yes the L motor has enough power for 1:1 gear ratio for the pumps. It is up to you which gear ratio do you prefer if you build it :D For me easier to handle the backhoe cylinders with this ratio (less air) and the L motor has an easy job too :D

I hope one day lego will introduce RC pneumatic valves and I will be able to build it into my model.

Edited November 22, 2025 by Pales27

[Jundis]

Beautiful recreation of the original!

I always wondered when Lego will this tire combination in a model. As it seem they are not willing to do so, you gave me the answer :D

For my taste it didn't even have to be motorized, but implementing it into the already cramped room cause of the pneumatics, it makes it even more impressive.

[gyenesvi]

Nice work cramming al those functions in there along with the RC drive / pump! It really shows how hard it is even just to route all the cables / switches, even without RC pneumatics.

[Aleh]

One of my favourite sets ever. 

MOC is great, especiall technically! 

From my pb this 5*11 panel instead of the bonnet simplifies the overlook. But this is a questionn of a personal taste :)

Will consider building this to learn something new :)