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The ACCO super dozer is loaded for transport from the Acco depot in Portogruaro to its new home on May 15, 2012. (Mauro Dal Santo/Marco Castellan photo)
In the early 1980s, Umberto Acco, an entrepreneur and owner of a civil construction company in Portogruaro, northern Italy, received a job that would require his company to build a custom crawler dozer and motor grader.
The machines needed to be big — really big — and were intended to be used on a project that involved moving earth — lots of earth — in large, desert areas.
While many components of the dozer had to be custom made, including the blade, Acco used mainly Caterpillar parts to build what has become known as 'Super Dozer'— the world's largest bulldozer.
As of 2018, it also is the most powerful tracked dozer ever made.
The specs for the more-than-40-ft., 183-ton crawler dozer are dizzying. Two 8-cylinder, 675 hp Caterpillar diesel engines combine for a 1,350 hp output. The blade measures 23 ft. wide and 9 ft. high. The rear ripper (a claw-like device) measures 10 ft. and is powered by hydraulic rams.
The tracks were custom made by Berco. The transmission operates through two drive sprockets for each track to create torque generated from the engines. The brakes and control mechanisms are operated hydraulically. This massive piece of iron was the only one of its kind produced.
For comparison, Caterpillar's largest model, the D11 dozer, is 115 tons, 35.8 ft. long, 14.9 ft. wide, had a 22 ft. blade and operates at 850 hp.
The world's largest production dozer is Komatsu's D575A 168-ton, 1,050-hp dozer. This machine measures 38 ft. 5 in. long, 24 ft. 3 in. wide and has a 11 ft. 11 in. blade.
The world's biggest motorgrader also was created in 1980 for the same project. It had two engines: the 700 hp front end articulated from the 1,000 hp rear end. It measured more than 24 ft.; weighed 200 tons; had a 33 ft. blade; and had a total of 12 tires — two per hub.
While in storage, the machine became a tourist attraction. It did not survive its time in storage and has been dismantled and sold for scrap.
The dozer and motorgrader were to be used for a massive earthmoving project in Libya. It is unclear whether the machines were to be used for a pipelaying project or for other land-development but just as the dozer was completed, Colonel Gaddafi encountered an embargo by the United Nations, which included trade restrictions. The ACCO dozer and motorgrader could not be shipped to Libya.
The dozer was operated only once on a job in southern Italy. However, the cost of transporting it was prohibitive and both machines were placed in storage and maintained at the factory where they were built.
Umberto Acco passed away in 2006 without appointing successors to the company. The decision was made not to continue with Acco's innovations and the business was shuttered. The property became a dumping ground for various earthmoving machines, including the giant dozer and motorgrader.
In 2012, an old friend and neighbor of Acco, Dino e Rino Valerio, who also is a collector of historic vehicles, saved the dozer from demolition. He purchased the monster machine and arranged for heavy transport to a new location. Although Valerio passed away in 2012, today the dozer is safely stored and on display with the rest of his collection for public viewing at the family's Bejaflor nursery.
Sources for this article include:
facebook.com/AccoDozer/?ref=page_internal; en.wikipedia.org/wiki/Acco_super_bulldozer; forums.dhsdiecast.com/default.aspx?g=posts&t=120813; acmoc.org/bb/showthread.php?27525-The-ACCO; translate.google.com/translate?hl=en&sl=it&u=http://www.portogruaro.net/news/scheda.php%3Fcategoria%3D14%26news%3D30377&prev=search; khplant.co.za/blog/article/world%E2%80%99s-largest-motor-graders
Super Dozer on the move.
Options · View Tarantula Posted: Monday, May 21, 2012 6:02:22 PMThe infamous ACCO super dozer has been moved to a new location, here are som clips.On trailer.Driveing dozer to new resting spot.//Niklas Eriksson
RowanH Posted: Monday, May 21, 2012 7:50:49 PMWOw, I would have loved to have seen these but the videos have been removed!EDIT: I had a quick search and came up with this one...Rowan.
Rossco Posted: Monday, May 21, 2012 8:12:53 PMInteresting if they put it to work.I wager it won't run a week. Down time will be minimal thou as parts availability shouldn't be a problem.
Tony65 Posted: Monday, May 21, 2012 8:17:43 PM Rank: Member
Looks like it's under a bridge or expressway.
Is it being put to work or for a museum?
Looks like it's under a bridge or expressway.
Is it being put to work or for a museum?
Rumor is its going to workBut the rumour mill is rife in the Mining / Construction / Equipment world
janh Posted: Monday, May 21, 2012 9:46:58 PMNo,it´s not going to work anymore.It was bought by a collector who will show it to the public at the new place,whilst the famous grader has obviously been taken apart and went to the scrap yard.Jan
Shovelman Posted: Monday, May 21, 2012 11:22:01 PMIt's nice to know that it's being preserved for the time being. I'd like to know how many man hours were involved with prepping her for the move after sitting for decades?Jan,Did this relocation take place recently? Also, can you share with us who the collector is or where the machine resides now?
FiatAllisHD41 Posted: Tuesday, May 22, 2012 1:18:46 AM Rank: Advanced Member
Now that's something you don't see everyday. Anyone know what engine is in it,sounds great after sitting ? Thanks for sharing.
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Now that's something you don't see everyday. Anyone know what engine is in it,sounds great after sitting ? Thanks for sharing.
Twin CAT 675 hp
janh Posted: Tuesday, May 22, 2012 5:50:02 AM
Jan,
Did this relocation take place recently?
Also, can you share with us who the collector is or where the machine resides now?
Probably yes.See the date when the video was uploaded on youtube.I have my info from a german forum from someone who contacted the person who shot the video.The new owner is probably the owner of a construction company.But the dozer is simply much too big for the jobs the company does.I have no info about the new location,but I will try to find out.Jan
RowanH Posted: Tuesday, May 22, 2012 7:07:37 AM
Now that's something you don't see everyday. Anyone know what engine is in it,sounds great after sitting ? Thanks for sharing.
Twin CAT 675 hp
I was also curious about the amount of work that would have been needed to get the big dinosaur up and running again. Looks and sounds to be in good running order. Also glad to see that it has been saved. I can't imagine that being anything but ridiculously expensive. Purchase (thats a lot of metal!) + maintenance + transport. It would be very interesting to know how it performed and if it will ever get to push around anymore dirt? I believe it only did the 1 job in Libya from memory?EDIT: Info here -> http://www.vincelewis.net/acco.html By the way, if you want to see all of the videos, it appears he has re-uploaded them all..Rowan.
Tarantula Posted: Tuesday, May 22, 2012 9:17:40 AM
It never got to Libya. It has never been on a job site.
//Niklas Eriksson
I would have to agree with others, it looks like it has never seen any type of work at all!!
If you notice, all the grousers are all square on the sides and look like new. If this had ever been used for pushing the grousers should be rounded over on the top corners.
Thanks for the vids guys, that is one nice machine. It will probably never be ran like it was intended. Especially with those twin engines sucking fuel like they do and the cost of fuel everywhere!!!
Dain
I'm a kid at heart, so I will play with any model construction vehicle from 1:87 scale to 1:1 scale!!!!
Age is a state of time NOT a state of mind!!
Both the grader and the dozer where part of the same order, they where going to work on a land development contract in Libya. But due to the infamous Col. Gaddafi involvement with international terrorism during this time, the United Nations endorsed large trade embargoes against Libya and the machines never got delivered. Instead they have stayed in storage in Italy and never been used to move dirt.
//Niklas Eriksson
Acco is construction company, specialized in particularly to build roads.It won big job orders and there were not enough big size machinery of the market, Acco is constructed themselves.It was enclosed in 2010.Acco is in Portogruaro, near Venice (Italy)The dozer was salvaged by oldtimer tractor collectors (Valerio brothers) some days ago.The dozer is 12 m long, 9 m high, 183 t weight; two engine (675 cv each).
RowanH Posted: Wednesday, May 23, 2012 4:35:58 AMThe dozer was salvaged by oldtimer tractor collectors (Valerio brothers) some days ago.
PORTOGRUARO. Saved from the demolition bulldozer the Acco, largest of the world. A monster d' long steel twelve meters, high 9 of the weight of 183 tons, pushed out from two motors from 675 horses l' one. Era be constructed in years Eighty for destined being in Libia but l' embargo against l' Gheddafi colonel, then accused all' age of being been involved in the international terrorism, did not concur with “ the monster ” to arrive in the Libyan desert where it would have had to operate. From then, after to be be exposed to the Samoter of Verona, it is remained confined in the shed of the Acco company to Portogruaro, without to never have been able to give demonstration of its power. After the closing of the company, it was in order to be demolished in order to gain of pieces of reciprocation. And it has been to this point that the Valerio siblings are taken part acquiring the bulldozer in order to enrich their collection of tractors d' age in the center of vivai the Bejaflor. It will be an exceptional transport, a true seen enterprise the size of means, but then it will be able to live its moments of Gloria as the extension of the tractors d' age of the Valerio, could be visited and therefore the Biggest Acco admired from gotten passionate scolaresche and.
Thanks Fabio, do you know if it will be put to work or is it purely for show?I translated the article using Babelfish and came up with this....Rowan.
janh Posted: Wednesday, May 23, 2012 7:57:46 AMSo the move was probably less than half a mile.I tried to spot the location on google street view last night.Probably the bridge in the video is the A4 motorway?Jan
Fabio Posted: Monday, July 16, 2012 10:36:46 AMSome images about transport:
DumpsterToy Posted: Monday, July 16, 2012 12:06:02 PM Rank: Advanced MemberGreat pics. THANKS for sharing
Fabio Posted: Thursday, March 21, 2013 10:43:14 AMAn video from Youtube about the Acco dozer heavy transport from the Acco depot in Portogruaro (VE) to the Bejaflor vivarium in Portogruaro.
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