Aluminium wheels, short cab, small fuel tank, aluminium air tanks, singlewalled boom pipe, 1 driveaxle (no tandem).
Take alot at the 31M pumi in Bergen, looks just stupid and no load capacity.
Or ask Vasa, he's got a 46M in Sweden wich is not much different than Norway.
Or do as they did years ago in Norway when they got 53M's road legal... take of half the boom :D

And you get 'dispensation' in Norway, Gjerde already has it on their 42M Putz, lenghtwise, don't think weight should be much of a problem.
My old 40M was 34 tonnes.

Dipstick: Food for thought. The stability of a pump is calculated and adjusted for the chassis configuration of the original mount. So If you alter the chassis and total weight of the unit it would need to be re stability tested to insure the unit is stable. Making the total unit lighter is not just a road thing it is critical for pump stability on the outriggers. Please confirm with the MFG of your pump to be sure the unit remains stable.

Sounds like an impossible task to me. If the manufacturers could do it, they would already. The closest thing might be a 46 or 52M Puts trailer unit, but it needs the tractor for counter weight. Maybe you could change the pony engine out for an electric motor and anchor the outriggers instead of relying on mass, but again, it will take an engineer to certify the reconfiguration, otherwise the risk is borne by ???? May I ask what the reason for the required light weight is?

Mission Impossible dude...

Hey Dipstick,

here is an idea that will work. Remove the #1 or A arm along with the rest of the boom at the turrent. Have it follow you to your jobsite with a semi trailor. Then reassemble it on the jobsite. Repeat as needed. LOL

If you need a lighter truck and have it stable then get with the engineers who make your favorite boom and have them customize you one with weight being the key issue.You dont need the headaches nor the responsibility that comes with making these kinds of changes for your company.

Travelteck is correct, if you start customizing the weights of of your pump you may not be in the pumping business long as you will be spending time in the courts explaining why your boom failed.(thats worst case scenario) .

Besides Norway is not that big, you could set up a 70M in your yard and reach half way across the country . LOL Just kidding :)

I think CIFA advertises that their carbotech 46m weighs the same as a 36m.  Its on 4 axles, and should certainly weight less than 32,000kg if it weights the same as a 36.  Ask Bob Miller at CIFA - he should know for sure.

in New Zealand we are only allowed 25,800kgs on an 8x4 truck. Most 36-metre pumps on a light truck are slightly over weight. We manage to get the Sermac 5-stage 37-metre just under the legal limit.

Twin wall pipe is actually lighter than single wall, that's why most "weight restricted" booms use twin wall pipe. They have the specs. for the different sizes/style pipes listed on Con Forms website. Our 40/47/58 Putz's use aluminum clamps on the boom pipe as another weight saving measure.

greegay, that is just a "advertises". The Italian manufacturers will put to you in a paper anything you want.

Dipstick like TooTall said is a Mission imposible. You need to known a simple rule: 10m of boom is c.a. 10t of CP(concrete pump) weight. If you want to buy a 42m pump, that pump really will have about 40t or more (with oil, water,1x operator,etc.). Better watch the laws in your country, surely this kind of vehicles may need special permissions. In the attached picture you may see a 10x4 truck who registered like 8x4 !!! (LOL) and have "legally" 31800Kg of weight.....