The PB33B-4R offers the same four-section reach as the heavier PB33A-4R-II but in a markedly lighter package. It places concrete over a 32.55 m radius through four articulating R-fold arms, yet the whole machine weighs 16,000 kg — over four tonnes less than the PB33A — and its heaviest single piece is just 4,000 kg. For a project, that lighter weight has two practical payoffs: less load imposed on the floor the boom climbs, and a smaller, cheaper crane to erect and relocate it. Where weight and crane capacity are the constraint rather than raw reach, this is the four-section boom to choose.
A second difference sits at the tip: the fourth arm articulates through 200° rather than the usual 180°, so the end section folds back further and tucks the hose in close — handy for placing under slabs, behind walls and into recesses near the boom. In every other respect it is a true column-climbing boom: it climbs the building on a floor or shaft frame, rises with the structure, and distributes concrete that a separate stationary or line pump feeds up the riser. It runs on a 380V/50Hz supply through an 18.5 kW motor, is built and tested at TRUEMAX in Haining, carries ISO 9001:2015 and CE certification, and belongs to a line exported to over 120 countries.
1. Lightweight for its reach — At 16,000 kg the PB33B-4R is one of the lightest 32 m-class column-climbing booms, which reduces the load on the climbing floor and the structure carrying it.
2. 200° end-section fold — The fourth arm articulates to 200°, folding back further than a standard boom so the end hose tucks in tight to place under, behind and close to the boom.
3. Lower crane requirement — With a maximum single lifting unit of 4,000 kg, the boom can be erected and moved up by a smaller crane than heavier models of the same reach.
4. Four-section R-fold boom — Four articulating arms give a flexible fold and a 32.55 m radius, threading concrete into congested layouts and stowing compactly for climbing.
5. Self-climbing on the structure — Mounted on a floor or shaft frame, it jacks itself up its own height as the building rises — no crane lift between floors.
6. Full 360° gear slewing — Gear slewing turns the boom a complete circle, with a cushion valve smoothing start and stop.
7. Balance-arm-free, integrated base — No counterweight arm for free rotation in a tight core; pump station and control cabinet share the lower support for fast install and fewer faults.
8. Flexible control and configuration — TRUEMAX electric-proportional, radio and cable remotes on Omron / Schneider electrics; columns in 4–10 m lengths with floor or shaft climbing frames.
