The SERMAC 4ZR20 City-Pump is fitted with a "ZR" folding boom for ultimate versatility. With a minimum opening height of only 4.2 m and pipeline of Ø 125 mm, this pump provides the ideal solution for placing concrete in city centres or confined spaces where medium size concrete pumps would have difficulties in accessing and setting up. The 4ZR20 City-Pump is perfect for medium-small jobsites, working inside or any concrete pumping that requires a limited ground space to set-up. The 4ZR20 can easily operate in urban areas thanks to the assembly of the truck on a 2 axle wheelbase of 3,690 – 4,000 mm (Group S8) or 4,500 mm wheelbase (Group G9). The pump’s open circuit hydraulic system S8 and G9 offers reliability and high performance; from 80 m3/h to 100 m3/h concrete output at pressures of up to 85 bar.



Main features

  • Concrete pump produced, assembled and tested by SERMAC
  • Structural integrity verified with the Finite Element Method (FEM)
  • Pump frame designed for high torsion rigidity
  • Suitable for assembly on 2-axle trucks
  • Boom 4-stage, ZR-folding type
  • Pipeline diameter 125 mm (5”)
  • Main components sourced from genuine German and Italian manufacturers
  • Pumping unit with open hydraulic system and high manganese cast iron S-valve
  • Ideal for working in tight spaces
  • Total mass on ground < 16 t

Standard dotation

  • X-type front outriggers and fixed diagonal type rear outriggers
  • Straight pipes made in twin-wall with highly abrasion resistant induction hardened inner liner. Elbows made in twin-wall with chromium carbide inner liner
  • Two sets of radio remote controls provided with 2-speed proportional boom control, automatic free frequency search, 8-position joysticks and concrete output control
  • Wear compensation system between wear plate and wear ring. Wear plate and wear ring with tungsten carbide inserts
  • Automatic hopper greasing unit with manual back-up system
  • Automatic oil lubrication for piston rams
  • Safety device on hopper door and hopper grate
  • Remote controlled electric vibrator on hopper grate
  • Hydraulic powered diaphragm water pump (75 l/min, 30 bar)
  • Water tank capacity 650 l
  • Work light on hopper
  • Metal bin for accessories beside hopper
  • Warning horn on the boom
  • Accessories for cleaning and maintenance
Specifications subject to change without prior notice, no responsibility is taken for the correctness of this information.

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