MAI M400NT grouting machines

For decades now the legendary MAI 400NT has been used successfully around the world in mining, tunnel and underground construction, and also securing mountain slopes and all kinds of excavations. It provides constant mixture proportions and quality for injections, thereby ensuring the right kind of processing.


The MAI M400NT has been used successfully for years in mining, tunnel and underground construction in addition to securing mountain slopes and excavation pits all over the world. It has even been awarded a prize for innovation and research. The new water injection system, the wear-resistant MAI CODUR plastic components plus clear and simple operation ensure maximum convenience and the best quality of mixed material.The grout mixing pump developed specially for extreme stresses underground has been used successfully for decades in mining, tunnel and underground construction in addition to securing mountain slopes and excavation pits. It ensures consistent mixing ratios, constant quality of the mixed material and thus proper processing.

With MAI’s patented and proven mixing and conveying technology the compact MAI M400NT mortar-mixing pump can process all kinds of cements and anchoring mortars that are suitable for machine use.

In contrast to conventional injection pumps the MAI M400NT offers the following unbeatable features:

  • 2/3 less weight
  • greater mobility
  • continuous, non-pulsing pressure
  • improved use of material, less waste
  • fast and flexible adaptation to geologic conditions at any time


Thanks to its high quality, achieved through the most modern manufacturing methods available, and its service-friendly modular construction, the MAI M400NT stands apart with its long service life, low susceptibility to error and economy.

Listen up

The strengths of the innovative mixing and conveying technology are demonstrated best during:

  • Injection work
  • Subsequent grouting
  • Filling drilled holes
  • Backfillings


  • Operating voltage 400V/3/PE/50Hz
  • Operating pressure max. 45 bar
  • Nominal power 7.5 kW
  • Dimensions L – W- H 175 – 70 – 96 cm
  • Fusing 32 A
  • Filling height 95 cm
  • Gear motor 6 kW
  • Transport weight basic unit 113 kg
  • Delevery rate 6 bis 35 l/min
  • Drive unit 55 kg
  • Worm pump standard Mai MP 4L
  • Pump with pump flange 21 kg
  • Delivery rate standard 15 l/min
  • Water pump (optional) 0.6 kW

Operating pressure standard 40 bar Total weight 213 kg.


  1. Control automatic phase inverter overload protection with auto-reset function
  2. Hopper high-quality steel, long service life, protected against corrosion easy to clean sturdy and replaceable protective grate positioned low to ensure a clean construction site
  3. Drive S1 spur wheel back-geared motor -100% power-on time special seal to prevent gear damage easy removal Mixing chamber ented combination feeding and mixing innovative water-injection system ensures superior mixture quality improved feed screw made of wear-resistant plastic easy-to-service plastic housing. Pump outlet easy to attach and detach material flows in a straight line integrated compressed-air gauge
  4. Water system adaptable pressure reducer for a range of site conditions frost-proof: vertical position, position for self-draining
  5. Operation thanks to luminous digital display water flow can be adjusted even in total darkness


  • P/N 153758
  • Blowing device with rotating probe
  • P/N 153618
  • Silo connection hood
  1. Injection pressure switchES
  • P/N 153861
  • Injection pressure switch 0-16 bar
  • P/N 150925
  • Injection pressure switch 0-25 bar
  • P/N 153860
  • Injection pressure switch 0-40 bar
  • P/N 153910
  • Injection pressure switch 0-60 bar
  1. Mixer
  • P/N 100033
  • Universal mixer
  1. Augers
  • P/N 152662
  • MAI-Auger
  1. Worm pumps
  • P/N 150449
  • MAI Rotor MP 4 L Single
  • P/N 100570
  • MAI Stator MP 4 L
Descarca PDF
Descarca PDF
MAI M400NT grouting machines
Pompa torcretat sau injectat mortare speciale