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Jacon MJ4.5 Midjet Robotic Shotcrete Sprayer

The Jacon MJ4.5 Midjet is one of the most compact, self-contained shotcrete machines on the global market. Engineered for underground mining and tunneling, it delivers an impressive 26 m³/h pumping output and a 10 m vertical spray reach—rivaling much larger machines. With all-wheel skid steering, a 360° slewing boom, and radio remote control, the MJ4.5 offers unparalleled maneuverability, ease of use, and efficiency in the tightest working conditions.
Mini underground mining drill rig for mineral exploration and ore extraction.

Why choose this machine

When your worksite demands a high-performance sprayer in a compact footprint, the MJ4.5 Midjet leads the way. Its hydrostatic transmission, FOPS/ROPS-approved cabin, and multi-mode remote control system make it operator-friendly and site-compliant. Whether you’re working in narrow tunnels, restricted-access shafts, or complex underground headings, this machine provides the reach, control, and reliability you need to get the job done safely and efficiently.

Features & Benefits

High Output Shotcreting

  • 26 m³/h concrete pump

  • 300 L hopper, 21 strokes/min, 47 bar max pressure

  • Hydraulic vibrator & peristaltic chemical dosing system

Advanced Triple-Extension Boom

  • Up to 10 m vertical and 8.5 m horizontal reach

  • 360° rotation, 180° tilt, air and chemical injection at nozzle

  • Optional lancing for 11 m vertical reach

Compact & Maneuverable Chassis

  • AWD skid steering system

  • Turning radius of 5.8 m

  • Overall size: 5.4 m (L) × 2.1 m (W) × 3.2 m (H)

Full Remote Operation

  • Radio and corded remote control

  • Operates boom, chemical pump, fire suppression, and E-stop

Operator-Focused Cabin

  • FOPS/ROPS-approved open cabin

  • Reverse camera, screen, inclinometer

  • Optional: suspension seat, stereo, radio

Durable CAT Power System

  • CAT T3 94 kW engine, 2200 rpm

  • EU Stage IIIA / EPA Tier 3 emissions compliance

  • 150 L fuel tank + spark arrestor & catalytic converter

Washdown & Safety Systems

  • Optional 200 bar washdown kit

  • Fire suppression (QTEC 65 L system)

  • Boom, seatbelt, and stabilizer leg interlocks

Technical Specifications

CategorySpecification
Overall Dimensions5.4 m (L) × 2.1 m (W) × 3.2 m (H)
Wheelbase1.6 m
Outer Turning Radius5.8 m
Total WeightApprox. 7750 kg
Driver’s Cabin
FeatureSpecification
Inner Cabin Height1,425 mm
Cabin TypeOpen cabin, FOPS/ROPS approved
Safety Features2-point seatbelt, cabin door interlock, seatbelt interlock
Vision & Comfort OptionsReverse camera & screen, optional suspension seat, stereo, radio
Inclinometers2 units installed in cabin
Power System
FeatureSpecification
EngineCAT T3, 94 kW @ 2200 rpm
Emissions ComplianceEU Stage IIIA / US EPA Tier 3 Final
Exhaust SystemSpark arrestor + catalytic converter
Air CleanerDonaldson, 127 mm (~5 in)
Fuel Tank Capacity150 L
Driveline & Transmission
FeatureSpecification
Steering ModeFour-wheel skid steering
TransmissionHydrostatic, closed-loop system
Max Speed (Flat Terrain)8.5 km/h
Max Speed (10% Incline)7.9 km/h
Max Speed (20% Incline)7.3 km/h
BrakingSAHR park brake with quick-release
Tyres12 × 20 (4 + 1 spare)
Spray Boom System
FeatureSpecification
Boom TypeMaxijet with triple-extension levels
Vertical Reach9.5 m (standard), 11 m (optional with lancing)
Horizontal Reach8.5 m (standard), 10 m (optional with lancing)
Slewing Angle – Rotation360°
Slewing Angle – Tilt180°
Shotcrete Pipeline Diameter63.5 mm (2.5″), optional: 50.8 mm (2″) or 76.2 mm (3″)
Nozzle FeaturesAir & chemical injection at nozzle, blowout cap
Optional ModulesHydroscaler module (50 L/min @ 460 bar), boom with lancing
Concrete Pump & Dosing
FeatureSpecification
Hopper Volume300 L
Hopper Fill Height1028 mm
Rated Output26 m³/h @ 21 strokes/min
Pumping Cylinder (Bore × Stroke)152 mm × 1145 mm
Max Hydraulic Pressure210 bar
Max Pumping Pressure47 bar
VibratorHydraulic vibrator
Chemical Tank Capacity485 L
Chemical Pump Flow RateUp to 12 L/min, peristaltic
Optional Dosing ControlAuto chemical dosing
Electrical & Remote System
FeatureSpecification
Power SourceHardwired system
Batteries2 × 12 V, 150 Ah
Remote Control1 × radio remote, 1 × umbilical cord remote
Remote-Operated FunctionsBoom movement, chemical pump, fire suppression, emergency stop
Lights2 × strobes, 2 × working lights, 2 × tail lights, 4 × headlights
Manual OverrideFull override capability for all remote functions
Hydraulic System
FeatureSpecification
Tank Capacity265 L
Filtration10 µm return oil filtration
CoolingHydraulic oil cooler
ControlLoad-sensing boom system
Emergency Hydraulic Pump24 V emergency pump
OptionalTransfer pump
Safety Features
FeatureSpecification
Fire Suppression SystemQTEC VDAS LOP, 65 L
InterlocksStabilizer leg, cabin door, seatbelt, boom
Safety DisplaysStatus panels and warning stickers
Optional ExtinguishersDry powder ABE: 4 kg or 9 kg
Optional Systems
FeatureSpecification
Washdown System PressureMax. 200 bar
Washdown Flow RateMax. 30 L/min
Hose Reel15 m manual hose
Jet LanceIncluded
Auto Lube Kit2 L reservoir, refills every 12 hrs, 6-min cycle
Pre-Post Scanner System (PPS)100° horizontal / 135° vertical scanning angles, Class 1 IR laser
PPS RangeHorizontal: 87 mm over 10 m, Vertical: 13 mm over 10 m
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Jacon MJ4.5 Midjet Robotic Shotcrete Sprayer