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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.

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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