4200 Gal Fire Truck
The 4200 Gallon Fire Truck is a high-capacity 8×4 firefighting vehicle engineered for large-scale urban, industrial, and remote emergency response.
Equipped with an 18,000 L (4,200 gal) water tank and a PS50 long-range fire monitor tested to deliver 60–100 m (197–328 ft) at 1 MPa, it provides exceptional reach and coverage in critical fire suppression missions.
Built on a Mercedes-Benz 8×4 vocational chassis and powered by a 426 kW diesel engine, the truck is designed in accordance with NFPA 1901 configuration and performance principles. Its robust design, extended endurance, and OEM adaptability make it ideal for fire departments, industrial safety fleets, and emergency service contractors worldwide.
The Poseidon 4200 Gallon Fire Truck represents a balanced integration of water capacity, hydraulic efficiency, and operator-centered engineering. Designed for sustained deployment in urban, industrial, and remote environments, it combines heavy-duty performance with precise fire suppression control. At the heart of the system is the PS50 fire monitor, capable of delivering both water and foam streams at a rated flow of 60–80 L/s (950–1,270 gpm) and a working pressure of 1 MPa. The monitor supports adjustable straight-stream and fog modes, allowing firefighters to transition instantly between long-range attack and wide-area coverage while minimizing direct exposure to heat and debris. For Class B applications, the truck can be equipped with integrated foam proportioning systems, either around-the-pump or balanced-pressure configurations, ensuring consistent mixing accuracy across varying flow conditions.
Water delivery is powered by a midship or PTO-driven pump designed in accordance with NFPA 1901 and NFPA 20 hydraulic guidelines. It includes pressure governors, relief valves, and stainless-steel manifolds that resist corrosion under prolonged exposure to foam concentrates and salt air. The plumbing layout features dual 65/75 mm discharges, 4–6 inch LDH intakes, and quick-connect couplings that allow seamless interface with municipal hydrants or industrial supply networks. The body structure is fabricated from high-strength carbon steel protected by an epoxy-polyurethane coating, with an optional 304/316 stainless-steel water tank for enhanced service life in coastal or chemical-exposed regions. All coatings are validated through the ISO 9227 salt-spray test, confirming their corrosion resistance under accelerated aging conditions. Reinforced chassis mounts and vibration-dampened tank supports maintain structural integrity during full-load off-road operations.
Propulsion is provided by a 15.6-liter, 426 kW (571 hp) diesel engine delivering high torque at low RPM for climbing and heavy pumping tasks. The Mercedes-Benz 8×4 drivetrain ensures balanced traction and stability, supported by 315/80R22.5 tires optimized for both paved and rugged terrains. The wheelbase configuration—1,750 + 4,600 + 1,350 mm—offers ideal weight distribution and turning geometry, maintaining control under the truck’s 37,400 kg (82,453 lb) gross vehicle weight. A dual-circuit air-brake system with ABS and ASR enhances operational safety on steep or wet surfaces, while an optional hydraulic retarder adds further braking assurance during descent.
Inside, the operator-centric cabin is designed for endurance and visibility. It accommodates two operators and four crew members, offering ergonomic seating, air-conditioning, a panoramic windshield, and adjustable mirrors that improve situational awareness in dense traffic or nighttime response. The centralized control console groups pump, lighting, and monitor controls within immediate reach, reducing operator fatigue during extended missions. The 24-volt dual-circuit electrical system, powered by alternators rated above 150 A, supports NFPA 1901-compliant lighting, warning beacons, and scene illumination packages. Integrated CAN-bus diagnostics provide continuous feedback on engine, pump, and electrical performance, simplifying preventive maintenance.
For on-scene safety, the truck includes anti-slip walkways, emergency stop controls, and reflective markings compliant with ECE R104 visibility standards, ensuring that the apparatus remains highly visible and safe to operate in low-light or high-traffic conditions. Together, these engineering elements form a cohesive firefighting platform that delivers endurance, precision, and operator confidence in every deployment scenario.
18,000 L (4,200 gal) tank for long-duration operations
PS50 fire monitor with 60–100 m range tested at 1 MPa
15.6 L, 426 kW diesel engine for high torque output
Mercedes-Benz 8×4 chassis with ABS/ASR braking
NFPA 1901/NFPA 20-aligned midship or PTO pump system
Stainless or carbon-steel construction; ISO 9227 corrosion-tested
Ergonomic six-seat cabin with air conditioning and diagnostics
Optional foam system for Class B industrial hazards
The 4200 Gallon Fire Truck is purpose-built for municipal, industrial, and remote firefighting operations where large water capacity and long-range discharge are essential.
In urban fire departments, it handles high-rise and dense-area fires where reach and sustained pressure are critical. In industrial plants, refineries, and storage depots, it provides Class A/B fire suppression through foam-compatible systems.
Its 8×4 drivetrain and high ground clearance make it equally effective in rugged or remote terrains, such as oil fields and mining sites. For municipal emergency fleets, it serves as a reliable first-response or tanker apparatus, ensuring rapid deployment and continuous operation across multiple fire zones.
| Parameter | Specification |
| Water Tank Capacity | 18,000 L (4,200 gal) |
| Dimensions (L×W×H) | 11,700 × 2,520 × 3,680 mm (460.6 × 99.2 × 144.9 in) |
| GVW | 37,400 kg (82,453 lbs) |
| Payload Capacity | 17,750 kg (39,155 lbs) |
| Engine Power | 426 kW (571 hp) |
| Engine Displacement | 15,569 ml (15.6 L) |
| Fire Monitor Model | PS50 |
| Monitor Range (tested at 1 MPa) | 60–100 m (197–328 ft) |
| Pump Type | Midship / PTO-driven, NFPA 1901-aligned |
| Flow Rate (approx.) | 60–80 L/s (950–1,270 gpm) |
| Chassis | Mercedes-Benz 8×4 |
| Brake System | Dual-circuit air brake with ABS/ASR |
| Wheelbase Set | 1,750 + 4,600 + 1,350 mm |
| Tire Size | 315/80R22.5 |
| Crew Capacity | 2 operators + 4 crew |
| Electrical System | 24 V dual circuit, ≥150 A alternator |
| Tank Material | Carbon steel / optional 304/316 stainless |
| Compliance | NFPA 1901 (design reference), NFPA 20 (pump), ISO 9227 corrosion resistance |
Designed in alignment with NFPA 1901 for fire apparatus configuration and NFPA 20 for pumping systems.
Materials tested for ISO 9227 corrosion resistance, with UL/FM component options available upon request.
Reflective visibility markings meet ECE R104 requirements.
