Hydraulic Power Unit – 400 HP HPU
Key Features / Advantages
- Tier 4 400 HP Engine – Delivers reliable hydraulic power output for dredging and industrial machinery.
- Open-Loop Hydraulic System – Provides efficient, continuous flow for pump and cutter circuits.
- Dual Piston Pump Circuits – 80 GPM @ 5000 psi for dredge pump and 25 GPM @ 4500 psi for cutterhead.
- High-Pressure Filtration – Extends system life by removing contaminants.
- Remote Operation – Safe and efficient remote monitoring and control.
- Automatic Pressure & Flow Shutoffs – Prevents component damage during overloads.
- Hydraulic Cooling System – Maintains optimal run-time under extreme temperatures.
- Compact, Rugged Design – Built for mobility with quick-disconnect hydraulic connections.
- Eco-Friendly Hydraulic Oil – Compatible with Phillips Powerflow NZ oil for environmental compliance.
- Extended Operation – 150-gallon fuel tank and 120-ft hydraulic umbilical with ballistic nylon wrap.
Hydraulic Power Unit – 400 HP HPU
Technical Specifications
Performance Specifications
- Dredge Pump Circuit: Piston pump delivering up to 80 GPM at 5000 psi
- Cutterhead Circuit: Piston pump delivering up to 25 GPM at 4500 psi
- Hydraulic Cooling: Integrated cooling system for continuous duty operation
- Filtration: High-pressure filtration with contaminant removal for system protection
- Remote Operation: Control and monitoring via a remote device
Physical Specifications
- Engine: Tier 4 400 HP engine
- Fuel Tank Capacity: 150 gallons (568 L)
- Hydraulic Oil: Phillips Powerflow NZ (environmentally friendly)
- Dimensions: 12’ x 5’ x 6’ (3.66 m x 1.5 m x 1.83 m)
- Weight: 12,500 lbs (5,670 kg)
- Hydraulic Umbilical: 120-ft (36.58 m) hose with quick disconnects and ballistic nylon wrap
- Connections:
- Main Pump Pressure & Return: 1½-in quick disconnect
- Cutterhead Pressure & Return: ¾-in quick disconnect
- Case Drain: ¾-in quick disconnect
Required Equipment
- Compatible dredge pumps or cutterheads designed for hydraulic operation
- Fuel supply (diesel) for Tier 4 engine
Recommended Accessories
- Additional hose assemblies for extended deployment range
- Protective hose reels or spools for transportation and management of the 120-ft umbilical
- Auxiliary hydraulic attachments for excavation or material handling equipment
Hydraulic Power Unit Comparison Table
| Specification | 125 HP HPU | 200 HP HPU | 400 HP HPU | 550 HP HPU | 700 HP HPU |
|---|---|---|---|---|---|
| Engine | Tier 4 – 125 HP | Tier 4 – 200 HP | Tier 4 – 400 HP | Tier 4 – 550 HP | Tier 4 – 700 HP |
| Hydraulic System | Open-loop | Open-loop | Open-loop | Open-loop | Open-loop |
| Pump Circuit (Dredge) | Up to 140 GPM @ 5000 psi | Up to 40 GPM @ 5000 psi | Up to 80 GPM @ 5000 psi | Up to 140 GPM @ 5000 psi | Up to 160 GPM @ 5000 psi |
| Cutter Circuit | N/A | Up to 25 GPM @ 4500 psi | Up to 25 GPM @ 4500 psi | Up to 25 GPM @ 4500 psi | Up to 25 GPM @ 4500 psi |
| Filtration | High-pressure | High-pressure | High-pressure | High-pressure | High-pressure |
| Cooling System | Integrated | Integrated | Integrated | Integrated | Integrated |
| Operation | Manual | Remote | Remote | Remote | Remote |
| Fuel Tank Capacity | 120 gal (454 L) | 120 gal (454 L) | 150 gal (568 L) | 200 gal (757 L) | 120 gal (454 L) |
| Hydraulic Oil | Phillips Powerflow NZ (Eco-Friendly) | Same | Same | Same | Same |
| Umbilical Hose | 120 ft (36.58 m) with quick disconnects, ballistic nylon wrap | Same | Same | Same | Same |
| Dimensions (L x W x H) | 96” x 56” x 72” (2.44 m x 1.42 m x 1.83 m) | 13’ x 5’ x 8’ (3.96 m x 1.5 m x 2.43 m) | 12’ x 5’ x 6’ (3.66 m x 1.5 m x 1.83 m) | 13’ x 5’ x 8’ (3.96 m x 1.5 m x 2.43 m) | 13’ x 5’ x 8’ (3.96 m x 1.5 m x 2.43 m) |
| Weight | 5,500 lbs (2,495 kg) | 9,000 lbs (4,082 kg) | 12,500 lbs (5,670 kg) | 16,000 lbs (7,257 kg) | 19,500 lbs (8,845 kg) |
| Hydraulic Connections | 1” main lines, ¾” case drain | 1½” main lines, ¾” cutter & case drain | 1½” main lines, ¾” cutter & case drain | 1½” main lines, ¾” cutter & case drain | 1½” main lines, ¾” cutter & case drain |
400HP HPU Hydraulic Power Units
Industries Served
Dredging
Mining
Excavation & Construction
Marine & Offshore
Heavy Industrial Projects
Case Study
The Challenge
A coastal restoration project required continuous dredging in shallow waters where sediment composition frequently shifted between fine silt, sand, and compacted material. The fluctuating density placed high demands on hydraulic systems, and ambient coastal temperatures added stress to operating machinery. The client needed a reliable, mid-sized hydraulic power solution that could maintain consistent performance under variable load conditions while meeting strict environmental regulations.
The Solution
The 400 HP hydraulic power unit was deployed to power both dredge pumps and cutterheads simultaneously. Its dual piston pump circuits provided 80 GPM at 5000 psi for the dredge circuit and 25 GPM at 4500 psi for the cutterhead circuit, ensuring steady hydraulic flow across changing sediment loads. The integrated hydraulic cooling system prevented overheating during prolonged shifts in high ambient temperatures, while the high-pressure filtration systems safeguarded components against abrasive particles. Remote operation capability allowed operators to control performance efficiently and reduce direct exposure to hazardous working conditions.
The Result
The project achieved uninterrupted dredging operations with minimal downtime and reduced maintenance requirements. The Heavy Duty Hydraulic Power Unit 400 HP’s consistent output allowed for efficient removal of varying sediment types, accelerating progress and lowering operational costs. Compliance with environmental standards was maintained through the use of Phillips Powerflow NZ eco-friendly hydraulic oil, minimizing ecological impact. Overall, the 400 HP HPU proved to be a durable and versatile solution, balancing power, efficiency, and environmental responsibility in a demanding coastal dredging environment.
Frequently Asked Questions
What engine powers the 400 HP HPU?
The unit is powered by a Tier 4 400 HP diesel engine, designed for efficiency, lower emissions, and compliance with modern environmental standards. This makes it reliable for both regulated urban sites and remote operations.
What hydraulic performance does the 400 HP HPU deliver?
It features two piston pump circuits: a dredge pump circuit delivering up to 80 GPM at 5000 psi and a cutterhead circuit delivering up to 25 GPM at 4500 psi. This dual configuration ensures steady hydraulic power for heavy-duty dredging and excavation.
Can this hydraulic power unit 400 HP, be remotely operated?
Yes. The heavy-duty hydraulic power Unit 400 HP supports remote operation, allowing operators to monitor system performance and adjust settings from a safe distance, reducing exposure to hazardous environments.
How does the cooling system support continuous operation?
The integrated hydraulic cooling system regulates oil temperature during extended use. This ensures the 400 HP HPU can operate in high ambient heat or demanding workloads without overheating, protecting equipment and reducing downtime.
What safety features are built into the unit?
The portable hydraulic power unit 400 HP is equipped with automatic pressure and flow shutoffs triggered by integrated sensors. These safeguards prevent overload, reduce the risk of component damage, and improve operational safety during high-demand applications.
What type of fuel and oil does the system use?
It operates on diesel fuel with a 150-gallon (568 L) tank, providing long run times. For hydraulics, it uses Phillips Powerflow NZ eco-friendly oil, which minimizes environmental impact while maintaining lubrication and system efficiency.
What are the size and weight of the 400 HP HPU?
The unit measures 12’ x 5’ x 6’ (3.66 m x 1.5 m x 1.83 m) and weighs approximately 12,500 lbs (5,670 kg). Its compact footprint relative to its power output makes it versatile for deployment across dredging, mining, and construction sites.
What hydraulic connections are available?
The unit comes with 1½-in quick disconnects for the main pump pressure and return lines, and ¾-in quick disconnects for the cutterhead and case drain. These standardized connections allow quick setup, easy maintenance, and compatibility with industry equipment.
Which industries typically use the 400 HP hydraulic power system?
It is widely deployed in dredging, mining, excavation, marine, and heavy industrial sectors. Its combination of mid-range horsepower and high-pressure circuits makes it particularly effective for coastal dredging, trenching, and material handling operations.
How is the unit transported and deployed on-site?
The hydraulic power unit’s 400 HP rugged design and compact dimensions allow it to be skid-mounted or barge-deployed, depending on the project. The included 120-ft (36.58 m) hydraulic umbilical with ballistic nylon wrap provides flexibility in placement relative to the dredge or equipment being powered.
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