Hydraulic Power Unit – 125 HP HPU – Single Circuit
The 125 HP Hydraulic Power Unit (HPU) is a compact, high-performance power source designed for dredging, excavation, and industrial applications. Powered by a Tier 4 diesel engine, it delivers up to 140 GPM at 5000 psi through a single open-loop circuit, ensuring efficient operation of 4-inch dredge pumps and other hydraulic equipment. With integrated cooling, high-pressure filtration, and automatic safety shut-offs, this eco-friendly unit provides reliable, continuous performance in demanding field conditions.
Key Features / Advantages
- Tier 4 125 HP Engine – Provides dependable hydraulic power for small to mid-scale dredging and industrial operations.
- High Flow Output – Delivers up to 140 GPM at 5000 psi, ideal for driving 4-inch dredge pumps and other hydraulic systems.
- Single Open-Loop Hydraulic Circuit – Simplified, efficient design optimized for pump operation and easy maintenance.
- High-Pressure Filtration – Extends system life by removing contaminants and protecting critical components.
- Automatic Pressure & Flow Shut-Offs – Prevents equipment damage and ensures safe operation during pressure spikes or overloads.
- Integrated Hydraulic Cooling – Maintains optimal performance and prevents overheating during continuous-duty cycles.
- Compact & Mobile Design – Smaller footprint enables rapid deployment, transport, and setup in confined or remote job sites.
- Eco-Friendly Hydraulic Oil – Compatible with Phillips Powerflow NZ, ensuring environmental compliance without compromising performance.
- Extended Runtime Capacity – 120-gallon fuel tank supports longer operation with reduced refueling intervals.
Technical Specifications
Performance Specifications
- Dredge Pump Circuit: Piston pump delivering up to 140 GPM at 5000 psi
- Cutterhead Circuit: N/A – single-circuit system optimized for dredge pump operation
- Hydraulic Cooling: Integrated cooling system for continuous-duty operation
- Filtration: High-pressure filtration with contaminant removal for system protectio
- Operation: Manual operation with automatic pressure and flow shut-offs
Physical Specifications
- Engine: Tier 4 – 125 HP diesel engine
- Fuel Tank Capacity: 120 gallons (454 L)
- Hydraulic Oil: Phillips Powerflow NZ (environmentally friendly)
- Dimensions: 96” × 56” × 72” (2.44 m × 1.42 m × 1.83 m)
- Weight: 5,500 lbs (2,495 kg)
- Power Umbilical: 120-ft (36.58 m) hose bundle with quick disconnects and ballistic nylon wrap
Connections
- Main Pump Pressure & Return: 1-in quick disconnect
- Case Drain: ¾-in quick disconnect
Required Equipment
- Compatible dredge pumps or other hydraulic-driven equipment
- Diesel fuel supply for Tier 4 engine
Recommended Accessories
- Additional hose assemblies for extended deployment range
- Protective hose reels or spools for transport and hose management
- Auxiliary hydraulic attachments for excavation or material handling applications
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 |
Industries Served
Dredging & Sediment Removal
The 125 HP HPU is ideal for powering 4-inch dredge pumps in small to mid-scale dredging operations. It provides the reliable flow and pressure needed for canal cleaning, riverbank maintenance, marina dredging, and sediment removal from ponds, lakes, and waterways.
Environmental Remediation
Compact and mobile, this unit is well-suited for remediation projects that require precision hydraulic power in sensitive or confined environments. Its high-pressure output ensures effective removal of contaminated sediment, sludge, and debris during site cleanup and restoration.
Construction & Infrastructure
From foundation excavation and trenching to dewatering and slurry transport, the 125 HP HPU supports a wide range of hydraulic tools and pump systems used in construction projects. Its small footprint and ease of transport make it especially effective for both urban and remote job sites.
Municipal & Utility Services
The 125 HP HPU is widely used in municipal applications, including wastewater treatment plant maintenance, stormwater basin dredging, and lagoon cleanouts. Its dependable hydraulic performance allows for efficient and cost-effective maintenance of critical public infrastructure.
Mining & Quarry Operations
For light-duty hydraulic support tasks such as tailings pond cleaning, slurry transfer, or water management systems, this power unit delivers consistent performance. Its rugged design and high-flow capacity make it a reliable solution for supporting auxiliary equipment in mining and aggregate operations.
Marine & Coastal Operations
Designed to perform reliably in marine environments, the 125 HP HPU powers dredge pumps and hydraulic equipment for shoreline maintenance, dock and marina construction, and coastal erosion control. Its compact size makes it ideal for deployment on barges, pontoons, or other floating platforms.
Agriculture & Irrigation
In agricultural settings, the 125 HP HPU provides the hydraulic power needed for slurry transfer, pond dredging, and irrigation system maintenance. Its robust performance helps improve water flow efficiency and supports land reclamation and drainage projects in large-scale farming operations.
Environmental Remediation of a Contaminated Lagoon
Case Study
The Challenge
An environmental services contractor was tasked with removing heavy-metal-contaminated sludge from a shallow industrial lagoon as part of a soil and water remediation project. The site presented several challenges: access was limited due to soft ground conditions, the sediment was highly viscous, and the cleanup had to be executed without disturbing underlying soil layers to avoid further contamination spread. Larger hydraulic systems were impractical, and precision control of flow and pressure was critical to meeting regulatory standards.
The Solution
The EDDY Pump’s 125 HP Hydraulic Power Unit (HPU) was selected to power a 4-inch dredge pump system capable of delivering up to 140 GPM at 5000 psi. Its compact footprint allowed deployment in restricted areas, while the single-circuit design provided stable, controlled flow ideal for sensitive environmental operations. The integrated hydraulic cooling system ensured continuous performance during extended shifts, and the high-pressure filtration system protected components from abrasive contaminants in the sludge. Automatic pressure and flow shut-offs added a layer of safety during variable load conditions.
The Result
The remediation team successfully removed over 3,000 cubic yards of contaminated material without disturbing the lagoon’s substrate, meeting all environmental compliance and reporting requirements. The compact and efficient power unit enabled continuous operation with minimal downtime, shortening project duration by two weeks. The eco-friendly Phillips Powerflow NZ hydraulic oil further minimized environmental risk, and the project concluded with a restored site ready for redevelopment and future land use.
Call for sales or support
If you need assistance with pump selection, sales or engineering support, call 619-404-1916.
Talk To About Any Question?
Frequently Asked Questions
What engine powers the 125 HP Hydraulic Power Unit?
The unit is powered by a Tier 4 diesel engine rated at 125 HP, delivering reliable and efficient hydraulic power while meeting stringent emissions standards. Its compact size and fuel efficiency make it ideal for continuous use in dredging, construction, and environmental projects.
What hydraulic performance does the 125 HP HPU deliver?
This unit features a single open-loop piston pump circuit capable of delivering up to 140 GPM at 5000 psi, providing ample flow and pressure for powering 4-inch dredge pumps and other hydraulic equipment. It’s optimized for smaller-scale operations that demand consistent hydraulic performance without the complexity of dual circuits.
Is the unit compatible with existing dredge pumps and hydraulic systems?
Yes. The 125 HP HPU is designed with industry-standard hydraulic connections and pressure ratings, making it compatible with a wide range of dredge pumps, submersible units, and hydraulic-driven attachments. Quick-disconnect fittings simplify integration with existing equipment fleets.
How does the cooling and filtration system support continuous operation?
An integrated hydraulic cooling system maintains optimal oil temperature during extended operation, even in high ambient heat conditions. Combined with a high-pressure filtration system, it ensures contaminant-free hydraulic fluid circulation, significantly extending component life and reducing maintenance requirements.
What safety features are built into the 125 HP HPU?
The unit is equipped with automatic pressure and flow shut-offs triggered by onboard sensors. These features protect the system from overload, prevent component failure, and ensure safe operation under varying load conditions—critical in remote or unattended job sites.
What type of fuel and hydraulic oil does the unit use?
The HPU operates on diesel fuel with a 120-gallon (454 L) tank, providing extended runtime for long dredging or pumping shifts. It is compatible with Phillips Powerflow NZ, an environmentally friendly hydraulic oil that ensures system efficiency while minimizing ecological impact.
What are the size and weight specifications, and how does that affect deployment?
The unit measures 96” × 56” × 72” (2.44 m × 1.42 m × 1.83 m) and weighs approximately 5,500 lbs (2,495 kg). Its compact design and manageable weight make it easy to transport on standard trailers or barges, enabling rapid deployment even in space-constrained or remote locations.
What industries commonly use the 125 HP hydraulic power unit?
This HPU is widely used across various industries, including dredging, environmental remediation, construction, municipal infrastructure, mining, marine operations, and agriculture. Its balance of power, mobility, and efficiency makes it suitable for a broad range of hydraulic power applications.
Can the unit be operated remotely?
The 125 HP HPU is designed for manual operation, keeping the system simple, cost-effective, and easy to service. However, manual control still allows precise flow and pressure adjustment in the field, making it suitable for projects where remote automation is not required.
How is the unit transported and integrated on-site?
The HPU’s skid-mounted frame and compact size make it straightforward to transport via truck, trailer, or barge. Once on-site, quick-disconnect hydraulic fittings and a 120-ft (36.58 m) umbilical hose with ballistic nylon wrap enable fast integration with pumps or other hydraulic systems, reducing setup time and downtime.
HD (Heavy Duty) Slurry Pumps / Dredge Equipment
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