Product Type

Marine Hydraulic Power Unit (HPU)

Marine Applications

• Deck Crane Hydraulic Systems
• Mooring Winch Hydraulic Systems
• Windlass Hydraulic Systems
• Hatch Cover Hydraulic Systems
• Offshore Crane Systems
• Cargo Handling Systems
• Hydraulic Steering Systems
• Marine Deck Machinery

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Introduction

The KYB Hydraulic Power Unit (HPU) is the heart of a marine hydraulic system. It generates hydraulic pressure and supplies hydraulic oil flow to various deck machinery and shipboard equipment.

KYB hydraulic power units are widely used on merchant vessels, offshore platforms, bulk carriers, container ships, tankers, and heavy-lift vessels due to their reliability, compact design, and efficient hydraulic performance.

SM MARINE SERVICE™ supplies complete KYB Hydraulic Power Units, hydraulic pumps, hydraulic motors, valves, accumulators, filters, spare parts, and overhaul services worldwide.

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What is a KYB Hydraulic Power Unit?

A Hydraulic Power Unit (HPU) is a complete hydraulic package consisting of pumps, electric motors, reservoirs, filters, control valves, and monitoring devices.

The HPU converts electrical energy into hydraulic energy and supplies pressurized oil to operate marine hydraulic equipment.

Without the hydraulic power unit, deck machinery such as cranes, winches, windlasses, and hatch covers cannot function properly.

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Main Components of a KYB Hydraulic Power Unit

Hydraulic Pumps

Generate hydraulic oil flow and pressure.

Common pump types include:

• Variable Displacement Piston Pumps
• Fixed Displacement Pumps
• Axial Piston Pumps

Electric Motor

Drives the hydraulic pump.

Oil Reservoir Tank

Stores hydraulic oil and assists cooling.

Hydraulic Filters

Remove contamination from hydraulic oil.

Pressure Relief Valves

Protect the system from overpressure.

Directional Control Valves

Control oil flow direction.

Hydraulic Accumulators

Store hydraulic energy and absorb pressure fluctuations.

Pressure Gauges and Sensors

Monitor operating conditions.

SM MARINE SERVICE™ supports complete spare parts and repair services for all major HPU components.

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Common Marine Applications

Deck Crane Hydraulic System

Provides hydraulic power for:

• Hoisting
• Luffing
• Slewing

Mooring Winch Hydraulic System

Supplies power for mooring line handling.

Windlass Hydraulic System

Operates anchor handling equipment.

Hatch Cover Hydraulic System

Controls hatch opening and closing mechanisms.

Offshore Equipment

Used in offshore cranes, winches, and lifting systems.

Steering Gear Systems

Provides hydraulic power for rudder operation.

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Operating Principle

The electric motor drives the hydraulic pump.

The pump draws hydraulic oil from the reservoir and generates pressure.

Pressurized oil flows through filters and control valves to hydraulic actuators and motors.

After completing work, oil returns to the reservoir where it is cooled and filtered before recirculation.

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Typical KYB HPU Equipment Found on Ships

Common equipment powered by KYB hydraulic power units includes:

• Deck Cranes
• Offshore Cranes
• Windlasses
• Mooring Winches
• Capstans
• Hatch Covers
• Cargo Handling Systems
• Hydraulic Cylinders
• Slewing Drives
• Hydraulic Motors

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Common Problems and Troubleshooting

Low Hydraulic Pressure

Possible causes:

• Pump wear
• Relief valve malfunction
• Internal leakage

Excessive Oil Temperature

Possible causes:

• Dirty oil cooler
• Low oil level
• Pump inefficiency

Hydraulic Oil Leakage

Possible causes:

• Damaged seals
• Loose fittings
• Hose deterioration

Excessive Noise

Possible causes:

• Air ingress
• Cavitation
• Worn bearings

Slow System Operation

Possible causes:

• Blocked filters
• Pump wear
• Valve malfunction

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Maintenance Recommendations

To maximize system reliability:

• Monitor oil cleanliness regularly
• Replace filters according to maintenance schedule
• Inspect hoses and fittings
• Check accumulator pressure
• Monitor hydraulic pump performance
• Inspect electric motor condition
• Verify pressure settings
• Perform regular oil analysis

Proper maintenance significantly increases equipment life and reduces downtime.

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Why KYB Hydraulic Power Units Are Popular

KYB HPUs remain highly respected because of:

• Japanese engineering quality
• Reliable hydraulic performance
• Long service life
• High operating efficiency
• Easy maintenance
• Excellent spare parts availability
• Proven marine application history

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Frequently Asked Questions

What does a KYB Hydraulic Power Unit do?

It generates hydraulic pressure and supplies oil flow to marine hydraulic equipment.

Can KYB HPUs be repaired?

Yes. Most components can be repaired, rebuilt, or replaced.

Are spare parts available?

Yes. Pumps, motors, valves, filters, seals, accumulators, and other parts are available.

Can complete HPU systems be supplied?

Yes. Both complete units and individual components can be supplied.

Are reconditioned units available?

Yes. SM MARINE SERVICE™ supplies both new and reconditioned equipment.

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User Manual and Technical Resources

Available documentation includes:

• User Manual
• Service Manual
• Spare Parts Catalog
• Hydraulic Circuit Diagram
• Technical Specifications
• Maintenance Procedures
• Troubleshooting Guide

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Short Product Description

The KYB Hydraulic Power Unit (HPU) is a complete hydraulic power generation system designed for marine and offshore applications. It provides reliable hydraulic pressure and oil flow for deck cranes, mooring winches, windlasses, hatch cover systems, steering gear systems, and other critical shipboard equipment. Known for durability, efficiency, and dependable performance, KYB HPUs remain a preferred solution throughout the marine industry.

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SM MARINE SERVICE™

Bangladesh Office

Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh

China Warehouse and Support Center

Shanghai, China

SM MARINE SERVICE™ supplies both New Equipment and Reconditioned Equipment depending on customer requirements and budget.

We provide worldwide supply, sourcing, repair, calibration, technical support and spare parts services for marine automation, navigation, communication and marine electronic systems.

Website : https://www.smmarineservice.com

Email : info@smmarineservice.com

WhatsApp and Viber : +8801818929292

Marketing Contact: Nazmul Hasan Bhuiyan

Mobile WhatsApp and Viber : +8801730296909

SM MARINE SERVICE™ provides worldwide sourcing, supply, repair, calibration, technical support, overhaul services, spare parts supply, and technical consultancy for KYB Hydraulic Power Units, marine hydraulic systems, deck cranes, windlasses, mooring winches, hatch cover systems, and offshore hydraulic equipment

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