NABCO EAR-120 Actuator | Marine Engine Control Electric Actuator

Item Code:

Nabco EAR-120-LK01 Actuator

Brand:

NABCO (Nabtesco Corporation / Nabco Marine Systems)

Condition:

Refurbished

Manufacturer

NABCO Ltd. (Nippon Air Brake Co., Ltd.)

Country of Origin

Japan

Product Type

Electric Rotary Actuator

Marine Application

Marine Engine Control, Governor System & Automation

NABCO EAR-120 Marine Electric Rotary Actuator

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Product Introduction

The NABCO EAR-120 Actuator is a heavy-duty electric rotary actuator designed for marine engine automation and governor control applications. Manufactured by NABCO (Nippon Air Brake Co., Ltd.), Japan, it converts electrical control signals into precise rotary motion to operate engine fuel racks, governor mechanisms, dampers, valves, and other control devices.

Installed on many commercial vessels, the EAR-120 is known for its durability, precise positioning, and dependable performance in demanding marine engine-room environments.

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What Is This Equipment?

The EAR-120 receives commands from an engine governor or automation controller and accurately rotates its output shaft to the required position.

Typical functions include:

Fuel rack positioning
Engine speed regulation
Governor control
Valve and damper positioning
Remote engine control
Automation feedback control

Its high torque and accurate positioning make it suitable for continuous marine operation.

Main Features

Genuine Japanese engineering
High-torque rotary actuator
Precise position control
Rugged marine-grade construction
Long operational life
Reliable continuous-duty operation
Excellent vibration resistance
Easy installation and maintenance
Suitable for marine governor systems
High positioning accuracy

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Main Components

A typical NABCO EAR-120 actuator includes:

Electric Motor
Reduction Gearbox
Output Shaft
Position Feedback Mechanism
Limit Switch Assembly
Torque Transmission Gear
Electrical Terminal Box
Protective Housing
Mounting Bracket
Mechanical Linkage Arm

Marine Applications

The EAR-120 actuator is widely used in:

Main Engine Governor Systems
Auxiliary Diesel Engines
Remote Engine Control Systems
Fuel Injection Control
Engine Automation Systems
Boiler Damper Control
Ventilation Damper Systems
Valve Positioning Systems
Marine Power Plants
Offshore Platforms
Engine Room Automation Panels

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Common Problems & Troubleshooting

Problem	Possible Cause	Recommended Solution
Actuator does not move	Power supply failure	Check voltage and wiring
Slow movement	Gear wear or lubrication issue	Inspect gearbox and lubricate
Incorrect positioning	Feedback mechanism fault	Recalibrate or inspect position sensor
Excessive vibration	Loose mounting bolts	Tighten mounting hardware
Overheating	Continuous overload	Check actuator load and operating conditions
No response from controller	Damaged control wiring	Inspect control circuit and connectors

Maintenance Tips

For reliable long-term operation:

Inspect electrical terminals regularly.
Check mounting bolts for tightness.
Lubricate moving mechanical parts where specified.
Inspect the gearbox for wear.
Verify actuator travel during routine maintenance.
Protect the unit from excessive moisture and corrosion.
Perform functional testing during scheduled PMS inspections.

Why Ships Still Use NABCO EAR-120 Actuators

The NABCO EAR-120 continues to be used because it offers:

Proven Japanese reliability
Accurate engine control
High mechanical durability
Excellent compatibility with marine governor systems
Low maintenance requirements
Long service life
Easy replacement in existing installations
Trusted performance in commercial shipping

These qualities make it a dependable solution for engine automation and control on vessels operating worldwide.

Frequently Asked Questions (FAQ)

What is the function of the NABCO EAR-120?

It converts electrical control signals into precise rotary motion for marine engine and automation control systems.

Where is it installed?

It is commonly installed on diesel engine governor systems, fuel control mechanisms, valve actuators, and automation equipment.

Is the EAR-120 suitable for continuous operation?

Yes. It is designed for continuous-duty service in demanding marine environments.

Can the actuator be repaired?

In many cases, the motor, gearbox, bearings, seals, or electrical components can be repaired or replaced depending on the condition of the unit.

Short Product Description

The NABCO EAR-120 Electric Rotary Actuator is a robust Japanese-made actuator used in marine engine control and automation systems. Designed for accurate rotary positioning, it provides reliable operation for governor mechanisms, fuel rack control, and remote engine automation. Its rugged construction, high torque, and long service life make it a trusted choice for commercial marine applications.

SM MARINE SERVICE™

Marine Automation & Navigation Equipment Supplier

Available Condition

New Equipment
Used Equipment
Refurbished Equipment
Reconditioned Equipment

Stock Location

Bangladesh
China

Services

Worldwide Shipping
Technical Support
Spare Parts Supply
Marine Equipment Sourcing

Contact Information

SM MARINE SERVICE™
Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh

Mobile / WhatsApp / Viber: +88 01818 929292

Email: info@smmarineservice.com

Website: www.smmarineservice.com