Yokogawa PT70
Yokogawa
Refurbished
The Yokogawa PT70 Autopilot Steering Stand is a marine steering-control system designed to help a vessel maintain its selected heading automatically while providing manual steering and non-follow-up (NFU) steering control options.
Installed on a ship’s bridge, the PT70 integrates autopilot controls, steering-mode selection, heading information and manual steering interfaces. Its modular system architecture separates important functions into individual units, supporting maintenance and system configuration according to the vessel’s requirements.
SM MARINE SERVICE™ supports marine equipment identification and sourcing for Yokogawa/YDK autopilot systems, including PT70 spare parts and replacement equipment, subject to identification and availability.
Manufacturer: Yokogawa / Yokogawa Denshikiki, Japan; marine navigation products are associated with YDK.
Model: PT70
Product type: Marine autopilot and steering-control stand
Equipment category: Bridge navigation and marine steering automation
Primary function: Automatic heading control with manual steering options
Typical application: Small and medium-sized vessels with compatible steering-gear arrangements
Product status: Discontinued model; replacement planning may involve the YDK PT900
Spare parts: Subject to exact part identification and availability
A marine autopilot automatically controls a vessel’s steering gear to maintain a selected heading. The PT70 combines automatic steering functions with manual steering controls so the bridge team can select the appropriate steering mode for the vessel’s operating requirements.
In automatic mode, the system uses heading information and the configured control system to command steering corrections. In hand-steering mode, the operator controls steering manually. An NFU (non-follow-up) control provides a separate method of commanding steering movement, where fitted and configured.
The complete installation is more than the visible control stand. It can include separate power and control equipment, rudder-feedback transmitters, actuators, cabling and other system-specific components.
The autopilot helps maintain a selected vessel heading by controlling the connected steering gear. Correct operation depends on the installed configuration, valid heading information and properly functioning steering-feedback equipment.
The mode selector allows the operator to choose automatic steering or hand steering. The bridge team should follow the vessel’s operating procedures when changing modes.
The non-follow-up steering control allows steering commands to be applied through the dedicated NFU arrangement. The precise operation depends on the installed system and steering-gear interface.
The control stand may include heading displays and a steering repeater compass. The supplied image shows a circular repeater-style instrument and a digital heading display. Their exact configuration should be confirmed from the vessel’s equipment documentation.
The image includes a rudder-angle indicator marked around a central zero position. Rudder-angle feedback helps the operator monitor steering response; the indicator scale shown should not be treated as a verified full system specification.
The PT70 system separates functions into different units, such as the auto-steering unit, hand-steering unit, annunciator, switch unit and power/control equipment. This architecture can assist fault isolation and maintenance.
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa / YDK |
| Model | PT70 |
| Equipment type | Marine autopilot steering stand |
| Main function | Automatic vessel heading control |
| Steering modes | AUTO, HAND and NFU functions where configured |
| Heading source | Gyrocompass or an approved alternative heading source, according to installation |
| Steering interface | Depends on the vessel’s installed steering gear and system configuration |
| System architecture | Modular control stand and associated system units |
| Replacement model | YDK PT900 is identified as the alternative model |
| Exact electrical ratings | Confirm from the installed equipment nameplates and technical documentation |
The table distinguishes general PT70 system characteristics from vessel-specific details. Do not use it as a substitute for the original wiring diagram, installation manual or approved steering-system documentation.
A PT70 installation can include the following units, depending on the original system configuration:
Control stand: The bridge-mounted operator interface.
Auto-steering unit: Processes steering-control functions for automatic heading keeping.
Hand-steering unit: Provides manual steering control.
NFU steering unit: Provides the configured non-follow-up steering interface.
Annunciator unit: Provides system indications and alarms where fitted.
Switch units: Support mode selection and other steering-control functions.
Control and power supply box: Provides the relevant control and power functions for the installation.
Distribution unit: Interfaces system signals and steering-control arrangements as designed.
μ transmitter / rudder-feedback unit: Supplies feedback information used by the steering-control system.
Actuator: Interfaces with the steering gear according to the vessel’s configuration.
Cables and connectors: Carry power and signals between the system units.
Component model numbers and part numbers must be checked against the equipment labels and the vessel’s documentation before purchasing replacement parts.
The Yokogawa PT70 is intended for marine heading and steering control. Depending on the original installation, it may be found on:
Commercial vessels
Cargo ships
Small and medium-sized merchant vessels
Vessels with compatible solenoid-valve steering arrangements
Ships requiring automatic heading control and manual steering alternatives
Suitability depends on the vessel’s steering gear, control interfaces, heading sensors, system configuration and applicable approval requirements. Do not assume every PT70 installation is interchangeable with another vessel’s system.
The following are general inspection areas for an older marine autopilot installation. They are not confirmed faults in the photographed unit, and no PT70-specific alarm code is inferred here.
Possible inspection areas include the control-power supply, protective devices, terminals, connectors and wiring. Electrical checks should be performed by qualified personnel using the vessel’s approved procedures.
Check the configured heading source, signal connections, sensor status and relevant system indications. Confirm that the displayed heading is consistent with the approved reference instruments before returning automatic steering to service.
Potential inspection areas include heading input, steering-control settings, rudder-feedback signals, actuator operation and steering-gear response. The cause must be established through systematic testing rather than replacing parts based on symptoms alone.
Inspect the feedback transmitter and its mechanical/electrical connections according to the applicable manual. A deteriorated feedback potentiometer may affect follow-up accuracy. YDK has published maintenance guidance recommending periodic potentiometer replacement for PT500/PT70/PT900 systems, with a five-year interval stated in its notice. Confirm the applicable requirements and procedure with a qualified service engineer.
Check the selected mode, control-switch condition, system indications and relevant interfaces. Follow the ship’s approved steering-changeover and emergency-steering procedures. Do not rely on an unverified control sequence.
Loose or deteriorated connections, damaged cables, power instability, feedback issues or electronic faults may be possible causes. A qualified marine electronics engineer should inspect the system and verify the fault before a replacement is selected.
Important safety note: The ship’s steering system is safety-critical. If autopilot operation is unreliable, follow the vessel’s approved procedures, use the appropriate alternative steering method and notify the responsible officer. Troubleshooting should not compromise safe navigation.
Keep the control stand, switches, displays and connectors clean and in suitable operating condition.
Inspect accessible cables, terminals and connectors for corrosion, damage or loose connections.
Monitor heading and rudder-feedback performance for abnormal behaviour.
Follow the maker’s maintenance instructions for feedback transmitters, potentiometers and actuators.
Record faults, inspections, replaced components and relevant part numbers.
Keep the original wiring diagrams and system configuration records available.
Confirm that any replacement component matches the installed model, revision and system configuration.
Arrange maintenance and commissioning through suitably qualified personnel.
Because the PT70 is a discontinued model, sourcing the correct component requires careful identification. A part that looks similar or performs a similar function may not be electrically or mechanically interchangeable.
SM MARINE SERVICE™ can assist with sourcing inquiries for the following items, subject to stock and verification:
Complete Yokogawa PT70 autopilot system or control stand
Auto-steering control unit
Hand-steering unit
NFU steering unit
Annunciator and switch units
Control and power supply box
Distribution unit
μ transmitter and rudder-feedback components
Actuator-related components
PCB/PWB assemblies and electronic modules
Rotary encoders and potentiometers
Cables, connectors and other associated parts
Available conditions may include: New, used, refurbished, reconditioned or tested working equipment, depending on actual availability. Condition, test status, warranty and delivery terms should be confirmed in the quotation.
To help identify the correct item, please provide:
A clear photograph of the equipment nameplate.
The exact model and part number printed on the unit.
Clear photographs of the front, rear and connectors, where accessible.
The component designation and PCB/PWB number, if applicable.
A brief description of the fault or replacement requirement.
The required quantity and destination country.
These details help reduce the risk of ordering an incompatible component.
YDK identifies the PT900 as an alternative to the discontinued PT70. However, a replacement is not necessarily a direct plug-and-play exchange.
Before planning a conversion, the vessel’s technical team should confirm steering-gear compatibility, control interfaces, heading-source arrangements, feedback equipment, cabling, installation requirements and applicable approvals. The complete PT900 configuration should be selected for the vessel rather than assuming that PT70 components can be reused without modification.
SM MARINE SERVICE™ can assist with identification and sourcing inquiries for PT70 and PT900 equipment and associated spare parts, subject to availability and technical verification.
The Yokogawa PT70 is a marine autopilot system designed to support automatic heading control and associated manual steering functions on a vessel’s bridge.
The PT70 is associated with Yokogawa’s marine navigation equipment business, now associated with YDK Technologies / Yokogawa Denshikiki in Japan.
The PT70 is a discontinued model. Availability of unused stock, used units and replacement parts depends on current supply conditions.
YDK identifies the PT900 as the alternative model. Compatibility and conversion requirements should be confirmed for the specific vessel before replacement.
Availability depends on the component, part number, condition and stock status. Send the equipment nameplate and clear component photographs to help identify the required item.
SM MARINE SERVICE™ can check sourcing options for used, refurbished, reconditioned or tested equipment, subject to actual availability and confirmation of condition.
Possible inspection areas include heading inputs, feedback transmitters, potentiometers, wiring, control power and actuator or steering-gear interfaces. The actual cause should be diagnosed by qualified personnel using the relevant technical documentation.
Consult the vessel’s original documentation and contact the manufacturer’s service network or a qualified marine service provider. No unverified manual download is specified in this article.
SM MARINE SERVICE™ accepts marine equipment and spare-parts sourcing inquiries from international customers. Availability, condition, technical compatibility and shipping arrangements are confirmed individually.
Yokogawa PT70 Autopilot Steering Stand is a marine bridge steering-control system designed for automatic heading keeping and associated hand and NFU steering functions, depending on the installed configuration. The PT70 is discontinued, with YDK PT900 identified as an alternative model. Contact SM MARINE SERVICE™ for PT70 autopilot spare-parts identification, replacement equipment sourcing and worldwide supply inquiries.
For the correct PT70 operator manual, installation instructions, service information, wiring diagrams and parts documentation, use the vessel’s original technical records or request documentation guidance from an authorised or qualified marine service channel.
Before ordering a replacement unit or component, confirm the exact model, part number, revision and installed system configuration. Do not use an unverified wiring diagram or assume PT70 and PT900 components are interchangeable.
SM MARINE SERVICE™ supports marine automation, navigation and communication equipment sourcing for shipowners, ship managers, technical superintendents, marine engineers and international spare-parts buyers.
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
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Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
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