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Hydraulic Steering Systems

Standard Models of Hydraulic Rudder Control Offered

Depending upon the size of vessel, torque required for rudder-stock and angle of turning of rudder plate, we offer 5 models of Rudder Controls for In-Board vessels and 1 model for Out-Board vessels.

Bhima Hydraulic Steering Systems

This model is suitable for House Boats, Fishing Boats, Heavy Cargo Boats and Passenger Boats with Passenger capacity of 100/200, with IN-BOARD engine. Rudder Torque requirement of 1200 Mm and angular movement upto 45 degrees sides can be achieved.

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Ceto Hydraulic Steering Systems

This model is offered to medium size boats, having passenger capacity of 20/50 and with INBOARD engine. Rudder Torque requirement of 500Nm and angular movement upto 45 degrees on both sides can be achieved.

Tuna Hydraulic Steering Systems

This model is offered to small boats with IN-BOARD engine, used as Ambulance boats and Honeymoon Boats with Passenger capacity of 4 to 6. Rudder Torque requirement of 300 Nm and angular movement upto 45 degrees on both sides can be achieved.

Rapid Hydraulic Steering Systems

This model is offered to vessels with OUT-BOARD engine, and it can be directly connected between engine unit and vessel, to turn the engine to both sides. Normally used for small high speed boats to passengers.

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Hydraulic Steering Systems Jumbo

Electro Hydraulic Steering System for fishing vessels. Manual Steering Systems also offered.

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Jumbo Z
Hydraulic Steering Systems

Jumboz-500 for Fishing vessels
Jumboz-2800 for Barges
Jumboz-4000 for Heavy vessels

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Hydraulic Steering Systems Diagram
1 Steering Wheel
2 Steering Column
3 Helm Pump
4 Helm Pump Bracket
5a, 5b Thermoplastic Hose
6 Hydraulic Actuator
7 Tiller Arm
8 Rudder Plate

Manual Hydraulic System

-Schematic for Bhima, Ceto Tuna and Emergency System for Electro Hydraulic Steering.

A) Features

Approval of IRS
ISO 9001:2008 Certified Company
Facility for witnessing testing in Test Rigs in our Inspection Department at Kochi
Training facility for installation and maintenance at ourTraining Centre at Kochi
In-House Design capability for development of any type of Rudder Control System to suit specific customer requirement.
Availability of Spares and Service

B) Drive Variants

Manual Hydraulic Drive
Hydraulic Powerpack compatible to Engine Drive
Electric Motor Driven Hydraulic Powerpack

C) Models Offered

BHIMA : For House Boats, Barges, Heavy Cargo Boats and Large Passenger Boats with In-Board Engine
CETO : ForMediumsizePassengerBoatswithln-BoardEngine.
TUNA : For Ambulance Boats, Honeymoon Boats with In-Board Engine.
RAPID : For Medium and Small size boats with Out-Board Engine
JUMBO : Fishing Boats-75feet/100 feet, heavy, High Speed vessels with In-Board Engines
Jumboz-500 : For Fishing vessels
Jumboz-2800 : For Barges
Jumboz-4000 : For Heavy vessels

D) Application

Water borne vessels, big or small, need navigation control to cruise through water and to move through a controlled path. As vessels move forward by pushing the water backward, the guidance of the vessel by turning it right or left can be controlled by directing the pushed water towards respective direction.

A plate of steel, connected to a rod, which is extended to a convenient height of the boat deck, is used to deflect water to both sides, according to the requirement of turning. This plate is called RUDDER PLATE and the shaft extending to the deck, connected to the rudder plate is called RUDDER- STOCK. The boat driver will use mechanical or Hydraulic systems to turn a rod connected to the rudder-stock to do the turning job. This rod, used to turn the rudder plate is called TILLER-ARM. Though control of Tiller-Arm is easy for small boats running slow in backwaters /lakes, it requires high effort and skill to hold tiller-arm in right position in sea, as well as during fast movement in backwaters.

As the fast-moving / heavy modern vessels use an engine to run a propeller, to push water backwards, they use modern mechanisms to guide the vessel. In these vessels, angular movement of rudder-plate is precisely and efficiently controlled by Hydraulic actuators, driven by closed-loop manual/diesel-run hydraulic systems.

Based on mounting position of the engine, vessels are classified into two. In-Board Vessel, with engine mounted inside the vessel, and Out-Board vessel with engine mounted outside the vessel, preferably backside of vessel.

    Mac-N-Hom Systems, with twenty years of experience in designing and developing Hydraulic systems for various industrial applications, developed Four models of Hydraulic Steering Systems for In-Board vessels and One model Hydraulic Steering Systems for Out-Board vessels.

E) Description of Hydraulic Steering Systems

Mac-N-Hom make Hydraulic Steering Systems has four sub-sections :

1. Hydraulic Drive system

Hydraulic manual drive system a) Manual Drive System
In manual drive system, which is opted by 95% of the medium and small vessels, a steering wheel drive with a Helm Pump is provided, to supply pressurized oil to the system. By rotating a steering wheel, a driver can effortlessly pump oil required, to the Linear Actuator to turn the Tiller-Arm.

Electro/Engine drive system b) Electro/Engine Drive System
In Electro/Engine drive system, an Electric Motor driven / Engine Driven Powerpack, is providing the pressurised oil to the system. Hydraulic pump is coupled to a shaft, driven by Engine/Electric Motor.

2) Balanced Hydraulic Linear Actuator

Balanced Hydraulic Linear Actuator A Balanced Hydraulic Linear Actuator is planned, to turn the Tiller-Arm to both sides of the vessel, smoothly and precisely. Oil supply ports are provided on both sides of this actuator, through which, oil can be supplied to the piston of the actuator. As pressurised oil is supplied from the Helm Pump to the Linear Actuator, the piston-rod will move forward or backward, depending on, to which supply port, oil is provided. The Pistonrod-end / Ram-end of this actuator has a flexible connector, which can be coupled to the Tiller-Arm.

As the driver rotates the steering wheel to one side, oil filled in the circuit flows from one side of the circuit to the other side of the circuit, enabling the Pistonrod of Actuator to move from one side to the other. When the driver rotates in opposite direction, the same process will repeat resulting Pistonrod movement in the opposite direction.

3) Oil Transmission system

Oil Transmission system Thermo Plastic Hoses, as well as Zinc-coated Seamless Steel Tubes are recommended for transmission of oil from the Helm Pump to the Hydraulic Actuator.

In small boats, Thermo Plastic hoses will be sufficient. But in longer vessels, Zinc-coated Seamless Steel tubes are recommended between Thermo Plastic hoses at the Helm Pump-end and Actuator-end.

4) Oil Feeding and Priming System

Oil Feeding and Priming System To feed oil in the circuit, a Filler Breather is provided on top of a Reservoir Unit mounted on the Helm Pump. After filling oil in the Reservoir, drive-shaft of the Helm Pump is rotated in one direction by a Steering Wheel. Oil will flow to that side of the circuit and air trapped in the other side will escape through a special attachment in the Reservoir. On rotating the Steering Wheel to the other side, any air trapped in the first side will escape through the attachment. Two repeated efforts will make the full driving system ready for driving.
An Oil Level Indicator is mounted on the Reservoir Unit for monitoring quantity of oil in the circuit.

F) Technical Specification


Specification Bhima Ceto Tuna
Hydraulic Actuator Ram Size(mm) 25 20 16
Hydraulic Actuator Thrust @40kg/cm2(Kgf) 588kgf (5768 N) 376kgf (3688 N) 240kgf (2350 N)
Hydraulic Torque | 180mm (45o) 105.8kgf (1038 N) 67.7kgf (664 N) 43.2kgf (424 N)
@ Tiller arm length | 220mm (35o) 129.4kgf (1270 N) 82.7kgf (811 N) 52.8kgf (518 N)
Hydraulic Actuator Stroke 260mm 260mm 260mm
Tiller Arm Turn Upto45o both sides Upto45o both sides Upto45o both sides
Steering System Steering Wheel/Joy Stick
Number of turns Standard 4+4 2½+2½ 2+2
Optional 2+2 1½+1½ 1+1


Hydraulic Actuator Ram Size : 56mm
Hydraulic Actuator Thrust @ 50Kg/cm2 : 4,420kgf
Hydraulic Actuator Torque with Tiller Arm of 200mm : 884 Kgm (8700Nm)
Hydraulic Actuator Stroke : 300mm
Tiller arm (200mm) Turn : 45 Deg + 45 Deg
Steering Wheel Diameter : 914mm (36")
Drive : Manual / Electro Hydraulic(Optional
Oil Transmission : Zinc Coated Seamless Steel / Stainless Steel Tubes, High Pressure Thermoplastic Hoses
Hydraulic Oil : Servo 32 (IOC) / Bharath Hydro 32 (BPCL) / Encl

JUMBOZ(500, 2800, 4000)

Specification JumboZ-500 JumboZ-2800 JumboZ-4000
Hydraulic Actuator Ram Size(mm) 40X2 Nos 50X2 Nos 50X2 Nos
Hydraulic Actuator Thrust (Kgf) 1400@ 50kg/cm2 9590@ 70kg/cm2 13700@ 100kg/cm2
Hydraulic Actuator Torque with Tiller Arm of 300mm (kg.m) 500 2800 4000
Hydraulic Actuator Stroke(mm) 440 440 440
Tiller Arm Type Double Ended Double Ended Double Ended
Tiller Arm Turn Upto45o both sides Upto45o both sides Upto45o both sides
Steering System Steering Wheel Joy Stick Joy Stick
Emergency Manual Steering Built-in Optional Optional
Low Pressure Alarm Provided Provided Provided
Temperature Alarm Provided Provided Provided
Port/Starboard End Alarm Provided Provided Provided
Rudder Position Indicator Optional Provided Provided

G) Supporting Accessories

1) Hydraulic Gear Shifting System

2) Electronic Rudder Position Indicator

Electronic Rudder Position Indicator This unit will indicate the angular position of rudder plate and guide the pilot through out the travel. The rudder - stock will be mounted with a rotary encoder and the angular position of rudder plate is indicated in the display unit. References of zero position, and maximum angular positions on both sides are indicated. High quantity LED bulbs are used to indicate the rudder plate angle. For PORT side position indication, RED colour LEDs, for STAR BOARD side position indication, GREEN colour LEDs and for straight position indication, WHITE colour LEDs are used to follow the Rules governing the maritime practices.

An intensity controller for LED light is also provided to set the indicator light to suit the pilot.

H) Data to be provided by customer for selection of model:

(Refer Schematic'above' instead of on Page 1)

1) Tiller-Arm Pin to Pin Distance in mm (A) (Std: 180mm):
2) Steering Point to Actuator Distance (B) in Meters:
3)Torque on Rudder stock in Kgm or Nm:
4) Maximum Rudder Angle in Degrees:
5) Width of vessel in Meters:

I) Our Major customers include :

1) Navgathi Marine Design and Constructions P Ltd, Kochi, Dubai and Korea
2) Kerala State Inland Navigation Corporation, Kochi
3) State Water Transport Department, Kerala
4) Uno Tech Marine Engineering & Services P Ltd, Edakochi
5) Matha Marine, Nettoor, Kochi
6) Nautical Lines, Thiruvananthapuram.
7) Mega Engineering Company, Beypore Calicut.


Electronic Rudder Position Indicator Quality control system of our company demands endurance test with cyclic operations of Hydraulic Actuator at various hydraulic pressure levels. We are employing electro hydraulic system based Endurance-Test-Rig to ensure quality of balanced hydraulic actuator, that every cylinder supllied is in accordance with highest quality level for long service life. We ensure each and every element supplied to the customer exceeds the demanded service requirements of the system, The system assembled in our Assembly-Test-Rig, undergoes rigorous testing before it reaches the customer.

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