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SIMRAD - PUMP-3 - THE HEART OF THE AUTOPILOT
Hydraulic systems such as the Pump-3 from Simrad are now used on all types of boats. In many respects, hydraulic steering is preferable to mechanical systems. Hydraulic systems normally consist of two components: A hydraulic pump and one or two cylinders adapted to the power of the pump.
REVERSIBLE HYDRAULIC PUMPWhichever model of pump is used (piston or centrifugal), it is installed in a closed hydraulic circuit in which pressurized oil drives the cylinder. The linear motion of the cylinder piston is transformed into circular motion by the tiller, which moves the rudder back and forth. Safety (non-return) valves are usually installed in the system to prevent any action on the rudder from affecting the hydraulic system. |
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How to choose a reversible hydraulic pump?
PUMP-2 | PUMP-3 | PUMP-4 and PUMP-5 | |
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Max. boat size | 35" / 10 meters | 50" / 15 meters | 70" / 21 meters |
Max. boat displacement | 7,5 T | 15 T | 20 T |
Recommended cylinder capacity | 80-250 CC | 160-550 CC | 290-960 CC |
Recommended ECU | AC12/NAC-2 | AC42/NAC-3 | AC42/NAC-3 |
Flow type | Moderate | Moderate | High |
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