Furuno HRP17-12 Pumpset For Ram Sizes 14-25 cubic inches, 12V
Autopilot Pump, 12 VDC, 1.7 Cubic Inches Per Second (For Ram Sizes of 14
Cubic Inches to 23 Cubic Inches in Volume)
The PUMPHRP17-12 is a reversing pumpset designed to interface the NavPilot
series autopilot with a hydraulic steering system. The pump assembly
incorporates a reversible gerotor gear pump, a two-piece gear housed in an
eccentric ring. This allows for incredibly quiet, reliable and precise
A hydraulic steering system consists of a hydraulic actuator and one or more
steering wheel pumps, or helm pumps. As the steering wheel (helm pump) is turned
in the port direction, hydraulic oil is pumped into the port hydraulic steering
line. This oil is directed into the port side of the steering cylinder. As the
cylinder moves to port, oil from the starboard side of the cylinder returns to
the helm pump through the starboard hydraulic lines.
One end of the cylinder is fixed and the other is connected to a tiller arm,
which is connected to a rudder shaft. With this connection to the tiller arm the
linear movement of the cylinder to port is changed to rotary movement, which
turns the rudder and steers the vessel to port. Moving the steering wheel to
starboard produces the same reaction with oil being pumped out of the starboard
line and returning through the port line.
If more than one helm pump is used, a return/fill line must be installed to
connect the cases of all helm pumps together.
The output flow rate of the pumpset determines the speed of the steering
cylinder. The PUMPHRP17-12 outputs 1.6 cu. in. of oil per second and requires a
Interfacing and Installation