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Most steering manufacturers have recommended hydraulic
oils to be used in their systems. The HRP pumpsets are com-
patible with these oils. Most manufacturers use an ISO #32 or
ISO #10 type of oil.
Three hydraulic connections are required to the pumpset. Two
lines connect the pump (outputs A and B) to the main steering
(port and starboard) lines.
It is not critical to identify which of the steering lines is port
or starboard as most new autopilots will determine the pump
direction and program the drive outputs to suit. For older au-
topilots the motor leads can be reversed to change the pumps
direction. The third line, which is the interconnect or ll line,
connects the pumpset to the header tank or helm pump case.
This third line is critical, as it provides make up oil and allows
the pumpset to vent any air, which may enter the pumpset
from the steering lines. It is recommended that ex hose be
used for all three lines to prevent any pump noise from be-
ing transmitted to the steering system. The port and starboard
steering lines should have a pressure rating of 1000 psi mini-
mum; where the third ll/interconnect line is a non-pressurized
line. Shut-off or isolation valves for all three lines are recom-
mended. If the pumpset fails, the isolation valves can be shut
off and manual steering maintained.
The three hydraulic connections on the valve block are 9/16”-
18 UNF (ORB -06) threads and are tted with adapter to 1/4”
NPT (National Pipe Thread). If installers prefer the adapters
can be removed and connections can be made directly to the
valve block. When installing the hydraulic tting in the 1/4”
NPT connection a pipe thread sealant such as Teon paste or
tape must be used.
NOTE OF CAUTION:
It is important that the port or starboard
line does not become crossed with the fill/interconnect line as
this could cause high pressure to be introduced into the pumps
tank cavity. In steering systems where the fill/interconnect line
is pressurized (e.g. - Hynautics or Teleflex) the recommended
operating pressure is approximately 20 to 25 psi. The shaft seal
on the HRP pumpsets is rated at 50 psi and is well within the
pressure range of these steering systems. Over-pressurizing
these steering systems and causing a shaft seal failure will void
the warranty of the pumpset.
p06
9


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