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The HRP (Hydraulic Reversing Pumpset) operates as follows:
As the motor (1) rotates CCW, oil from the gear pump (2) is
pumped towards output “A”. This oil passes through the check
valve (5) and goes to the line output (7). The oil pushes the cyl-
inder in the port direction. The pressure at output “A” ensures
the check valve (3) stays closed and manually opens check
valve (6). Opening check valve (6) allows the returning oil from
the steering cylinder to ow back to the pump. If the pressure
at the pump suction “B” is less than the weight of the oil in the
reservoir (8) then the oil in the reservoir will pass by the check
valve (4). This prevents cavitation due to any air that may be
in the steering line. When the pump stops turning all spring-
loaded check valves return to the normally closed position.
When the motor (1) rotates (CW) the reverse movement of the
oil and valves takes place.
3.2 PUMP UNIT (HRP17)
The electric motor has the following features:
t Ignition protected (UL 1500 and SAE-1171)
t Ball bearing shaft supports both ends
t Cushioned foot mounts for quiet operation
t Opposite end shaft mount for tachometer/encoder
The valve block is an aluminum block, precision machined to
house the valves, direct the oil and serve as the endplate for
the gear pump. The output check valves are part of what is
called a lockvalve assembly.
The lockvalve assembly consists of two output check valves
and a lockvalve spool. In the non-running position the spring
operated check valves remain closed, isolating the pump from
the steering system. The spring action of the check valves
holds the lockvalve spool in the mid-closed position.
3.3 RESERVOIR/BYPASS ASSEMBLY
The reservoir unit is machined out of solid aluminum and pro-
vides approximately 11.5 cu in of oil for oil make-up. The so-
lenoid bypass valve is located in the same aluminum housing.
It is a normally open valve and switches to the closed position
when energized by the autopilot. The valve returns to the nor-
mally open position when the autopilot is switched into the
standby mode or if there was a loss of power to the autopilot.
p04
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