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 t Opening check valve (6) allows the returning oil from the
steering cylinder to ow back to the pump.
 t If the pressure at the pump suction “B” is less than the
pressure in the make-up line, oil from the make up line will
pass by the check valve (4). This prevents cavitation due to
any air that may be in the steering line.
 t When the pump stops turning all spring-loaded check
valves return to the normally closed position.
t When the motor (1) rotates (CW) the reverse movement of
the oil and valves takes place.
3.2 MOTOR
A list of features:
 t Ignition protected (UL 1500 and SAE-1171).
 t Ball bearing shaft supports both ends.
 t Extended motor shafting eliminating the pump/motor cou-
pling.
 t Machined pilot bore ensuring aligned pump/motor adapter
mounting.
t Cushioned foot mounts for quiet operation.
 t Opposite end shaft mount for tachometer/encoder.
3.3 PUMP
A list of features:
 t The reversing gear pumps (HRP’s) use gerotor style pump
unit. The gerotor gear was used because of its quiet opera-
tion and its efcient pumping capabilities.
 t The gears are driven directly from the extended motor shaft
which eliminate the need for a pump/motor shaft coupling.
 t The shaft is supported by the motor ball bearing on one
side and a hard anodized aluminum end plate on the other
side.
 t The gerotor pump is a two-piece gear assembly with an ec-
centric ring. Proper clearances and alignments are main-
tained through CNC precision machining.
t Valve block sealing is accomplished using O-ring style
seals.
p04
7


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