HMP-0567E Rev.7 (10/19)
5) Suction filter
a) Be sure to install a suction filter on the suction side of the pump.
b) Select a mesh size within the 100–200 range depending on the environment in which the unit
has been installed and its operating conditions.
c) Select a filter capacity that will be large enough to maintain proper operation in consideration of
increased fluid viscosity in the wintertime as well as the possibility of filter clogging.
6) Line filter/return filter
In general, it is not necessary to equip the pressure line/return line with a filter for the purpose of
protecting the pump. However, if the system is located in an unfavorable environment or has
servo valves, etc., installation of a line filter/return filter suited to the hydraulic system is
recommended.
7) Piping
a) Prior to installing pipes, please subject them to acid cleaning followed by neutralization.
b) The inner diameter of the suction pipe must be chosen such that the flow velocity inside the pipe
does not exceed 1.5 m/sec.
c) If the tank head pressure is not being applied to the suction part of the pump, ensure that the
direction of the suction pipe is as shown in one of the two illustrations in Figure-3.7.1. As a result,
even after the hydraulic fluid has drained out of the suction pipe, fluid will remain in the pump.
Figure-3.7.1: Suction Pipe Orientation According to the Mounting Posture of the Pump
d) Ensure that the piping does not cause excessive force to act on the pump.
e) It is recommended to equip the delivery pipe with an air vent valve.
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