HMP-0567E Rev.7 (15/19)
Figure-4.5.1 pressurizing pattern
b) When pressurizing the hydraulic circuit, confirm that there is no noise made by entry of air.
・ If the pump is being used with a large-sized actuator, air may return to the tank via the
actuator during the trial run. If this occurs, bleed the piping and actuator of air at the
minimum allowable pressure.
・ If a large volume of air has returned to the tank, wait for the bubbles to disappear before
performing the trial run.
c) For a unit that includes a cooler, a trial run may be performed without water piping.
In this case, care should be exercised, since the fluid temperature will increase rapidly. Ensure
that the fluid temperature and viscosity during operation are within the specified ranges.
5. Maintenance and Inspection Procedures
Items for inspection, intervals between inspections and acceptance criteria are shown in
Table-5.3.1.
1) Cleaning the suction filter
Inspect the suction filter if the sound produced by pump operation has changed from that produced
when the pump was installed.
The state of filter contamination varies depending on the hydraulic system and/or the surrounding
environment, etc.
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