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Hitachi NEXT Series Instruction Manual page 84

Oil-free rotary screw air compressor
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9. MAINTENANCE [How to Service the Air Compressor]
Condensate drain port (Intercooler/Aftercooler) (Daily check)
Clean the strainer elements (Bi-Annually) & Orifices (Annually)
■ Check the condensate drain
Moisture in the intake air, especially in hot and humid environments, is condensed inside the air compressor during
compression. Daily inspect intercooler/aftercooler condensate drain to verify that there is a discharge of
compressed air (with condensate) when the air compressor is loaded. Bi-annually, clean the strainer element and
annually clean the orifice for both intercooler/aftercooler.
◆ Cleaning of strainer
[Aftercooler side]
[Intercooler side]
◆ Cleaning of orifice
■ Cleaning of strainer element
  The strainers for both the intercooler and
aftercooler shall be cleaned.
①   D ischarge the compressed air in the procedure
in 9.4
②   R emove the cover of the strainer.
③ Remove the element, wash with water and blow
④   R emove the element from inside the strainer and
wash with water.
⑤ Replace the cleaned element in its original
position and set the gasket, and plug properly.
■ Cleaning of orifice
Inspect and clean the orifices annually. Be sure to
stop the air compressor before inspecting and/or
cleaning the orifices.
■   R eplacement of the strainer and solenoid
Replace the solenoid valve and the strainer every 2
years (if operating 8000 hours/year) or 3 years (if
operating 4000 hours/ year) to new whole
assembled parts.
● Verify that discharged air with condensate
is discharged through the drain ports of
intercooler and aftercooler every 20
seconds during loading.
● If compressed air is not discharged, clean
and unclog the drain port (filter & orifice).
● Operating the air compressor without
d r a i n i n g t h e c o n d e n s a t e f ro m t h e
intercooler/afterooler, may rust the airend
internally and cause a major failure.

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