Hitachi NEXT Series Instruction Manual page 96

Oil-free rotary screw air compressor
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9. MAINTENANCE [How to Service the Air Compressor]
Operation Check of Air Relief Valve (Bi-Annually)
[Rear view]
Air relief valve ring
Air relief valve
Rear cover (3)
Rear cover (2)
Cleaning of Control Line Filter (Bi-Annually) [Fixed-Speed type]
Rear cover (1)
① Maintain the rated maximum discharge pressure (ex.
100 psi (0.69 MPa).
②   P ull the ring connected to air relief valve.
③ Verify that the air relief valve operates properly and
get a hand off of the ring.
During inspection of the operation of the air
relief valve, use the appropriate facial
protection. High pressure air containing dust
particles can cause severe injury.
①   D epressurize the system described in 9.4
② Remove the front door (1).
③ Remove the control line filter element, and then use
an air nozzle to blow out the inside surface (reverse
flow action) of the control line filter element in order
to remove any dust particles.
④ Replace the element annually.

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