Operation Check Of Air Relief Valve (Bi-Annually); Cleaning Of Control Line Filter (Bi-Annually) [Fixed Speed Type] - Hitachi NEXT Series Service Manual

4.6 Operation Check of Air Relief Valve (Bi-Annually)

Relief valve ring
[Rear view]
Relief valve
Rear cover (3)
Rear cover (2)

4.7 Cleaning of Control Line Filter (Bi-Annually) [Fixed speed type]

Rear cover (1)
25
① Maintain the rated maximum discharge pressure
(ex. 100psi(0.70MPa)).
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.
WARNING
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 Discharge the compressed air in the procedure in
page 20.
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 at least every 2 years.