Hitachi NV 65AF3 Technical Data And Service Manual page 26

Air leakage portion
G Control valve 2
H Cap
When the Trigger is turned off
Abnormality (wear, breakage and/or
scratches) in the O-ring (I.D 1.8) [74]
of Plunger (A) [73]
Abnormality (deformation and/or
scratches of the sliding face of
Plunger (A) [73] in Valve Bushing (A)
[75]
Abnormality (wear, breakage and/or scratches) in O-ring (I.D 37.2) [37].
Looseness of the Cap [38]
Abnormality (damage, deformation and/or scratches) in the sealed faces of the
Body [23] and the Cap [38]
--- 23 ---
Possible cause
When the Trigger is turned on
Abnormality (wear, breakage and/or
scratches) in the O-ring (S-4) [55] in
the inside of Valve Piston (B) [70]
Abnormality (deformation and/or
scratches of the sliding face of
Plunger (A) [73] in Valve Piston (B)
[70]