Hitachi NV 65AF3 Technical Data And Service Manual page 25

Air leakage portion
A Exhaust port
B Exhaust cover
C Nose 1
(Feed piston passage)
D Nose 2
E Feed piston
F Control valve 1
When the Trigger is turned off
Abnormality in Head Valve (A) [12]
and Cylinder [17] [Wear and
deformation of the sealed face of the
b section]
Abnormality in O-ring (P-22) [11] or
wear, deformation and/or breakage of
Head Valve (A) [12]
Abnormality (damage) in the Exhaust
Cover [7]
Looseness of the Hex. Socket Hd.
Bolt M5 x 25 [6]
Damage of Gasket (A) [8]
Abnormality in the sealed face of the
Body [23], the Exhaust Cover [7] and
the Cylinder [17]
* Abnormality (breakage and/or
scratches) in the O-Ring (S-70) [13]
of the Cylinder Plate [14]
Abnormality in the sealing faces [the
sections c and/or d ] of the
Cylinder Plate [14], Body [23] and/or
the Cylinder [17]
Abnormality (wear, breakage and/or
scratches) in the O-ring (I.D11) [71]
of Valve Piston (B) [70]
Abnormality (wear, breakage and/or
scratches) in the O-ring (I.D 8.8) [69]
(lower side) of Valve Piston (B) [70]
Abnormality (breakage and/or
scratches) in the O-ring (S-18) [68] of
Valve Bushing (B) [67]
* Abnormality in the inner face [the
section (h)] of the valve chamber of
the Body [23]
Possible cause
When the Trigger is turned on
Abnormality in Head Valve (A) [12]
[Wear, deformation and/or breakage
of the section a ]
* Abnormality in the inner face [the
section a ] in the Exhaust Cover [7]
[Deformation and dust clogging in
the section a ]
Looseness of the Nylock High
Tension Bolt M6 x 20 [28]
Scratched and/or the broken O-ring
(P-4) [26]
Abnormality in the sealed faces of
the Body [23] and the Nose [27]
Abnormality [deformation, crack
and/or damage of the sections e
and f ] in the Piston Bumper [25]
Deformation of the Piston (H) [20]
(The deformation of driver blade
abnormality in sealed faces)
The deformation of the face f of
the Body [23]
Abnormality (wear, deformation,
breakage and/or scratches) in the
O-Ring (S-46) [15]
Abnormality (wear, breakage and/or
scratches) in the O-ring (P-21) [78] of
the Feed Piston [79], or the wear
and/or deformation of the Nose [27]
on the sliding face
Abnormality (wear, breakage and/or
scratches) in the O-ring (S-46) [15] of
the Nose [27], or wear, deformation
and/or scratches of the Feed Piston
[79] on the sliding face
Abnormality (wear, breakage and/or
scratches) in the O-ring (I.D 8.8) [69]
(upper side) of Valve Piston (B) [70]
Abnormality (breakage and/or
scratches) in the Head Valve O-ring
(I.D 16.8) [66] of Valve Bushing (B)
[67]
* Abnormality in the upper face [the
section (g)] of the valve chamber of
the Body [23]
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