Hitachi NV 65AF3, Technical Data And Service Manual

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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]

Air leakage portion

  A  Exhaust port

Possible cause

When the Trigger is turned off

When the Trigger is turned on

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]

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  ]

  B  Exhaust cover

  C  Nose 1
      (Feed piston passage)

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]

  D  Nose 2

* 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 [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]

  E  Feed piston

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.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]

  F  Control valve 1

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]