Hitachi NV 65HMC Service Manual And Technical Data page 20

Air leak point
F Control valve
Defect on O-Ring (P7-U) [98] of Valve
exhaust port
Piston [89] (worn, cut or flaws)
Defect on O-Ring (I.D 1.8) [92] of Plunger
[93] (worn, cut or flaws)
Defect on O-Ring (S-14) [95] of Valve
Bushing (B) [97] (worn, cut or flaws)
* Defect on inner surface of Body Ass'y [39]
valve chamber (
G Control valve
Defect on O-Ring (S-16) [96] and O-Ring
section
(S-6) [100] of Valve Bushing (A) [101]
(worn, cut or flaws)
Defect on sliding surface of Plunger [93]
O-Ring (S-6) [100] (deformation or flaws on
Valve Bushing
H
Break of Valve Packing [33]
(air duster valve
Defect on O-Ring (1AP-3) [29] (worn, cut or
section)
flaws) or defect on Valve Bushing [26] seal
surface (flaws or breaks on
Loose Valve Bushing [26] screw
I Cap
Defect on O-Ring (I.D 37.2) [59] (worn, cut
or flaws)
Loose Cap [60]
Defect on seal surfaces of Body Ass'y [39]
and Cap [60] (breaks, deformation or flaws
of
Control valve OFF
part)
part)
part)
Possible causes
Defect on O-Ring (1AP-11) [90] and O-
Ring (P9-U) [88] of Valve Piston [89]
(worn, cut or flaws)
Defect on O-Ring (S-16) [96] of Valve
Bushing (B) [97] (cut or flaws)
Defect on O-Ring (1AP-5) [99] of Valve
Bushing (A) [101] (worn, cut or flaws)
* Defect on Head Valve [10] seal surface
(breaks, deformation, flaws on
* Defect on the inner surface of Body Ass'y
[39] valve chamber (
Defect on O-Ring (S-16) [96] and O-Ring
(S-6) [100] of Valve Bushing (A) [101]
(worn, cut or flaws)
Defect on sliding surface of Plunger [93]
O-Ring (S-6) [100] (deformation or flaws on
part)
part)
-17-
Control valve ON
part)
part)