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2. Repair procedure
(1) Check the following parts marked with an asterisk " * " for trouble.
(2) Then check the seal parts (with the
(3) Next, check the other possible parts.
[Bold] numbers in the description below correspond to item numbers in the Parts List and exploded
assembly diagram for the Model NV 90HMC.
Air leak point
A
Exhaust
port
B
Exhaust Cover
C
Nose1
D
Nose 2
E
Feed Piston
mark) for excessive wear, flaws and breaks.
Control valve OFF
Defects on Sleeve Valve Rubber [18] (worn,
cut or flaws), or defects on seal surface of
Upper Cover [5] (damage, deformation or
flaws of
part).
Defects on O-Ring (I.D 48.5) [12], O-Ring
[16], O-Ring [20], and O-Ring [21] (worn,
cut or flaws)
Defects on seal surfaces of Exhaust Cover
[15], Sleeve Valve [19] and Cylinder [36]
(damage, deformation or flaws on (
parts)
Loose Nylock Bolt M5 x 65 [4]
Damage on Gasket (C) [17] and Packing
(B) [8]
Defects on seal surfaces of Body Ass'y
[42], Exhaust Cover [15], Plate [9] and
Upper Cover [5] (damage, deformation or
flaws)
Defects on O-Ring (S-36) [37] of Cylinder
Plate [38] (worn, cut or flaws)
Defects on O-Ring (S-32) [25] of Cylinder
[36] (worn, cut or flaws)
Defects on seal surfaces of Body Ass'y
[42] and Cylinder Plate [38] (damage,
deformation or flaws of (
Possible causes
* Defects on seal surface of Sleeve Valve
[19] (damage, deformation or flaws on the
parts)
Defects on Exhaust Rubber [22] (worn,
deformation or cut)
Defects on O-Ring (I.D 48.5) [12] (worn,
cut or flaws)
Loose Nylock High Tension Bolt M7 x 25
[56]
Defects on O-Ring (1AP-3) [106] (worn,
cut or flaws)
Defects on O-Ring (S-34) [46] of Body
Ass'y [42] (cut or flaws) and defects on its
seal part (damage, deformation or flaws on
part)
Defects
(deformation or crack damage of
parts)
Defects on Piston (H) [11] and Nose [47]
(deformation,
defects)
parts)
Defects on Feed Piston O-Ring (I.D. 14)
[108] (worn, cut or flaws) or defects on
sliding surface of Nose [47] (worn,
deformation or flaws)
Defects on O-ring (P-9) [107] of Nose [47]
(worn, cut or flaws) or defect on sliding
surface of Feed Piston [109] (worn,
deformation or flaws)
-16-
Control valve ON
on
Piston
Bumper
dust,
or
seal
surface
[45]
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