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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 65HMC.
Air leak point
A
Exhaust port
B
Exhaust cover
(near the head
guard)
C
Nose 1
D
Nose 2
E
Feed piston
mark) for excessive wear, flaws and breaks.
Control valve OFF
Defects on Head Valve [10] and Valve
Rubber [20] seal surfaces (deformation or
flaws on
seal surfaces)
Defects on Valve Rubber [20] and Cylinder
[23] seal surfaces (deformation or flaws on
seal surfaces)
Defects on Cylinder O-Ring (D) [17] and
O-Ring (1AS-50) [19] (worn, cut or flaws)
Defects on Exhaust Cover [7], Body Ass'y
[39] and Separator [18] seal surfaces
(breaks, deformation or flaws on
surfaces)
Defects on Plunger O-Ring [31] (worn, cut
or flaws) or defects on Exhaust Cover [7]
seal surface (deformation or flaws on the
seal surface)
Loose Nylock Bolt M5 x 25 [6]
Break in Gasket [14]
Defects on Body Ass'y [39] and Exhaust
Cover [7] seal surfaces (breaks,
deformation or flaws)
Defect on O-Ring (P-36) [34] of Cylinder
[23] (worn, cut or flaws)
Defect on Body Ass'y [39] seal surface
(breaks, deformation or flaws on
Possible causes
Defects on Exhaust Cover [7]
(worn, deformation or cracks)
* Defects on Exhaust Rubber [13]
(breaks, deformation or flaws)
* Defects on Head Valve [10] seal surface
(breaks, deformation or flaws on the seal
surface)
* Defects on O-Ring [11] (deformation or
flaws on
seal
Loose Nylock High Tension Bolt M6 x 20 [52]
Defect on O-Ring (1AP-3) [102]
(worn, cut or flaws)
Defect on O-Ring (S-38) [42] of Body Ass'y
[39] (cut or flaws) and seal trouble (breaks,
deformation or flaws on
Defect on Piston Bumper [41]
(deformation or cracks of
Defect on Piston (H) [16] and Nose [43]
part)
(deformation, dust or seal surface defect)
Defect on Feed Piston O-Ring [104] (worn,
cut, or flaws) or defects on sliding surface
of Nose [43] (worn, deformation or flaws)
Defect on O-Ring (P-9) [103] of Nose [43]
(worn, cut or flaws) or defect on sliding
surface of Feed Piston [105] (worn,
deformation or flaws)
-16-
Control valve ON
part)
part)
parts)
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