Possible Causes And Corrections Of Air Leakage - Hitachi NR 90AC2 Technical Data And Service Manual

9-2. Possible Causes and Corrections of Air Leakage

Air leakage repair location
(A)
b
(B)
d
(C)
Air leakage point
Cylinder O-ring (B) [9] of the Head Valve
A) Exhaust port
[10] is abnormal or its sliding surface a is
worn, deformed or flawed.
The Head Valve Rubber [12] is abnormal or
the sealing surface b of the Cylinder [17]
is worn or flawed.
The Hex. Socket Hd. Bolt (W/Flange)
B) Exhaust cover
M6 x 35 [4] is loose.
Gasket (A) [6] is damaged.
Seal surface of the Body [22] or the
Exhaust Cover [5] is abnormal.
a
c
(D)
With control valve OFF
Repair procedure
(1) Check the points of the following parts marked by an
asterisk * for abnormal condition.
(2) Next, check the seal parts marked with a double
circle for wear, flaw and damage.
(3) And then, check other places.
(G)
Control valve section
Possible cause
With control valve ON
The Exhaust Valve Rubber [7] is abnormal
or the sliding surface c of the Head Valve
[10] is worn or flawed.
--- 16 ---
f
e