Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual page 24

Continued
Problem
<Electric section> Continued
No combustion
No spark occurs. (Check for
occurs.
sparking according to "9-3.
Checking for Sparking and
Corrective Action".)
<Combustion section>
No nail is driven
The Piston [39] does not
though nails are
set properly and return completely.
combustion is
normal.
Low output. Discharging and cooling are
insufficient.
The outside air temperature
and the altitude are out of the
specifications.
Discharging and cooling are
The nailer is
insufficient.
overheated.
Operating speed is fast.
Discharging and cooling are
Abnormal noise is
insufficient.
heard when the
fan is rotating.
* A rubbing noise
may be heard in
some rare cases
but there is no
problem in
operation.
Possible cause Inspection method
The Battery [111] is not set
properly.
The Battery [111] is faulty.
The battery indicator light
lights red.
Connection failure between
Internal Wire (A) [86] and the
Controller [101].
The spark plug cable is
disconnected from spark plug
(A).
Faulty insulation of the spark
plug cable wire.
Break in Internal Wire (A)
[86].
The spark switch is faulty.
Spark Plug (A) [11] is stained.
The wire near the Trigger [98]
is pinched.
Switch Lever (B) [114] is
deformed.
Check the position of the
Piston [39].
The O-rings [15] [36] are
worn.
The Lead Valve [45] is
deformed.
Inside of the cylinder is
stained.
The Piston Ring [38] is
damaged.
The Filter [4] is clogged.
Check the outside air
temperature and the altitude.
The Filter [4] is clogged.
Check that the Motor [6],
Motor Mount [8], Motor
Sleeve [9], Fan [20] and Nut
M4 [18] are mounted
properly.
--- 21 ---
Remedy
Set the Battery [111]
properly.
Replace the Battery [111].
Charge the Battery [111].
Connect properly (Fig. 16).
Connect properly (Fig. 17).
Replace the Controller
[101].
Replace Internal Wire (A)
[86].
Replace Internal Wire (A)
[86].
Clean spark plug (A)
(Fig. 18).
Position the wire correctly
(Fig. 16).
Replace Switch Lever (B)
[114].
Return the Piston [39] to the
uppermost position with a
flat-blade screwdriver.
Keep depressing the Trigger
[98] securely until the
nailing operation is
completed.
Replace the O-rings [15]
and [36].
Replace the Lead Valve
[45].
Clean the inside of the
cylinder.
Replace the Piston Ring
[38].
Clean the Filter [4] (Fig. 13).
Outside air temperature
range: 0ûC to 40ûC
Altitude: Under 1500 m
(5000 feet)
Clean the Filter [4] (Fig. 13).
Do not use the nailer at high
speed.
Speed: 1 nail/sec.
Continuous operation:
1000 nails/h
Mount each part properly.