Checking For Sparking And Corrective Action - Hitachi NT 65GB Technical Data And Service Manual

9-3. Checking for Sparking and Corrective Action

The following five items are the main causes of no combustion.
1. The fuel cell is abnormal. → (Replace the fuel cell with a new one.)
2. The battery is abnormal. → (Check the battery.)
3. The Chamber [16] is improperly sealed. → (Check Piston Ring (B) [17], and how much
Pushing Lever (A) [82] has been moved.)
4. The Piston [27] is not in the uppermost position. → (Check the position of the Piston [27].)
5. No sparking occurs.
It is difficult to check the cause of item 5 above ("No sparking occurs"). The following explains
how to determine the cause of no sparking. (Disassemble the nailer according to Chapter 10,
"DISASSEMBLY AND REASSEMBLY.")
Remove the fuel cell, then set nails, and finally the battery.
(1) Remove the Nylock Hex. Socket Hd. Bolt M4 x 12 [6], and then remove the Cylinder Head
[7A] from the Housing [30A].
(2) Put the Fan [11] on the Cylinder Head [7A] and check that the Fan [11] does not contact
nearby components.
(3) Push up Pushing Lever (A) [82] to rotate the motor.
(4) Hold down the Trigger [71].
→ If sparking does not occur from the spark plug (Fig. 18) as a result of the operation above,
check and take corrective action as follows:
(Disassemble and reassemble the nailer according to Chapter 10, "DISASSEMBLY AND
REASSEMBLY.")
Checking and corrective action
1. Check for stains on Spark Plug (A) [5]. → Clean Spark Plug (A) [5].
2. Faulty insulation of the spark plug cable (Sparking occurs from the spark plug cable.) →
Disconnect the spark plug cable from Spark Plug (A) [5] and check the spark plug cable. If the
spark plug cable is abnormal (discharged from the cable due to scratches), replace the
Controller [95].
3. Faulty insulation of Spark Plug (A) [5] → Replace Spark Plug (A) [5].
4. Check whether the trigger switch wire in the handle section is pinched.
5. Pushing Lever Arm [77] is faulty. → Replace Pushing Lever Arm [77].
6. The Trigger [71] is faulty. → Replace the Trigger [71].
7. No sparking occurs even if the switch in the handle section is directly turned on. → Replace
Internal Wire (A) [60A].
Cylinder Head [7A]
Spark Plug (A) [5]
Fig. 18
-23-
Check whether sparking
occurs in this area.