Hitachi NR90GC Service Manual - Page 24

Continued Problem Possible cause Inspection method Remedy No combustion occurs. Continued No spark occurs. (Check for sparking according to "9-3. Checking for Sparking and Corrective Action".) No nail is driven though nails are The Piston [39] does not set properly and return completely. combustion is normal. 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]. Low output. The nailer is overheated. Discharging and cooling are insufficient. The outside air temperature and the altitude are out of the specifications. Discharging and cooling are insufficient. Operating speed is fast. 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. 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 Abnormal noise is heard when the fan is rotating. * A rubbing noise may be heard in some rare cases but there is no problem in operation. Discharging and cooling are insufficient. Check that the Motor [6], Motor Mount [8], Motor Sleeve [9], Fan [20] and Nut M4 [18] are mounted properly. Mount each part properly. --- 21 ---