Hitachi NR90GC Support Question

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Question posted by hstancil on July 23rd, 2010

Gun Doesn't Always Fire On The First Trigger Poll.

Gun usually will fire on the 2nd or 3rd, but not always on the first.

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Related Hitachi NR90GC Manual Pages

Service Manual - Page 5

...Code No. 753600) Grease (Code No. 317918) 5-2. next, pull the trigger to drive the nail. Specifications (1) Gas nailer Model NR 90GC Driving system Reciprocating piston type Weight Dimensions (Length x Height ... accessories - After nailing once, nailing will not be possible again until the trigger is equipped with FULL SEQUENTIAL ACTUATION MECHANISM. Explanation of the Nailing Action To ...

Service Manual - Page 13

...energy in spark switch. The handle unit contains a trigger with a fuel cell and a battery in order to the center of the cylinder head through the spring. This spring absorbs shock to the ...This is the Hitachi's first gas strip nailer and there is a nailer that of the main parts are fed from the fuel cell to the motor. Features of a pneumatic nailer except the magazine section. ...

Service Manual - Page 14

Output section Head section (Cylinder head section) Filter [4] Cylinder Head [14] Spark Plug (A) [11] Motor Spring [12] Fan [20] Combustion chamber Chamber [24] Motor Mount [8] Top Cover [3] Motor [6] Cell Cover [109] Cell Lever [105] Switch Lever (B) [114] Cylinder Ass'y [42] Housing Ass'y [74] Piston [39] Battery [111] Piston Bumper [40] Pushing Lever [64] Trigger [98...

Service Manual - Page 15

... into the combustion chamber. Combustion chamber Fan [20] Then the nailer starts operation in the combustion chamber rotates. The Chamber Head [22] is sealed by the O-ring [36] simultaneously. Chamber...convex portion of Chamber [24] Fig. 4 Switch Plate [34] Fuel cell Trigger [98] Cell Lever [105] Chamber [24] Trigger [98] Switch Lever (B) [114] Fan switch Pushing Lever [64] --- 12...

Service Manual - Page 16

...42]. The Piston [39] is depressed. Nail Fig. 6 Switch Lever (B) [114] Switch Trigger [98] (3) During return When the Trigger [98] is depressed, the Chamber O-ring [15] Lock Bar [100] at the bottom... of fuel is partially released into the atmosphere through the Lead Valve [45]. Because combustion gas is almost completed. Chamber Lock Bar [100] Fig. 7 --- 13 --- Then the ...

Service Manual - Page 17

O-ring [15] Fan [20] Trigger [98] Pushing Lever [64] Chamber Lock Bar [100] Fig. 8 --- 14 --- When the Fan [20] ...] and [36] Combustion chamber is returned from the position under the Chamber [24] to discharge gas and cool the combustion chamber (Fig. 8). (4) Discharging and cooling When the Trigger [98] is released, the Chamber Lock Bar [100] is released. Thus the Chamber [24...

Service Manual - Page 18

...] Then the convex portion of the Lever Stopper [116] is turned on . Switch Lever (B) [114] Trigger [98] Fig. 10 (A --- Then the nailer operates only when the Trigger [98] is not turned on and nails are driven by the Trigger [98] and the end of the Chamber [24] pushes up the Tension Plate [113] and...

Service Manual - Page 19

... Handling Following table shows the problems that are apt to the nailer. Press the Pushing Lever [64] without depressing the Trigger [98], then depress the Trigger [98]. Please instruct the customers to use the nailer properly according to the uppermost position with an air gun.) Fig. 13 Filter Cover [5] No combustion occurs. No combustion occurs...

Service Manual - Page 22

...Pushing Lever [64] cannot be pushed up. The battery indicator light lights red. Keep depressing the Trigger [98] securely until the nailing operation is deformed. Mount the O-ring [15] properly. Remove the... (A) [60] and (B) [62] are out of fuel in the case of gas nailers The mechanism of a gas nailer to produce output is completely different from that the fuel cell is not set properly...

Service Manual - Page 23

Spark plug cable Controller [101]. Controller connector Fig. 16 Motor wire connector Fig. 17 --- 20 --- The wire must not be pinched when depressing the Trigger [98].

Service Manual - Page 24

... is not set properly and return completely. The Battery [111] is normal. The wire near the Trigger [98] is deformed. Clean spark plug (A) (Fig. 18). Return the Piston [39] to ...Low output. Keep depressing the Trigger [98] securely until the nailing operation is driven though nails are worn. Replace Internal Wire (A) [86]. Do not use the nailer at high speed. Mount each...

Service Manual - Page 29

... M5 x 20 [13] and remove the Cylinder Head [14] from the Housing [71]. (3) Put the Fan [20] on . Clean Spark Plug (A) [11]. 2. Check whether the trigger switch wire in the uppermost position. (Check the ... the Piston [39].) 5. If the spark plug cable is explained below. (Disassemble the nailer according to determine the cause of the Pushing Lever [64].) 4. Faulty insulation of Spark...

Service Manual - Page 33

Grease application areas Handle (B) [84] Plunger of the fan switch Plunger of the trigger switch Fig. 22 --- 30 ---

Service Manual - Page 58

... head ...following parts that the lower end of handle (A) ass'y and handle (B) ass'y. [Tools required] Hex. Place handle (B) ass'y on a workbench and put on handle ... length. Gently pull up handle (A) facing handle (B) (hooked side) downward. Overtightening the Hex. Trigger Spring [97] Trigger [98] Switch Lever (B) [114] Lever Stopper [116] Spring [129] (b) Reassembly Reassemble handle...

Service Manual - Page 60

... Side Plate [55]. (2) Disassembly and reassembly of Handle (A) [124], nail feeder and the related parts (Fig. 51) [Tools required] Phillips screwdriver Roll pin puller (4 mm (0.157")) (a) Disassembly Remove the Lever Stopper [116] from the trigger of Handle (A) [124] with a hand. Remove the Nail Rail [93] with a hand. Loosen the Tapping Screw (W/Flange...

Service Manual - Page 64

... Remove the Tapping Screw (W/Flange) D4 x 14 (Black) [95] to remove the Trigger [98]. Remove the Flat Hd. Remove the Roll Pin D2.5 x 10 [99]...95] to remove the Wiring Cover [103]. Disconnect the connector of Handle (B) [84], Controller [101] and the related parts [Tools required] Spanner Hex. Remove the Pin D2.5 [115] and Switch Lever (B) [114]. bar wrench (4 mm) Phillips screwdriver ...

Service Manual - Page 65

...] Handle (B) [84] Switch Mount [81] Switch Arm [82] Spring [129] Internal Wire (A) [86] Hook ass'y Prism [96] Nylon Nut M5 [92] Nail Rail [93] Trigger Spring [97] Trigger [98] Tapping Screw (W/Flange) D4 x 14 Roll Pin Controller (Black) D2.5 x 10 [99] [101] [95] Chamber Lock Bar [100] Tapping Screw (W/Flange) D4 x 14...

Service Manual - Page 66

Internal Wire (A) [86] Roll Pin D2.5 x 10 [99] Split Plunger Trigger [98] Fig. 55 --- 63 --- Do not damage the plunger of Internal Wire (A) [86] (Fig. 56). Do not apply tension to Handle (B) [84] then hang the ... be followed in Fig. 56. Note the following points. Be careful of the split direction of the Roll Pin D2.5 x 10 [99] when mounting the Trigger [98] and Internal Wire (A) [86].

Service Manual - Page 67

... [97] Lock Bar Spring [102] Switch Mount [81] Switch Arm [82] Trigger [98] Prism [96] Hook ass'y Hook ass'y Nylon Nut M5 [92] Do not apply tension. Tapping Screw (W/Flange) D4 x 14 (Black) [95] Hex. Bolt M5 x ... lead wire at the top. Handle (B) [84] Perform wiring so that no lead wire is placed on this rib and no pinching occurs by the Trigger [98] operation.

Service Manual - Page 72

... the Pushing Lever [64] against a workpiece. Then release the Pushing Lever [64] and depress the Trigger [98] fully to hold the Chamber [24] at the top dead center. Recheck the tightening torque ...to prevent idle driving). Check that the piston returns to the top dead center by depressing the Trigger [98]. Check that no nail is rotating). Check that the Pushing Lever [64] operates ...