Hitachi NV 45AC Technical Data And Service Manual
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Hitachi NV 45AC Technical Data And Service Manual

Hitachi NV 45AC Technical Data And Service Manual

1-3/4" coil nailer
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Download this manual See also: Operation Manual & Safety Instructions, Instruction Manual
MODEL
NV 45AC
POWER TOOLS
TECHNICAL DATA
COIL NAILER
AND
NV 45AC
SERVICE MANUAL
N
LIST No. 1098
Nov. 2000
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi NV 45AC

  • Page 1 MODEL NV 45AC POWER TOOLS TECHNICAL DATA COIL NAILER NV 45AC SERVICE MANUAL LIST No. 1098 Nov. 2000 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...

  • Page 2: Table Of Contents

    10-4. Disassembly and Reassembly of the Driving Section ..............25 10-5. Disassembly and Reassembly of the Cap and the Magazine Section ........... 29 11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ............. 32 12. STANDARD REPAIR TIME (UNIT) SCHEDULES ................ 33 [ Appendix] Assembly Diagram for NV 45AC ......................34...

  • Page 3: Product Name

    1.7 kg (3.7 lbs.). Please expand our market share with the new Model NV 45AC. The Model NV 45AC is a medium-duty roofing coil nailer capable of asphalt shingles with 25 --- 45 mm length nails after heavy-duty Model NV 45AB for 22 --- 45 mm length nails.

  • Page 4: Specifications

    5. SPECIFICATIONS 5-1. Specifications NV 45AC Model Driving system Reciprocating piston type 4.9 -- - 8.3 bar (5 -- - 8.5 kgf/cm , 70 -- - 120 psi) (Gauge pressure) Operating pressure Driving speed 3 nails/sec. Weight 1.7 kg (3.7 lbs.)

  • Page 5: Nail Selection

    5-2. Nail Selection The Model NV 45AC utilizes roofing nails which are common round-head nails collated by wire into coils from 120 nails. Applicable nail dimensions are shown below. However, it is recommended to use genuine HITACHI nails to ensure satisfactory driving quality. For nail length 22 mm (7/8"), recommend the Model NV 45AB instead of this Model NV 45AC.

  • Page 6: Nail Driving Force

    For example, when driving a nail of 3.05 mm dia. x 45 mm length (0.120" x 1-3/4") into a workpiece of hemlock with the Model NV 45AC, a pressure of about 6.9 bar (7 kgf/cm , 100 psi) allows the nailer to drive the nail flush with the wood surface.

  • Page 7: Optional Accessories

    (1) Sequential trip mechanism kit The sequential trip mechanism kit is provided as an optional accessory for the Model NV 45AC. When using this optional accessory, a nail is driven by pressing the push lever first against a workpiece and then pulling the trigger, and no nail is driven when pulling the trigger first and then pressing the push lever against a workpiece (single-shot operation).

  • Page 8: Comparisons With Similar Products

    --- 6 ---...

  • Page 9: Precautions In Sales Promotion

    7-2. Warning Label Each Model NV 45AC unit is provided with a Warning Label (illustrated below) which lists basic safety precautions in its use. Carefully ensure that customers fully understand and follow these precautions before using the tool.

  • Page 10: Related Laws And Regulations

    8. MECHANISM AND OPERATION PRINCIPLE 8-1. Mechanism As illustrated in Fig. 4, NV 45AC can be generally divided into four sections: output section, control valve section, driving section and magazine section. Most of the parts of the above sections have been newly designed, though its basic construction is the same as that of the Model NV 50AG.
  • Page 11 Valve Piston (B) [59] Plunger Spring [61] Valve Bushing (B) [55] Protector [5] Top Cover [3] Exhaust Vent Plunger (A) [62] Valve Bushing (A) [64] Head Ring [4] Head Valve (A) [12] Exhaust Body Ass'y [21] Control valve Cap [49] Cover [8] section Accumulator...

  • Page 12: Operation Principle

    8-2. Operation Principle (1) Before nailing: (Fig. 5 and Fig. 6) Exhaust Cover [8] Head valve chamber 1) When compressed air is fed to the main body, Exhaust vent it fills the accumulator ( Head Valve Air passage 2) At the same time, the compressed air flows into Spring [10] the valve piston lower chamber of the control Control valve...
  • Page 13 (3) During return: (Fig. 7 and Fig. 8) 1) When either Pushing Lever (A) [42] or Trigger Exhaust Cover [8] Head valve chamber (A) [25] is released, Plunger (A) [62] goes down Exhaust vent and the compressed air in the accumulator Head Valve (A) [12] Air passage flows into the valve piston lower chamber.

  • Page 14: Troubleshooting Guide

    9. TROUBLESHOOTING GUIDE 9-1. Troubleshooting and Correction Possible cause Problem Inspection methods Remedy : most-common cause) Check that the magazine is Use specified nails. 1) Nails cannot <Nails> correctly loaded with Remove the abnormal nails Magazine is not loaded with be driven.
  • Page 15 Possible cause Problem Inspection methods Remedy : most-common cause) Tighten screws and check Air leaks from the gap 1) Nails cannot the O-rings. between the body and the be driven. nose. Replace the O-rings. O-rings are worn or deformed. Apply grease or lubricate. O-rings need lubrication.
  • Page 16 Possible cause Problem Inspection methods Remedy : most-common cause) Remove dust and then Check that nails can be Cylinder inside surface is 1) Nails cannot lubricate. driven at 4.9 bar (5 kgf/cm abnormal (packed with dust, be driven. Replace the part. 70 psi).
  • Page 17 Possible cause Problem Inspection methods Remedy : most-common cause) Replace the part. Perform idle driving to check Driver blade is worn. 3) Nails cannot the driver blade is projected be driven into from the nose tip. the workpiece completely: Replace the abnormal part. Disassemble the output O-ring in the piston is the heads...
  • Page 18 Possible cause Problem Inspection methods Remedy : most-common cause) Replace the abnormal part. Open the nail guide and <Body: Nail feeding is 4) Nails jam. check the position of the incomplete.> (continued) feeder claw. Check that the Feeder is worn and the feeder claw holds a nail, and sliding section is abnormal.

  • Page 19: Possible Causes And Corrections Of Air Leakage

    9-2. Possible Causes and Corrections of Air Leakage Air leakage repair location 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, flaws or damage.
  • Page 20 Possible cause Air leakage points With control valve OFF With control valve ON (C) Nose (I) The O-Rings [24] [31] of the Body Ass'y [21] are abnormal (broken or damaged). The Nylock Bolt (W/Flange) M6 x 25 [35] is loose. The seal surface of the Body Ass'y [21] or the Nose [36] is abnormal (broken, deformed or scratched).

  • Page 21: Disassembly And Reassembly

    Apply grease (Nippeco SEP-3A, Code No. 930035) to the O-rings and O-rings' sliding portions. When installing the O-rings, be careful not to damage the O-rings and prevent dirt entry. Oil required: Hitachi pneumatic tool lubricant 1 oz (30 cc) Oil feeder (Code No. 877153) 4 oz (120 cc) Oil feeder (Code No.

  • Page 22: Disassembly And Reassembly Of The Output Section

    10-2. Disassembly and Reassembly of the Output Section (See Fig. 9) Hex. Socket Hd. [Tool required] Bolt M5 x 10 [1] Hex. bar wrench (4 mm) (a) Disassembly Washer [2] Remove the Hex. Socket Hd. Bolts M5 x 10 Top Cover [3] [1] with a hex.
  • Page 23 Head Valve O-Ring Apply grease to the sliding surface (A) of (I.D 16.8) [11] Concave portion of Top Cover [3] the Top Cover [3] the Exhaust Cover [8] and Head Valve (A) Groove of the [12] and charge about 0.5 g (0.018 oz) of Exhaust Cover [8] grease in the groove of the Exhaust Cover [8] (Fig.

  • Page 24: Disassembly And Reassembly Of The Control Valve Section

    10-3. Disassembly and Reassembly of the Control Valve Section (See Fig. 12) [Tools required] Retaining Ring (E-Type) for D6 Shaft [22] Flatblade head screwdriver Roll Pin Roll pin puller (3 mm (0.118 ") dia.) D3 x 18 [52] Hex. bar wrench (4 mm) Body Ass'y [21] Trigger (A) [25] Trigger Pin [54]...
  • Page 25 Pull out the Roll Pin D3 x 18 [52] with the roll pin puller (3 mm (0.118") dia.), and take out the Push control valve in the following manner. 1) Remove the Exhaust Cover [8] by following Body Ass'y [21] the procedure in (1), section 10-2.
  • Page 26 (b) Reassembly Disassembly procedures should be followed in the reverse order. Note the following points: Be extremely careful to prevent the entry of foreign particles into the control valve section. Thoroughly apply grease to the O-Ring (I.D 1.8) [63] on Plunger (A) [62], O-Rings (S-4) [58], (I.D 8.8) [57] and (I.D 11) [60] on Valve Piston (B) [59], and the shaft of Plunger (A) [62] as shown in Fig.

  • Page 27: Disassembly And Reassembly Of The Driving Section

    10-4. Disassembly and Reassembly of the Driving Section (See Fig. 17) [Tools required] Machine Screw (W/Sp. Washer) Hex. bar wrench (5 mm) M5 x 16 (Black) [44] Roll pin puller (1.5 mm (0.059"), 3 mm (0.118"), and 4 mm (0.157") dia.) Phillips screwdriver Puller for retaining ring (C-type) for hole Nylon Nut M5 [33]...
  • Page 28 [70] when reassembling (Fig. 19). Mount the Adjuster [71] and the Adjuster Knob [68] as shown in Fig. 20. Apply the supplied oil (Hitachi pneumatic tool lubricant) to Pushing Lever (B) [70] and the Bolt Washer M4 [65] before reassembly.
  • Page 29 Window of Radius portion Pushing Lever (B) [70] Mount the Adjuster Knob Dihedral width portion of the Latch [27] [68] in this orientation. Adjuster [71] Fig. 19 Fig. 20 (3) Disassembly and reassembly of the Feeder [41], Feed Piston [73], etc. (See Fig. 17) (a) Disassembly Remove the Magazine Ass'y [106] and the Guard [32] by following the procedure in (1), section 10-4.

  • Page 30: Nylock Hex. Socket Hd. Bolt M5

    Apply grease to the O-ring sliding surface of the Feed Piston [73] and Nose [36] before reassembly. Be careful not to apply too much grease to the A surface (Fig. 22). Too much grease can impair the operation of the Feed Piston [73] (at low pressure). Put the Roll Pin D4 x 14 [38] in the Feeder Arm [39] facing the split to the magazine as shown in Fig.

  • Page 31: Disassembly And Reassembly Of The Cap And The Magazine Section

    10-5. Disassembly and Reassembly of the Cap and the Magazine Section (1) Disassembly and reassembly of the Cap [49] (See Fig. 24) [Tool required] Wrench (23 mm) (a) Disassembly The Cap [49] has an M42 mm screw portion. Hold the two flat portions of the Cap [49] with a wrench (23 mm) and turn the Cap [49] to remove it.

  • Page 32: Hex. Socket Hd. Bolt M5

    (2) Disassembly and reassembly of the magazine section (See Fig. 25) [Tools required] Phillips screwdriver Flatblade screwdriver Roll pin puller (3 mm (0.118") dia.) Socket wrench (8 mm) Hex. bar wrench (4 mm) Machine Screw (W/Sp. Washer) M5 x 16 (Black) [44] Stopper Spring [92] Magazine Stopper [93] Nylon Nut M5 [33]...
  • Page 33 (a) Disassembly Remove the Machine Screw (W/Sp. Washer) M5 x 16 (Black) [44] with the Phillips screwdriver. Then the Magazine Ass'y [106] can be removed. (b) Reassembly Disassembly procedures should be followed in the reverse order. (3) Disassembly and reassembly of the Magazine Stopper [93] (See Fig. 25) (a) Disassembly Insert the tip of a flatblade screwdriver in the clearance between the Magazine [95] and the Magazine Stopper [93] and remove the Retaining Ring (E-Type) for D3 Shaft [89].

  • Page 34: Inspection And Confirmation After Reassembly

    11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY Check that Plunger (A) [62] moves smoothly. Check that there is no air leakage from each part. While driving nails with an air pressure of 4.5 kgf/cm (63 psi), check that there is no idle driving and bending of nails.

  • Page 35: Standard Repair Time (Unit) Schedules

    12. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow NV 45AC Cylinder Plate Exhaust Cover Cylinder Top Cover Piston Bumper Gasket (A) O-Ring x 2 Head Valve Spring Cylinder O-Ring Head Valve O-Ring Head Valve (A)
  • Page 36 LIST NO. 1098 PNEUMATIC TOOL PARTS LIST 2000 COIL NAILER • • ( E1 ) Model NV 45AC --- 34 ---...
  • Page 37 NV 45AC PARTS ITEM CODE NO. DESCRIPTION REMARKS USED 949-819 HEX. SOCKET HD. BOLT M5X10 (10 PCS.) 944-260 WASHER 881-841 TOP COVER 881-840 HEAD RING 883-369 PROTECTOR 883-368 HEX. SOCKET HD. BOLT M5X22 883-367 BODY GUARD 881-879 EXHAUST COVER 881-839...
  • Page 38 NV 45AC PARTS ITEM CODE NO. DESCRIPTION REMARKS USED 949-518 ROLL PIN D3X18 (10 PCS.) 949-539 ROLL PIN D3X25 (10 PCS.) 881-952 TRIGGER PIN 878-881 VALVE BUSHING (B) 878-885 O-RING (S-18) 878-925 O-RING (I.D 8.8) 981-317 O-RING (S-4) 880-672 VALVE PISTON (B) 878-887 O-RING (I.D 11)

  • Page 39: Standard Accessories

    NV 45AC PARTS ITEM CODE NO. DESCRIPTION REMARKS USED 878-163 MAGAZINE GUARD 876-465 NYLON NUT M4 945-255 U-NUT M5 883-360 MAGAZINE ASS'Y INCLUD.89-105 STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 944-459 HEX. BAR WRENCH 5MM 944-458 HEX. BAR WRENCH 4MM...

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