Hitachi NV 50AF3 Technical Data And Service Manual
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Hitachi NV 50AF3 Technical Data And Service Manual

Hitachi NV 50AF3 Technical Data And Service Manual

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MODEL
NV 50AF3
Hitachi
Power Tools
TECHNICAL DATA
COIL NAILER
AND
NV 50AF3
SERVICE MANUAL
N
LIST No.: E019
Jan. 2005
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi NV 50AF3

  • Page 1 MODEL NV 50AF3 Hitachi Power Tools TECHNICAL DATA COIL NAILER NV 50AF3 SERVICE MANUAL LIST No.: E019 Jan. 2005 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...

  • Page 2: Table Of Contents

    9-4. Disassembly and Reassembly of the Cap and the Magazine Section ........... 27 9-5. Disassembly and Reassembly of the Driving Section ..............29 10. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ........... 33 11. STANDARD REPAIR TIME (UNIT) SCHEDULES............... 34 Assembly Diagram for NV 50AF3...

  • Page 3: Product Name

    2. MARKETING OBJECTIVE The Model NV 50AF3 is a lightweight coil nailer that can handle wire-collated nails with lengths of 27 mm (1-1/16") to 50 mm (2") and sheet-collated nails with lengths of 25 mm (1") to 45 mm (1-3/4"). This model's outstanding features are as follows.

  • Page 4: Selling Point Descriptions

    3 Turn the nail holder clockwise until a click is heard (about 90 ). Nail holder (2) Nailing depth adjustment mechanism The Model NV 50AF3 is equipped with a nailing depth adjustment mechanism that enables adjustment of nailing depth by turning the adjuster dial. Nail head is...

  • Page 5: Specifications

    5. SPECIFICATIONS 5-1. Specifications Model NV50AF3 Reciprocating piston type Driving system Applicable pressure 4.9 --- 8.3 bar (5 --- 8.5 kgf/cm , 70 --- 120 psi) (Gauge pressure) Driving speed 3 pcs./sec Product weight 1.4 kg (3.1 lbs) Main body dimensions 252 mm x 269 mm x 112 mm (Length x Height x Width) (9-15/16"...

  • Page 6: Nail Selection

    5-2. Nail Selection The Model NV 50AF3 utilizes common round-head nails collated by wire or sheet into coils from 200 to 400 pieces. Applicable nail dimensions are shown below. However, it is recommended to use genuine HITACHI nails to ensure satisfactory driving quality.
  • Page 7 Unit: mm (inch) 27 --- 50 1.8 --- 2.3 (0.071 --- 0.091) (0.024) (0.472) (0.98) (0.866) (3.937) (2.835) (1-1/16 --- 2) Fig. 2 Dimensions of wire-collated nails 25 --- 45 1.6 --- 2.0 (1 --- 1-3/4) (0.063 --- 0.079) (3.858) (1.85) (0.177) (0.031)

  • Page 8: Nail Driving Force

    5-3. Nail Driving Force Figure 4 shows the energy required to drive a nail flush and the output energy of the NV 50AF3 nailer. When the supplied pressure is adjusted so that the output energy of the nailer equals the energy required for driving a nail, the nail can be completely driven.

  • Page 9: Optional Accessory

    Sequential fire parts set: The sequential fire parts set is provided as an optional accessory for the Model NV 50AF3. By using this optional accessory, a nail is driven by pressing the pushing lever first against a workpiece and then pulling the trigger, and no nail is driven when pulling the trigger first and then pressing the pushing lever against a workpiece (single-shot operation).

  • Page 10: Precautions In Sales Promotion

    6-1. Safety Instructions In the interest of promoting the safest and most efficient use of the Model NV 50AF3 Nailer by all of our customers, it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions, and fully understands the meaning of the precautions listed on the Warning Label attached to each tool.

  • Page 11: Related Laws And Regulations

    , 112 psi) or less.] (2) To protect the Model NV 50AF3 against rust, apply oil and perform idle driving two or three times to spread the applied oil fully inside this nailer when it is not used for a long time. Also coat the steel parts with oil.

  • Page 12: Mechanism And Operation Principle

    7. MECHANISM AND OPERATION PRINCIPLE 7-1. Mechanism Most of the parts of the Model NV 50AF3 have been newly designed, though the basic construction is the same as that of the Model NV 38AB2. Features of the main parts are described below.
  • Page 13 Valve piston (B) Plunger spring Valve Top cover bushing (B) Head ring Exhaust cover Exhaust port Muffler Valve bushing (A) Plunger (A) Head valve Control valve ass'y Protector(A) Control valve ass'y Piston (Driver blade) Body Cylinder Change knob (B) Piston bumper Trigger (A) Hook Adjuster...

  • Page 14: Operation Principle

    7-2. Operation Principle (1) Prior to nailing (See Fig. 6.) 1. When compressed air is supplied to the main body, Air passage (A) Head valve spring it fills the accumulator (see diagram). Air supply vent 2. At the same time, the compressed air flows into the Head valve Accumulator valve piston lower chamber of the control valve...
  • Page 15 (3) During nailing (II) (See Fig. 8.) 1. When the piston moves down inside the cylinder, the air below the piston flows through air passage (C) under the cylinder and is accumulated in the Cylinder return air chamber together with the compressed air Cylinder hole flowing through the cylinder hole.

  • Page 16: Troubleshooting

    Remove abnormal nails and nails not approved by nailer is normally loaded with Hitachi. nails approved by Hitachi. load the nailer with proper nails. The nailer is loaded with abnormal nails (bent nails, nail heads too large, or too small, abnormally collated nails, deformed wire).
  • Page 17 Cause Fault Inspection method Remedy (The mark * refers to main causes.) Air leaks from a gap Open the nail guide and inject Tighten screws and examine Nails fail to between the body and the air to check feeder's action. the O-rings (1AP-3).
  • Page 18 Nails not approved by Check whether or not the nail Use nails approved by Hitachi. Hitachi are used. is appropriate for metal reinforcing plates. The adjuster is incorrectly Try to drive nails with the...
  • Page 19 Nail Check whether or not nails Use the nails approved by * Nails not approved by jamming approved by Hitachi are used. Hitachi. Hitachi are used. Check nails referring to the Remove abnormal nalis and * Abnormal nails are mixed.
  • Page 20 Cause Fault Remedy Inspection method (The mark * refers to main causes.) < Body: Nail feeding is Nail incomplete. > jamming The feeder is worn, and the Open the nail guide to check Replace abnormal parts. (Continued) sliding section is abnormal. the position of the feeder Nose…Remove the foreign The nail guide face of the...

  • Page 21: Possible Causes And Corrections For Air Leakage

    8-2. Possible Causes and Corrections for Air Leakage Air leakage repairing position Repairing step (1) Check for abnormality in the parts marked *(asterisk) out of the following parts. (2) Check for wear, scratches and damage in the parts marked (circle). (3) Next, examine other portions.
  • Page 22 Cause Air leakage portion When the trigger is turned on When the trigger is turned off * Abnormality (breakage and/or Abnormality [deformation, crack (D) Nose 2 scratches) in the O-Ring (1AS-50) and/or damage of the sections (e) [16] of the Cylinder Plate [17] and (f)] in the Piston Bumper [21] Abnormality in the sealing faces [the Deformation of the Piston [15]...

  • Page 23: Disassembly And Reassembly

    Apply grease [Nippeco SEP-3A (Code No. 930035) or Multemp PS No. 2 (Code No. 939536)] to the O-rings and the O-ring sliding area. When installing the O-rings, exercise care to avoid scratches and dust. Lubricants required: Hitachi pneumatic tool lubricant 1 oz. (30 cc) Oil feeder (Code No.

  • Page 24: Disassembly And Reassembly Of The Output Section

    9-2. Disassembly and Reassembly of the Output Section (1) Disassembly and reassembly of the Exhaust Cover [8], Head Valve (A) [12], the Piston [15] and the Cylinder [20] [Tool required] 4 mm hex. bar wrench Hex. Socket Hd. Bolt M5 x 10 [1] (a) Disassembly (See Fig.
  • Page 25 Head Valve Before reassembly, apply grease to the sliding Head Valve Spring [10] O-Ring (I.D 16.8) [11] portion (A) of the Exhaust Cover [8] and Head Exhaust Groove of Valve (A) [12], lip portions (B) and (C) of Head Cover [8] the Exhaust Cover [8] Valve (A) [12], and charge about 0.5 g of grease...

  • Page 26: Disassembly And Reassembly Of The Control Valve Section

    9-3. Disassembly and Reassembly of the Control Valve Section [Tool required] Grip Tape [43] Roll pin puller (3 mm dia. and 2.5 mm dia.) Tape [44] Retaining Ring (E- Type) for Roll Pin D3 x 18 [50] D6 Shaft [23] Roll Pin D3 x 25 [51] Steel Ball D3.97 [52] Spring (C) [53]...
  • Page 27 (b) Reassembly Valve Bushing (B) [56] Proceed in reverse to the disassembly procedure, taking Hole care of the following points. Exercise enough care to keep the control valve unit away from foreign substances. Wire Apply enough lubricant to Plunger (A) [63], the O-ring Fig.
  • Page 28 (2) Winding the Grip Tape [43] and the Tape [44] The Grip Tape [43] and the Tape [44] are self-adhesive. Peel the backing sheets off the Grip Tape [43] and the Tape [44] before adhering them to the Body Ass'y [22]. First, adhere the end of the Grip Tape [43] near the roll pin hole of the Body Ass'y [22] and start to wind it around the Body Ass'y [22].

  • Page 29: Disassembly And Reassembly Of The Cap And The Magazine Section

    9-4. Disassembly and Reassembly of the Cap and the Magazine Section [Tools required] 21 mm-width wrench Phillips head screwdriver Roll pin pullers (2.5 mm dia. and 4 mm dia.) (1) Disassembly and reassembly of the cap unit (a) Disassembly The cap [46], united with the M42 screw, can be removed by gripping and turning it with a wrench. (b) Reassembly Proceed in reverse to the disassembly procedure, with lubricant applied to the O-ring (I.D 37.2) [45].
  • Page 30 (2) Disassembly and reassembly of the Magazine Ass'y [105] (a) Disassembly Loosen the Machine Screw (W/Washers) M5 x 30 [49] securing the Body Ass'y [22]. Then the Magazine Ass'y [105], the Hook [48] and Protector (B) [79] can be removed. (b) Reassembly Proceed in reverse to the disassembly procedure, fitting the convex portion of the Magazine [83] into the Nose [33].

  • Page 31: Disassembly And Reassembly Of The Driving Section

    9-5. Disassembly and Reassembly of the Driving Section Body Ass'y [22] Bolt Washer M4 [66] Adjuster Spring [67] O-Ring (S-12) [24] Roll Pin D1.6 x 12 [68] Adjuster Shaft [26] Adjuster Knob [69] Latch [27] Magazine Bushing [78] Pushing Lever Guide [28] Retaining Ring for D24 Hole [77] Spring [29] Feed Piston Cover [76]...
  • Page 32 (b) Reassembly Proceed in reverse to the disassembly procedure, taking care of the following points. Before reassembly, check that the end surface of Pushing Lever (A) [40] is fitted in the opening of the Pushing Lever Guide [28] (Fig. 23). After reassembly, check that Pushing Lever (A) [40] operates smoothly.
  • Page 33 (3) Disassembly and reassembly of the Feeder [39] and the Feed Piston [72] (a) Disassembly Remove the Magazine [83] from the Body Ass'y [22] as indicated in item 9-4-(2). Remove the Retaining Ring for D24 Hole [77] to take out the Feed Piston Cover [76], the Bumper [75] and the Spring [74].
  • Page 34 (3) Disassembly and reassembly of the Nail Guide [96] (See Fig. 28.) [Tool required] Nail Guide Shaft [31] 3 mm hex. bar wrench O-Ring (P-4) [93] Nose [33] Guide Lock [94] Spring [95] Nail Guide [96] Nail Stopper (A) [97] Spring [98] Nail Stopper (B) [99] Spring [100]...

  • Page 35: Inspection And Confirmation After Reassembly

    10. INSPECTION AND CONFIRMATION AFTER REASSEMBLY Make sure that: Plunger (A) [63] moves smoothly. Pushing Lever (A) [40] moves smoothly. Nail Stopper (A) [97] and Nail Stopper (B) [99] pushed with a finger completely return to position. There is no air leak at any part of the assembly. The main body is brought into operation by a simple pull on Trigger (A) [25] and by light pressure on Pushing Lever (A) [40].

  • Page 36: Standard Repair Time (Unit) Schedules

    11. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow NV 50AF3 Cylinder Exhaust Cover O-Ring x 3 Gasket (A) Cylinder Plate Head Valve Cylinder O-ring Spring Piston Bumper Head Valve O-Ring Head Valve (A) Piston Piston O-Ring...
  • Page 37 Hitachi Power Tools LIST NO. E019 PNEUMATIC TOOL PARTS LIST COIL NAILER 2005 • • Model NV 50AF3 (E1) 505 506 507...
  • Page 38 PARTS NV 50AF3 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 881-835 MUFFLER 881-838 PROTECTOR (A) 881-883 PROTECTOR (A) 1 FOR H/V 949-757 HEX. SOCKET HD. BOLT M5X20 (10 PCS.)
  • Page 39 PARTS NV 50AF3 ITEM CODE NO. REMARKS DESCRIPTION USED 881-827 HOOK 880-881 MACHINE SCREW (W/WASHERS) M5X30 (BLACK) 949-518 ROLL PIN D3X18 (10 PCS.) 949-539 ROLL PIN D3X25 (10 PCS.) 959-155 STEEL BALL D3.97 (10 PCS.) 982-454 SPRING (C) 880-086 CHANGE KNOB (B)

  • Page 40: Standard Accessories

    NV 50AF3 PARTS ITEM CODE NO. DESCRIPTION REMARKS USED 881-814 NAIL STOPPER (B) 880-393 SPRING 881-815 NAIL GUIDE COVER 881-816 COVER 878-337 SLEEVE (B) 880-413 NYLOCK HEX. SOCKET HD. BOLT M4X10 881-820 MAGAZINE ASS’Y 1 INCLUD. 81-90 STANDARD ACCESSORIES ITEM CODE NO.

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