Hitachi NR 83A2 Technical Data And Service Manual
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Hitachi NR 83A2 Technical Data And Service Manual

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MODEL
NR 83A2
Hitachi
Power Tools
TECHNICAL DATA
STRIP NAILER
AND
NR 83A2
SERVICE MANUAL
N
LIST No. E008
May 2003
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
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Summary of Contents for Hitachi NR 83A2

  • Page 1 MODEL NR 83A2 Hitachi Power Tools TECHNICAL DATA STRIP NAILER NR 83A2 SERVICE MANUAL LIST No. E008 May 2003 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 REMARK: Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(are) used in the place of company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here is(are) as follows: Competitors Symbols Utilized Company Name Model Name D51845 Dewalt PASLODE F-350SRH SENCO...

  • Page 3: Table Of Contents

    10-4. Disassembly and Reassembly of the Driving Section ..............34 10-5. Disassembly and Reassembly of the Cap and the Magazine Section .........35 11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ........... 37 12. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............38 Assembly Diagram for NR 83A2...

  • Page 4: Product Name

    2. MARKETING OBJECTIVE The new Model NR 83A2 strip nailer is a minor-changed version of the current Model NR 83A. Owing to the modification of the ANSI standard, the current Model NR 83A has gone out of production since the 1st of May 2003.

  • Page 5: Specifications

    5. SPECIFICATIONS 5-1. Specifications NR 83A2 Model Driving system Reciprocating piston type 5 -- - 8.5 kgf/cm (70 -- - 120 psi, 4.9 -- - 8.3 bar) (Gauge pressure) Operating pressure Driving speed 3 pcs./sec. Weight 3.6 kg (7.9 lbs.)

  • Page 6: Explanation Of The Nailing Operation

    5-2. Explanation of the Nailing Operation To meet the requirements of "ANSI SNT-101-2002", the Model NR 83A2 is equipped with a nailing operation switching device as shown in the figures below. Use SINGLE ACTUATION MECHANISM (SINGLE SEQUENTIAL ACTUATION MECHANISM) or CONTACT ACTUATION MECHANISM in accordance with the work to be performed.

  • Page 7: Nail Selection

    5-3. Nail Selection The Model NR 83A2 utilizes round-head nails collated with plastic resin into bands of 32 to 35 pieces. Applicable nail dimensions are shown below. CAUTION: Ensure that nails are as specified in Fig. 1. Other nails will cause clogging of nails and subsequent damage to the nailer.

  • Page 8: Nail Driving Force

    For example, when driving a nail of 3.3 mm dia. by 83 mm length (0.131" x 3-1/4") into nine sheets of 12 mm plywood (108 mm thick ) with the Model NR 83A2, a pressure of about 7.9 bar (8 kgf/cm , 115 psi) allows the nailer to drive the nail flush with the wood surface.

  • Page 9: Optional Accessories

    A full sequential actuation mechanism kit (sequential trip mechanism kit) is provided as an optional accessory for the Model NR 83A2. By using this optional accessory, a nail is driven by pressing the push lever first against a workpiece and then pulling the trigger (single-shot operation), and no nail is driven when pulling the trigger first and then pressing the push lever against a workpiece.

  • Page 10: Comparisons With Similar Products

    --- 7 ---...

  • Page 11: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model NR 83A2 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 Instruction Manual, and fully understands the meaning of the precautions listed on the Warning Label attached to each tool.

  • Page 12: Related Laws And Regulations

    7-3. Related Laws and Regulations As nailers and staplers are designed to instantaneously drive nails and staples, there is an ever-present danger of misfiring and subsequent possible serious injury. Accordingly, close attention in handling is absolutely necessary at all times. Carefully ensure that the customer is fully aware of the precautions listed in the Instruction Manual provided with each unit.

  • Page 13: Mechanism And Operation Principle

    The basic construction of the Model NR 83A2 is the same as that of the Model NR 83A and the interchangeable components are used as much as possible. However, most of the parts of the control valve section have been changed to provide the tool-less depth adjuster and the single actuation (single sequential actuation)/contact actuation mechanisms in order to correspond to the modification of the ANSI standard and the market demands.
  • Page 14 The numbers in the figure below correspond to the numbers in "8-3. Operation Principle". Safety valve portion Trigger valve portion Exhaust Valve < 2 > Trigger Exhaust Vent < 3 > Switching device Exhaust cover (Valve sleeve (A)) Piston < 4 > Valve bushing Control valve Cylinder <...

  • Page 15: Interchangeability

    Interchangeability of the parts between the Model NR 83A2 and the Model NR 83A is described below. The parts that are newly designed or changed for the Model NR 83A2 and not interchangeable with the Model NR 83A are described in detail.
  • Page 16 Parts that were newly designed or changed for the Model NR 83A2 and not interchangeable with the Model NR 83A (except the parts described in Part NR 83A2 NR 83A Caution The body ass'y is not Body Ass'y [25] interchangeable because the mounting method to the magazine section is different.
  • Page 17 (3) Control valve section Be careful not to make mistakes in mounting the following parts that were newly designed or changed for the Model NR 83A2 because these parts are similar to those of the Model NR 83A but they are not interchangeable.
  • Page 18 Parts that were newly designed or changed for the Model NR 83A2 and not interchangeable with the Model NR 83A (except the parts described in Part NR 83A2 NR 83A Caution Valve Bushing [57] These parts were newly designed to provide the single...
  • Page 19 (4) Magazine section Parts that were newly designed or changed for the Model NR 83A2 and not interchangeable with the Model NR 83A Part NR 83A2 NR 83A Caution Magazine [82] The Magazine [82] is not Nylock Bolt (Including Handle...

  • Page 20: Operation Principle

    8-3. Operation Principle The operation of the Model NR 83A2 is illustrated and described in Fig. 4 through 7. The circled numbers in the descriptions correspond to the item numbers shown in the mechanism illustrated in Fig. 3. In Fig. 5 and Fig. 7, read the descriptions in alphabetical order.
  • Page 21 Compressed air is applied Although air pressure is applied to both the to the upper side of the upper and lower sides of the cylinder, the Exhaust Valve < 2 >, forcing cylinder is forced downward due to the larger it downward and closing Cylinder ring effective area of the upper side.
  • Page 22 Air pressure is applied in the shaded areas in the illustration, and each component is held in the position illustrated. If the operator's grip is loosened, air will leak. As there is no o-ring installed here, a very small amount of air will leak from the slight clearance between the components.
  • Page 23 The air pressure on the upper surface of the Exhaust Valve < 2 > is released, and the exhaust valve is pushed upward by the air pressure within the cylinder. This opens the Exhaust Vent < 3 >, and the air pressure in the cylinder is discharged from the nailer.

  • Page 24: Troubleshooting Guide

    9. TROUBLESHOOTING GUIDE 9-1. Troubleshooting and Correction Problem Possible cause Inspection method Remedy 1) Nails cannot be driven. Magazine is not loaded with Check if the magazine is Use specified nails. specified genuine nails. normally loaded with Remove the abnormal nails and load the magazine with specified nails.
  • Page 25 Problem Remedy Possible cause Inspection method Adjust for 5 to 8.5 kgf/cm Set the single actuation/ Air pressure is too low. Replace the piston ring. contact actuation selector to the contact actuation. Piston O-ring is worn or Pull the nail feeder damaged.
  • Page 26 Problem Inspection method Remedy Possible cause Turn the adjuster to the Check if the adjuster is For short nails, the adjuster 2) Nails are bent lower position to decrease raised too high. is raised too high. when being the pressure. driven.
  • Page 27 Problem Inspection method Remedy Possible cause Replace the defective part. Set the single actuation/ Plunger O-ring (inside the 5) Single contact actuation selector to valve bushing) is abnormal actuation the single actuation. (worn or broken). impossible. Perform idle driving once and keep the nail feeder O-ring (P9, inside valve pulled backward.

  • Page 28: Possible Causes And Corrections Of Air Leakage

    9-2. Possible Causes and Corrections of Air Leakage Air leakage repair location --- 25 ---...
  • Page 29 Inspection priorities: In the table below, possible causes of air leakage and their repair procedures are marked in accordance with the likelihood of possible failure. (1) First priority items are marked with an asterisk ( ). (2) Second priority items (seal portions) are marked with a double circle ( (3) Remaining items are marked with a single circle ( ).
  • Page 30 Cause Air leak part When trigger valve ON/ When trigger valve/ When trigger valve/safety valve are OFF safety valve are ON safety valve OFF Scratched or damaged O-ring [60] inside Valve Safety valve Sleeve (A) [69] (When (continued.) single actuation is selected) Loose Hex.

  • Page 31: Disassembly And Reassembly

    (MULTEMP PS No. 2 Code No. 939301) must be applied to the O-rings and the sliding portions of the control valve section. Do not scratch the O-rings nor adhere dust to the O-rings when mounting. Oil required: Hitachi pneumatic tool lubricant 1 oz (30 cc) oil feeder (Code No. 877153) 4 oz (120 cc) oil feeder (Code No.

  • Page 32: Disassembly And Reassembly Of The Output Section

    10-2. Disassembly and Reassembly of the Output Section (1) Piston [12], Cylinder [17] and related parts Tool required: Hexagon bar wrench (5 mm) (a) Disassembly (See Figs. 8, 9 and 10.) Remove the four Hex. Socket Hd. Bolts (W/Sp. Washer) M6 x 25 [3], and take off the Exhaust Cover [4]. The Piston [12] can then be taken out.
  • Page 33 Head Cap and Gasket (C) [8] and Gasket (F) [6] should be replaced Gasket Set [10] with new genuine Hitachi parts. Fig. 11 Disassembly of main body, upper part Apply the designated grease to the outer circumference of the Exhaust Valve [9] prior to reassembly.
  • Page 34 Exhaust Valve [9] 1 mm dia. hole Cross-sectional view Fig. 12 (3) Piston Bumper (B) [27], Gasket (A) [28] and related parts (See Fig. 13.) Tools required Hexagonal bar wrench (5 mm, 6 mm) Roll pin puller (3 mm (0.118") dia.) (a) Disassembly Pull out the Roll Pin D3 x 45 [45] and remove the Guard (B) [44].
  • Page 35 Guard (B) [44] Roll Pin D3 x 45 [45] Body Ass'y [25] Plunger (B) Spring [73] Plunger (B) [74] Piston Bumper (B) [27] Nylock Bolt (W/Flange) Gasket (A) [28] M8 x 16 [35] High Tension Bolt M6 x 18 [29] Spring Washer M6 [30] Magazine [82] Guard (A) [31]...

  • Page 36: Disassembly And Reassembly Of The Control Valve Section

    10-3. Disassembly and Reassembly of the Control Valve Section Tools required: Roll pin puller (3 mm (0.118") dia.) Flat-blade screwdriver Setting pin (with a rounded tip) (a) Disassembly (See Fig. 15.) Remove the Magazine [82] as described in section 10-2-(3). Remove the pushing lever ass'y as described in section 10-2-(3).

  • Page 37: Disassembly And Reassembly Of The Driving Section

    Valve Bushing [57] 2.5 mm dia. hole Trigger [59] Body Ass'y [25] Fig. 17 10-4. Disassembly and Reassembly of the Driving Section Tools required Hexagonal bar wrench (5 mm and 6 mm) Roll pin puller (3 mm (0.118") dia.) (a) Disassembly (See Fig. 18.) Remove the Nose [32] and the pushing lever ass'y from the main body according to 10-2-(3) (Fig.

  • Page 38: 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 (See Fig. 19.) Tool required Cap [40] Hexagonal bar wrench (4 mm) Gasket (D) [39] Hex. Socket Hd. Bolt M5 x 18 [41] Body Ass'y [25] Fig.
  • Page 39 Nylon Nut M5 [80] Nylon Nut M4 [78] Spring Washer M5 [81] Spring Washer M4 [79] Sleeve [83] Nylon Nut M6 [36] Hex. Socket Hd. Bolt M5 x 45 [84] Handle Arm (B) [37] Hex. Socket Hd. Bolt M4 x 15 [85] Needle Roller [77] Ribbon Spring [76] Stopper Spring [89]...

  • Page 40: Inspection And Confirmation After Reassembly

    (120 psi). Check that there is no air leakage and the Model NR 83A2 does not operate (i.e., check that the Piston [12] does not come out of the Nose [32] tip (outlet of nails) when it is left for five seconds or more).

  • Page 41: Standard Repair Time (Unit) Schedules

    12. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow NR 83A2 Exhaust Cover Exhaust Piece Exhaust Valve Head Cap and Gasket Set Tail Cover Gasket x 4 Magazine Nail Feeder Ribbon Spring General Assembly Cylinder Pushing Lever...
  • Page 42 LIST NO. E008 PNEUMATIC TOOL PARTS LIST STRIP NAILER 2003 • • Model NR 83A2 (E1)
  • Page 43 PARTS NR 83A2 ITEM CODE NO. DESCRIPTION REMARKS USED 883-509 HEX. SOCKET HD. BOLT (W/FLANGE) M6X45 877-330 TOP COVER 883-507 HEX. SOCKET HD. BOLT (W/SP.WASHER) M6X25 877-324 EXHAUST COVER 877-325 GASKET (B) 877-329 GASKET (F) 877-328 EXHAUST PIECE 877-854 GASKET (C)
  • Page 44 PARTS NR 83A2 ITEM CODE NO. DESCRIPTION REMARKS USED 880-081 WASHER 949-657 HEX. SOCKET HD. BOLT M6X12 (10 PCS.) 875-643 PLUNGER SPRING 874-436 O-RING (P-4) 884-113 PLUNGER (A) 884-111 VALVE BUSHING 884-112 O-RING (I.D 10.7) 876-203 TRIGGER 872-645 O-RING (P-9)

  • Page 45: Standard Accessories

    STANDARD ACCESSORIES NR 83A2 ITEM CODE NO. DESCRIPTION REMARKS USED 872-422 HEX. BAR WRENCH 6MM 944-459 HEX. BAR WRENCH 5MM 944-458 HEX. BAR WRENCH 4MM 875-769 EYE PROTECTOR 882-413 CAUTION TAG 882-414 LEAFLET OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS...

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