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Hitachi NR 90AC3 Technical Data And Service Manual

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MODEL
NR 90AC3
Hitachi
Power Tools
TECHNICAL DATA
STRIP NAILER
AND
NR 90AC3
SERVICE MANUAL
N
LIST No. E013
Sep. 2003
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi NR 90AC3

  • Page 1 MODEL NR 90AC3 Hitachi Power Tools TECHNICAL DATA STRIP NAILER NR 90AC3 SERVICE MANUAL LIST No. E013 Sep. 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 SN65C SENCO F-350SRH Paslode...

  • Page 3: Table Of Contents

    10-4. Disassembly and Reassembly of the Driving Section ..............26 10-5. Disassembly and Reassembly of the Cap and the Magazine Section ........... 27 11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ............. 30 12. STANDARD REPAIR TIME (UNIT) SCHEDULES ................ 31 Assembly Diagram for NR 90AC3...

  • Page 4: Product Name

    2. MARKETING OBJECTIVE The new Model NR 90AC3 strip nailer is a minor-changed version of the current Model NR 90AC2. Owing to the modification of the ANSI standard, the current Model NR 90AC2 has gone out of production since the 1st of May 2003.

  • Page 5: Specifications

    5. SPECIFICATIONS 5-1. Specifications NR 90AC3 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 4.0 kg (8.9 lbs.)

  • Page 6: Explanation Of The Nailing Action

    5-2. Explanation of the Nailing Action To meet the requirements of "ANSI SNT-101-2002", the Model NR 90AC3 is equipped with a nailing operation switching device at the valve portion 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 90AC3 utilizes round-head nails collated with plastic resin into bands of 25 to 30 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: Optional Accessories

    Full sequential actuation mechanism kit (Sequential trip mechanism kit) is provided as an optional accessory for the Model NR 90AC3. 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 actuation).

  • Page 9: Comparisons With Similar Products

    Note: The Model NR 90AC3 is equipped with a pushing lever stopper as an idling protector. The Pushing Lever Stopper [74] is placed over Pushing Lever (B) [33] to prevent Pushing Lever (B) [33] from being pushed up when no nail is loaded in the magazine or the number of nails remained in the magazine is five or less (depending on the types of nails).

  • Page 10: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model NR 90AC3 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

    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 Handling Instructions provided with each unit.

  • Page 12: Mechanism And Operation Principle

    Output section, control valve section, driving section and magazine section. Although the basic construction of the Model NR 90AC3 is the same as that of the Model NR 90AC2 and interchangeable components are used as much as possible, the Model NR 90AC3 is provided with the single actuation (single sequential actuation)/contact actuation mechanisms in order to correspond to the modification of the ANSI standard.

  • Page 13: Interchangeability

    90AC2 and all the parts of the driving section and the magazine section are interchangeable with those of the Model NR 90AC2. The parts that are newly designed, changed, or added for the Model NR 90AC3 and not interchangeable with those of the Model NR 90AC2 are described in detail.
  • Page 14 (2) Control valve section (continued) Part NR 90AC3 NR 90AC2 Common to the Model NT 65MA2. Plunger (A) [61] Be careful not to make mistakes in mounting plunger (A) because it is similar to that of the Model NR 65AK and other models but not interchangeable.

  • Page 15: Operation Principle

    8-3. Operation Principle Exhaust Valve Rubber [7] (1) Before nailing (See Fig. 5 and Fig. 6.) Exhaust vent Head valve chamber 1) When compressed air is fed to the main body, it Head Valve fills the accumulator ( portion). Spring [8] Air passage 2) At the same time, the compressed air flows into Head Valve [10]...
  • Page 16 (3) During return (See Fig. 7 and Fig. 8.) Exhaust Valve Rubber [7] 1) When either Pushing Lever (A) [37] or Trigger (A) Head valve chamber Exhaust vent [47] is released, Plunger (A) [61] goes down and Accumulator the compressed air in the accumulator flows into Air passage Head Valve [10] the valve piston lower chamber.
  • Page 17 (4) Single actuation mechanism/contact actuation mechanism: (Fig. 9 and Fig. 10) Single/contact actuation mechanism changeover is accomplished by turning the switching device (Change Knob [50]). Single actuation mechanism (Switching device: Accumulator upward position): 1) Immediately after driving the first nail, the control valve should be as shown in Fig.

  • Page 18: Troubleshooting Guide

    9. TROUBLESHOOTING GUIDE 9-1. Troubleshooting and Correction Problem Possible cause Inspection method Remedy 1) Nails cannot <Nails> 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 specified nails.
  • Page 19 Problem Inspection method Remedy Possible cause < Output section > Air pressure is too low. Adjust for 5 to 8.5 kgf/cm Pull the nail feeder Replace the piston ring. backward and perform idle Piston O-ring is worn or driving. Check if the driver damaged.
  • Page 20 Possible cause Problem Inspection method Remedy Turn the adjuster to the Check if the adjuster is For short nails, the adjuster 2) Nails are bent raised too high. lower position to decrease is raised too high. when being the pressure. driven.

  • Page 21: Possible Causes And Correction Of Air Leakage

    9-2. Possible Causes and Correction 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, flaw and damage.
  • Page 22 Possible cause Air leakage point With control valve OFF With control valve ON C) Nose 1 The Cylinder O-ring [11] of the Body [22] or the groove is abnormal (broken or flawed). The Hex. Socket Hd. Bolt M8 x 30 [64] is loose.

  • Page 23: Disassembly And Reassembly

    Apply grease (ATTOLUB No. 2) (Code No. 317918) 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 24: Disassembly And Reassembly Of The Output Section

    10-2. Disassembly and Reassembly of the Output Section (1) Disassembly and reassembly of the Exhaust Cover [5], Head Valve [10], Exhaust Valve Rubber [7], etc. (See Fig. 11A and Fig. 11B.) [Tools required] Hex. bar wrench (5 mm) Hex. Socket Hd. Bolt Hammer M6 x 16 [1] Plate [2]...
  • Page 25 (b) Reassembly Exhaust Cover [5] Disassembly procedures should be followed in the Exhaust Valve Head Valve [10] Rubber [7] reverse order. Note the following points. Charge the sliding portion of the Head Valve [10] of the Exhaust Cover [5] with about 3 grams of grease and apply grease to each surface of the O-rings.

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

    10-3. Disassembly and Reassembly of the Control Valve Section (See Fig. 14.) Retaining Ring (E-type) [Tools required] for D6 Shaft [20] Flat-blade screwdriver Roll pin puller (3 mm dia.) Roll Pin D3 x 22 [46] Body [22] Trigger (A) [47] Steel Ball D3.97 [48] Carefully disassemble so as not to lose these parts.
  • Page 27 Pull out the Roll Pin D3 x 22 [46] with the roll pin puller (3 mm dia.), and take out the Push control valve in the following manner. 1) Remove the Exhaust Cover [5] by following the procedure in (1), item 10-2. Body [22] 2) As shown in Fig.
  • Page 28 (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) [62] of Plunger (A) [61], the O-Rings (S-4) [56], (I.D. 8.8) [58] and (I.D.

  • Page 29: Disassembly And Reassembly Of The Driving Section

    10-4. Disassembly and Reassembly of the Driving Section (See Fig. 19.) Roll Pin D3 x 28 [51] Body [22] Nylock Bolt (W/Flange) M6 x 20 [27] Handle Arm [67] Piston Bumper (A) [24] Pushing Lever Piston Bumper (B) [25] Guide [52] O-Ring (1AS-60) [26] Guard [28] Nylock Bolt (W/Flange)

  • Page 30: 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. 21.) [Tool required] Hex. bar wrench (4 mm) Hex. Socket Hd. Bolt M5 x 16 [44] Cap [43] Dust Filter [42] Gasket (B) [41] Body [22] Fig.
  • Page 31 (b) Reassembly Disassembly procedures should be followed in the reverse order. Note the following points. Insert the Nail Rail [66] from the rear of the Magazine [79] and press-fit the Nail Rail [66] into the Magazine [79] by tapping with a wooden hammer so that the protrusion of the Nail Rail [66] becomes flush with the rear end of the Magazine [79].
  • Page 32 (3) Nail Feeders (A) [71], (B) [75] and the related parts [Tool required] Roll pin puller (3 mm (0.118"), 4 mm (0.157") dia.) (a) Disassembly Fix Nail Feeder (B) [75] using a V-block and pull out the Roll Pin D4 x 40 [72] from the top using a roll pin puller (4 mm (0.157") dia.).

  • Page 33: Inspection And Confirmation After Reassembly

    Set the Change Knob [50] to "single actuation (single sequential actuation)" (see 5-2). Check that the Model NR 90AC3 operates by pressing the Pushing Lever (A) [37] against a test piece first then pulling Trigger (A) [47]. Check that the Piston [19] is still showing from the Nose [30] tip (outlet of nails) after the Pushing Lever (A) [37] is released from the test piece with the Trigger (A) [47] pulled.

  • Page 34: Standard Repair Time (Unit) Schedules

    12. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow NR 90AC3 Exhaust Cover Gasket (A) Exhaust Valve Rubber Head Valve Spring Nose Cylinder Magazine O-ring (B) Magazine Head Valve Cover Cylinder O-ring Nail Feeder (A) Head Valve...
  • Page 35 Hitachi Power Tools LIST NO. E013 PNEUMATIC TOOL PARTS LIST STRIP NAILER 2003 • • Model NR 90AC3 (E1) 74 75 76...
  • Page 36 PARTS NR 90AC3 ITEM CODE NO. DESCRIPTION REMARKS USED 949-755 HEX. SOCKET HD. BOLT M6X16 (10 PCS.) 880-515 PLATE 880-514 TOP COVER 882-793 HEX. SOCKET HD. BOLT (W/FLANGE) M6X35 881-946 EXHAUST COVER 881-940 GASKET (A) 881-945 EXHAUST VALVE RUBBER 881-944...
  • Page 37 PARTS NR 90AC3 ITEM CODE NO. DESCRIPTION REMARKS USED 880-361 PUSHING LEVER GUIDE 877-699 HEAD VALVE O-RING (I.D 16.8) 878-881 VALVE BUSHING (B) 878-885 O-RING (S-18) 981-317 O-RING (S-4) 884-143 VALVE PISTON (B) 878-925 O-RING (I.D 8.8) 878-887 O-RING (I.D 11)

  • Page 38: Standard Accessories

    NR 90AC3 STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 881-968 NOSE CAP 944-458 HEX. BAR WRENCH 4MM 944-459 HEX. BAR WRENCH 5MM 872-422 HEX. BAR WRENCH 6MM 875-769 SAFETY GLASSES 884-146 CAUTION TAG 884-120 LEAFLET OPTIONAL ACCESSORIES ITEM CODE NO.

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