Hitachi NR 90AC2 Technical Data And Service Manual
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Hitachi NR 90AC2 Technical Data And Service Manual

Hitachi NR 90AC2 Technical Data And Service Manual

Strip nailer
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MODEL
NR 90AC2
POWER TOOLS
TECHNICAL DATA
STRIP NAILER
AND
NR 90AC2
SERVICE MANUAL
N
LIST No. E002
Sep. 2001
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi NR 90AC2

  • Page 1 MODEL NR 90AC2 POWER TOOLS TECHNICAL DATA STRIP NAILER NR 90AC2 SERVICE MANUAL LIST No. E002 Sep. 2001 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 (See Fig. 16.) .......... 24 10-5. Disassembly and Reassembly of the Cap and the Magazine Section ........25 11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ..........28 12. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............29 Assembly Diagram for NR 90AC2...

  • Page 4: Product Name

    Hitachi 90 mm (3-12") Strip Nailer, Model NR 90AC2 2. MARKETING OBJECTIVE The Model NR 90AC2 strip nailer is an upgraded version of the current Model NR 90AC, equipped with the demands for improvement but remained its powerful driving force capable of driving round-head nails. We are confident that your sales will increase with the new Model NR 90AC2.

  • Page 5: Specifications

    5. SPECIFICATIONS 5-1. Specifications NR 90AC2 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.) Dimensions 503 mm x 353 mm x 121 mm (Length x Height x Width) (19-13/16"...

  • Page 6: Nail Selection

    5-2. Nail Selection The Model NR 90AC2 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 7: Optional Accessories

    Sequential fire parts set: The Sequential Fire Parts Set is provided as an optional accessory for the Model NR 90AC2. By 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

    (2-3/8 -- 3-1/2") (2 -- 3-1/2") (2-3/8 -- 3-1/2") Note: The Model NR 90AC2 is equipped with a pushing Pushing Lever Stopper [72] lever stopper as an idling protector. The Pushing Lever Stopper [72] is placed over Pushing Lever (B)

  • Page 9: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model NR 90AC2 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 10: Related Laws And Regulations

    The following label is adhered to the Model NR 90AC2 for Europe to prohibit the use of the Model NR 90AC2 standing on a stepladder. Carefully ensure that customers fully understand and follow the precaution before using the tool. 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.

  • Page 11: Mechanism And Operation Principle

    8. MECHANISM AND OPERATION PRINCIPLE 8-1. Mechanism As illustrated in Fig. 4, the Model NR 90AC2 can be generally divided into four sections: output section, control valve section, driving section and magazine section. The magazine section has been newly designed though its basic construction is the same as that of the Model NR 90AC.

  • Page 12: Interchangeability

    The magazine section is not interchangeable between the Model NR 90AC2 and the NR 90AC because this section of the Model NR 90AC2 have been newly designed. The output section, the driving section and the control valve section are interchangeable except the following parts.
  • Page 13 Part NR 90AC2 NR 90AC Nose [30] NR 90AC2: 7 mm (0.276") NR 90AC: 4.5 mm (0.177") Spring [32] Pushing Lever (B) [33] Idling protector Guard [28] Collar (B) [29] Protruded Collar NR 90AC: 13.3 mm (0.524") NR 90AC: 10 mm (0.394")

  • Page 14: 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 15 (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 [46] is released, Plunger (A) [58] goes down and Accumulator the compressed air in the accumulator flows into Air passage Head Valve [10] the valve piston lower chamber.

  • Page 16: 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 17 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 18 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 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, flaw and damage.
  • Page 20 Possible cause Air leakage point With control valve OFF With control valve ON C) Nose 1 The Cylinder O-ring [26] of the Body [22] or the groove is abnormal (broken or flawed). The Hex. Socket Hd. Bolt M8 x 30 [61] is loose.

  • Page 21: 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 22: 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. 9A and Fig. 9B.) [Tools required] Hex. bar wrench (5 mm) Hex. Socket Hd. Bolt Hammer M6 x 16 [1] Plate [2]...
  • Page 23 (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 24: Disassembly And Reassembly Of The Control Valve Section (See Fig. 12.)

    10-3. Disassembly and Reassembly of the Control Valve Section (See Fig. 12.) [Tools required] Retaining Ring (E-type) Slotted head screwdriver for D6 Shaft [20] Roll pin puller (3 mm dia.) Roll Pin D3 x 22 [45] Body [22] Trigger (A) [46] Trigger Pin [47] Head Valve O-Ring (a) Disassembly...
  • Page 25 Pull out the Roll Pin D3 x 22 [45] 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 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) [59] of Plunger (A) [58], the O-Rings (S-4), (I.D. 8.8) and (I.D.

  • Page 27: Disassembly And Reassembly Of The Driving Section (See Fig. 16.)

    10-4. Disassembly and Reassembly of the Driving Section (See Fig. 16.) Roll Pin D3 x 28 [48] Body [22] Nylock Bolt (W/Flange) M6 x 20 [27] Handle Arm [64] Piston Bumper (A) [24] Pushing Lever Piston Bumper (B) [25] Guide [49] O-Ring (1AS-60) [26] Guard [28] Nylock Bolt (W/Flange)

  • Page 28: 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] Hex. bar wrench (4 mm) Hex. Socket Hd. Bolt M5 x 16 [43] Cap [42] Dust Filter [41] Gasket (B) [40] Body [22] Fig.
  • Page 29 (b) Reassembly Disassembly procedures should be followed in the reverse order. Note the following points. Insert the Nail Rail [63] from the rear of the Magazine [76] and press-fit the Nail Rail [63] into the Magazine [76] by tapping with a wooden hammer so that the protrusion of the Nail Rail [63] becomes flush with the rear end of the Magazine [76].
  • Page 30 (3) Nail Feeders (A) [68], (B) [72] and the related parts [Tool required] Roll pin puller (3 mm (0.118"), 4 mm (0.157") dia.) (a) Disassembly Fix Nail Feeder (B) [72] using a V-block and pull out the Roll Pin D4 x 40 [69] from the top using a roll pin puller (4 mm (0.157") dia.).

  • Page 31: Inspection And Confirmation After Reassembly

    Fig. 21 Note: The Model NR 90AC2 is equipped with a pushing lever stopper as an idling protector. The Pushing Lever Stopper [71] is placed over Pushing Lever (B) [33] to prevent the pushing lever ass'y 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.

  • Page 32: Standard Repair Time (Unit) Schedules

    12. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow NR 90AC2 Top Cover Exhaust Cover Gasket (A) Exhaust Valve Nose Rubber Magazine Head Valve Cover Spring Magazine Cylinder Nail Feeder (A) O-ring (B) Spring Head Valve...
  • Page 33 E002 LIST NO. PNEUMATIC TOOL PARTS LIST STRIP NAILER 2001 • • Model NR 90AC2 (E1) 43 44 71 72 73...
  • Page 34 PARTS NR 90AC2 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 35 PARTS NR 90AC2 ITEM CODE NO. DESCRIPTION REMARKS USED 878-885 O-RING (S-18) 981-317 O-RING (S-4) 880-672 VALVE PISTON (B) 878-925 O-RING (I.D 8.8) 878-887 O-RING (I.D 11) 878-884 PLUNGER SPRING 880-673 PLUNGER (A) 878-888 O-RING (I.D 1.8) 880-671 VALVE BUSHING (A) 949-759 HEX.

  • Page 36: Standard Accessories

    STANDARD ACCESSORIES NR 90AC2 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 EYE PROTECTOR 881-976 CAUTION TAG 882-414 LEAFLET OPTIONAL ACCESSORIES ITEM CODE NO.

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