Hitachi NR 65AK Service Manual
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Hitachi NR 65AK Service Manual

Hitachi NR 65AK Service Manual

Strip nailer
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MODEL
NR 65AK
POWER TOOLS
TECHNICAL DATA
STRIP NAILER
AND
NR 65AK
SERVICE MANUAL
N
LIST No. 1099
Sep. 2001
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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  • Page 1 MODEL NR 65AK POWER TOOLS TECHNICAL DATA STRIP NAILER NR 65AK SERVICE MANUAL LIST No. 1099 Sep. 2001 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 Notice for use Specifications and parts are subject to change for improvement. Refer to Hitachi Power Tool Technical News for further information.
  • Page 3 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 5250/65SPP PASLODE SN60MC SENCO...

  • Page 4: Table Of Contents

    10-4. Disassembly and Reassembly of the Driving Section ............28 10-5. Disassembly and Reassembly of the Cap and the Magazine Section ......31 11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ......... 36 12. STANDARD REPAIR TIME (UNIT) SCHEDULES ............37 Assembly Diagram for NR 65AK...

  • Page 5: Product Name

    4. Easy to adjust nail lengths The new nails specifically designed for the Model NR 65AK are also provided (refer to page 3). The Model NR 65AK has already been registered under the trade name of "STRAP TITE" as a strip nailer specifically designed for the metal hardware.

  • Page 6: Specifications

    5. SPECIFICATIONS 5-1. Specifications NR 65AK Model Driving system Reciprocating piston type 5.4 --- 8.3 bar (5.5 -- - 8.5 kgf/cm , 80 -- - 120 psi) (Gauge pressure) Operating pressure Driving speed 2 nails/sec. Weight 2.9 kg (6.4 lbs.)

  • Page 7: Nail Selection

    5-2. Nail Selection The Model NR 65AK utilizes heat treated round-head nails collated with paper into bands of 22 pieces. Applicable nail dimensions are shown below. However, it is recommended to use genuine HITACHI nails to ensure satisfactory driving quality.

  • Page 8: Nail Driving Force

    For example, when driving a nail of 3.3 mm dia. x 38 mm length (0.131" x 1-1/2") into a workpiece of hemlock with the Model NR 65AK, a pressure of about 5.5 bar (5.7 kgf/cm , 80 psi) allows the nailer to drive the nail flush with the wood surface.

  • Page 9: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS HITACHI Maker NR 65AK Model name 5.4 -- - 8.3 bar 5.4 -- - 8.3 bar 5.4 -- - 8.3 bar Operating pressure (5.5 --- 8.5 kgf/cm (5.5 --- 8.5 kgf/cm (5.5 --- 8.5 kgf/cm...

  • Page 10: Precautions In Sales Promotion

    7-2. Warning Label Each Model NR 65AK 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 11: Related Laws And Regulations

    8. MECHANISM AND OPERATION PRINCIPLE 8-1. Mechanism As illustrated in Fig. 6, NR 65AK 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 except the control valve section have been newly designed for maximum performance in a strip nailer.
  • Page 12 This tool has a sequential trip mechanism (single shot) for use when precision nail placement is necessary. You must first depress the nail point where you want to drive a nail and then pull the trigger. After the nail is driven, completely release the trigger and lift the tool off the work surface.
  • Page 13 Valve Piston (B) [44] Valve Bushing (B) [40] Plunger Spring (B) [46] Valve Bushing (A) [49] Plunger (A) [47] Control valve section Exhaust Vent Nail Gate [72] Top Cover [3] Head Valve Magazine Cover [71] (A) [10] O-Ring [16] Control valve section Cap [35] Piston (H) [17] Body Ass'y [18]...

  • Page 14: New Mechanism

    8-2. New Mechanism (1) Pushing lever mechanism (a) The tip of Pushing Lever (A) [30] is at the back of the nail point after loading nails in the Magazine [74]. Thus, the nail point can be easily inserted into the hole in the metal connector (Fig. 7). Trigger [52] Magazine [74] Pushing Lever (A)
  • Page 15 (c) By pulling the Trigger [52] when there is no workpiece near the nail point, the Trigger Arm [50] pushes up Pushing Lever (C) [24] and at the same time Pushing Levers (A) and (B) [30] and [28] move. At this time, Pushing Lever (B) [28] turns in the direction going far from Pushing Lever (A) [30] through the guide groove of the Trigger [52]...
  • Page 16 (2) Lockout feature mechanism This tool is equipped with a lockout feature that prevents the tool from being activated when there are 4 or less nails in the Magazine [74]. When the number of nails in the Magazine [74] becomes five or less, the Pushing Lever Stopper [80] moves the bent portion of Pushing Lever (C) Trigger [52] [24] downward.
  • Page 17 (b) When no nails are loaded in the Magazine [74]: By removing all the nails from the Magazine [74], the Nail Feeder [83] pushes the end of the Shaft [59] toward the Nose [20] and the end of the Shaft [59] comes off the groove of the Nail Gate [72]. Thus the Nail Gate [72] can be moved (Fig.

  • Page 18: Operation Principle

    8-3. Operation Principle (1) Before nailing: (Fig. 14 and Fig. 15) 1) When compressed air is fed to the main body, it fills the accumulator ( 2) At the same time, the compressed air flows into the valve piston lower chamber of the control valve section and forces Valve Piston (B) [44] upward.
  • Page 19 (3) During return: (Fig. 16 and Fig. 17) 1) When either Pushing Lever (A) [30] or Trigger [52] is released, Plunger (A) [47] goes down and the compressed air in the accumulator flows into the valve piston lower chamber. 2) As the air pressure in the valve piston lower chamber increases to overcome the air pressure applied on the upper portion of Valve Piston (B) [44], Valve Piston (B) [44] is forced...

  • Page 20: Troubleshooting Guide

    9. TROUBLESHOOTING GUIDE 9-1. Troubleshooting and Correction Possible cause Problem Inspection method Remedy : Most-common cause) 1) Nails cannot <Nails> Magazine is not loaded with Check if the magazine is Use specified nails. be driven. specified genuine nails. normally loaded with Remove the abnormal nails Magazine is loaded with specified nails.
  • Page 21 Possible cause Problem Inspection method Remedy : Most-common cause) Air passage is clogged Remove foreign matter. 1) Nails cannot with broken pieces of Replace the piston bumper be driven. piston bumper, etc. with new one. (continued) Body ... Remove foreign matter in the return air chamber.
  • Page 22 Possible cause Problem Inspection method Remedy : Most-common cause) < Output section:piston, driver 3) Nails cannot blade, etc. > be driven into Adjust the air pressure to Pull the nail feeder Air pressure is too low. the workpiece 5.4 - -- 8.3 bar backward and perform idle completely: (5.5 --- 8.5 kgf/cm...
  • Page 23 Possible cause Problem Inspection method Remedy : Most-common cause) <Driver blade is not returned 4) Nails jam. completely.> (continued) Perform idle or actual See item "1) Output section: See item "1) Output section: driving to check if the driver piston, driver blade, etc.". piston, driver blade, etc.".

  • Page 24: 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 25 Possible cause Air leakage points With control valve OFF With control valve ON (C) Nose (I) The O-Ring [13] of the Body Ass'y [18] is abnormal (broken or damaged). The Nylock High Tension Bolt M6 x 20 [21] is loose. The seal surface of the Body Ass'y [18] or the Nose [20] is abnormal (broken, deformed or scratched).

  • Page 26: 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 27: Disassembly And Reassembly Of The Output Section

    10-2. Disassembly and Reassembly of the Output Section (See Fig. 18) [Tool required] Hex. Socket Hd. Bolt M6 x 12 [1] Hex. bar wrench (4 mm) (a) Disassembly Plate [2] Remove the Hex. Socket Hd. Bolts M6 x 12 Top Cover [3] [1] with a hex.
  • Page 28 Mount the Cylinder Plate [12] to the Cylinder [15] facing the stopper of the Cylinder Plate [12] to the Piston Bumper [19]. When mounting to the Body Ass'y [18], fit the rib of the Body Ass'y [18] into the stopper groove of the Cylinder Plate [12] (Figs.

  • Page 29: Disassembly And Reassembly Of The Control Valve Section

    Body Ass'y [18] Since Plunger Spring (B) [46] is specially Roll Pin D3 x 28 [38] designed for the Model NR 65AK, it is not common to the other nailers. Do not use Trigger Arm [50] another plunger spring for the Model NR 65AK.
  • Page 30 Pull out the Roll Pin D3 x 28 [38] with the roll Push pin puller (3 mm (0.118") dia.), and take out the control valve in the following manner. Body Ass'y [18] 1) Remove the Exhaust Cover [5] by following Head Valve O- the procedure in (1), section 10-2.
  • Page 31 (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) [48] on Plunger (A) [47], O-Rings (I.D 11) [43], (S-18) [41] and (S-4) [45] on Valve Piston (B) [44], and the shaft of Plunger (A) [47] as shown in Fig.

  • Page 32: Disassembly And Reassembly Of The Driving Section

    10-4. Disassembly and Reassembly of the Driving Section (See Fig. 27) Nylock Bolt (W/Flange) M6 x 16 [31] Body Ass'y [18] Magazine Section Nylock Hex. Socket Hd. Bolt M4 x 12 [62] O-Ring (S-46) [13] Washer (B) [63] Nylock Bolt Nail Feeder Ass'y Sleeve [64] (W/Flange)
  • Page 33 (a) Disassembly Remove the Hex. Socket Hd. Bolt M6 x 12 [77] and Nylock Bolt (W/Flange) M6 x 16 [31] and take out the magazine section and the Guard [23]. Remove the Nylock High Tension Bolt M6 x 20 [21] and take out the Nose [20] . Pull out the Roll Pins D3 x 12 [22] and Pin [55A].

  • Page 34: Hex. Socket Hd. Bolt M6

    Mount the Nose [20] to the Body Ass'y [18] inserting Pushing Lever (C) [24] into the hole of the Pushing Lever Guide [54] (Fig. 30). Body Ass'y [18] To mount the magazine section to the Nose [20], Pushing Lever Guide [54] insert the Magazine Ring [75] into the Magazine [74] and sandwich it between the Nose [20] and the Magazine Plate [76] then secure them with the...

  • Page 35: 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 [35] (See Fig. 32.) [Tool required] Hex. bar wrench (4 mm) Cap [35] Hex. Socket Hd. Bolt M5 x 16 [36] Gasket (B) [34] Body Ass'y [18] Fig.
  • Page 36 Apply grease to the contacting portions of the Ribbon Spring [85] and the Nail Feeder [83]. Pushing Lever Stopper [80] No protrusion Ribbon Spring [85] from the surface Roll Pin D3 x 10 [79] Feeder Plate [81] Pin [82] Nail Feeder [83] Protrusion Feeder Spring [84] Protrusion...

  • Page 37: Machine Screw (W/Washer) M5

    (3) Disassembly and reassembly of the magazine section (See Fig. 35.) [Tool required] Hex. bar wrench (3 mm, 4 mm) Nail Gate [72] Magazine Cover [71] Machine Screw Shaft [59] (W/Washer) Machine Screw M5 x 16 (W/Washers) (Black) [70] M5x25 [73A] Nylon Nut M6 [65] Nylon Nut M5 [87] Flange Nut M5 [89]...
  • Page 38 (b) Reassembly Disassembly procedures should be followed in Ribbon Spring [85] Ribbon Spring Hook the reverse order. Note the following points: Hang the hook of the Ribbon Spring [85] on the edge of the Magazine [74] and put the nail feeder ass'y in the Magazine [74].
  • Page 39 Insert the Nail Rail [57] and two Guide Plates [58] Nail Rail [57] into the Magazine [74]. Align the holes of the Guide Plate [58] Magazine [74] with the holes of the Nail Rail [57] and the screws of the Guide Plates [58] (Fig. 38) and secure them with seven Hex.

  • Page 40: Inspection And Confirmation After Reassembly

    11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY Check that Plunger (A) [47] 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 misfiring and bending of nails.

  • Page 41: Standard Repair Time (Unit) Schedules

    12. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow NR 65AK Cylinder Plate Top Cover Cylinder Exhaust Cover Piston Bumper Packing (B) O-ring x 4 Head Bumper Head Valve Spring O-ring (P-22) Head Valve (A) General Assembly...
  • Page 42 LIST NO. 1099 PNEUMATIC TOOL PARTS LIST STRIP NAILER 2001 • • Model NR 65AK (E2) 61 65...
  • Page 43 PARTS NR 65AK ITEM CODE NO. DESCRIPTION REMARKS USED 949-657 HEX. SOCKET HD. BOLT M6X12 (10 PCS.) 880-515 PLATE 880-514 TOP COVER 949-822 HEX. SOCKET HD. BOLT M5X35 (10 PCS.) 883-451 EXHAUST COVER 883-452 GASKET (B) 882-914 HEAD BUMPER 882-913...
  • Page 44 PARTS NR 65AK ITEM CODE NO. DESCRIPTION REMARKS USED 882-894 TRIGGER 881-951 ROLL PIN D2.5X16 883-455 PUSHING LEVER GUIDE 883-438 883-458 NAIL RAIL 883-459 GUIDE PLATE 883-460 SHAFT 883-467 SPRING 883-465 WASHER 880-630 NYLOCK HEX. SOCKET HD. BOLT M4X12 962-569...

  • Page 45: Standard Accessories

    NR 65AK STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 875-769 EYE PROTECTOR 943-277 HEX. BAR WRENCH 3MM 944-458 HEX. BAR WRENCH 4MM 944-459 HEX. BAR WRENCH 5MM OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 883-469 MAGAZINE (S) ASS’Y...
  • Page 46 MEMO...

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