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Hitachi NV 90HMC Technical Data And Service Manual

3-1/2” high pressure coil nailer
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PRODUCT NAME
Hitachi 3-1/2" High Pressure Coil Nailer
NV 90HMC
Model
MARKETING OBJECTIVE
The new Model NV 90HMC is a high-pressure type [3-1/2" (90 mm)] of coil nailer. High-pressure nailer series
products have already been introduced to the Japanese market and become popular nationwide. This new
product offers higher punching force about three times greater than that of conventional nailers, in order to
reduce its size and weight. The new Model NV 90HMC also features strong punching force, a nose switch
mechanism, blow nozzle, dual action trigger, and a tool-less adjuster. Please expand sales of the new Model
NV 90HMC Nailer.
APPLICATIONS
• Floor and wall framing
• Truss and window built-up
• Subflooring and roof decking
• Crate and pallet construction
SELLING POINTS
[NEW FEATURES]
Lightweight and Compact
Powerful
Nose switch mechanism
Blow nozzle
Dual action trigger
Tool-less adjuster
Easy nail loading
Lock mechanism of trigger
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
LIST No.
NV 90HMC: E061
Dec. 2009
International Sales Division
N

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  • Page 1 Model MARKETING OBJECTIVE The new Model NV 90HMC is a high-pressure type [3-1/2" (90 mm)] of coil nailer. High-pressure nailer series products have already been introduced to the Japanese market and become popular nationwide. This new product offers higher punching force about three times greater than that of conventional nailers, in order to reduce its size and weight.
  • Page 2 REMARK: • For more information about HANDLING INSTRUCTIONS, visit our website at: http://www.hitachi-koki.com/manual_view_export/ • 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:...

  • Page 3: Table Of Contents

    1. Safety Instructions ----------------------------------------------------------------------------------------------- 8 TROUBLESHOOTING GUIDE -------------------------------------------------------------------------------------------- 10 1. Troubleshooting and Repair -------------------------------------------------------------------------------- 10 2. Possible Causes and Corrections of Air Leakage------------------------------------------------------ 15 REPAIR GUIDE---------------------------------------------------------------------------------------------------------------- 18 1. Precautions on Disassembly and Reassembly --------------------------------------------------------- 18 Assembly Diagram for NV 90HMC...

  • Page 4: Selling Points

    Powerful punching force about 1.3 times greater than that of our conventional NV 90AH Nailer. High pressure nailer Conventional nailer High pressure nailer Model NV 90HMC NV 90AB Weight 2.5 kg (5.5 lbs.) 3.0 kg (6.6 lbs.) 2.5 kg (5.5 lbs.) Height 322 mm (12-11/16”)
  • Page 5 Dual action trigger This function automatically switches between "Single sequential actuation mode" and "Contact actuation mode" according to the operation sequence. This function can prevent unwanted double firing in "Single sequential actuation mode." Tool-less adjuster Rotating this adjuster adjusts the nailing depth (sink quantity of the nail head). Shallow Deep Adjuster...

  • Page 6: Specifications

    The air plug of the Model NV 90HMC is exclusively designed for high pressure and cannot be connected to any air hoses and compressors that are generally used at much lower air...

  • Page 7: Nail Selection

    2. Nail Selection The Model NV 90HMC utilizes common wire-collated and sheet-collated nail coils of 150 to 300 round-head nails. Applicable nail dimensions are shown below. However, genuine HITACHI nail coils should be used to assure satisfactory nailing quality. CAUTION: Ensure that nails are as specified in Fig. 1. Using other nails will cause nail jams and consequent nailer damage.
  • Page 8 Fig. 2 • Required nailing energy and nailer output energy Required nailing energy Nailer output energy...

  • Page 9: Adjusting The Nailing Depth

    • Note that when you raise the Model NV 90HMC from the floor (after pressing the pushing lever against the floor) with the trigger pulled, single sequential actuation mode is automatically selected. Therefore, nails are not punched even when you press the pushing lever against the workpiece.

  • Page 10: Comparison With Similar Products

    COMPARISON WITH SIMILAR PRODUCTS 1. Comparison of Specifications (Superior specifications: HITACHI Maker Model NV 90HMC NV 90AB (High pressure nailer) Item (High pressure nailer) (Conventional nailer) 12 to 23 bar 4.9 to 8.3 bar 12 to 23 bar Operating pressure (12 to 23 kgf/cm (5 to 8.5 kgf/cm...

  • Page 11: Precautions On Sales Promotion

    1. Safety Instructions In the interest of promoting the safest and most efficient use of the Model NV 90HMC Nailer by all of our customers, it is very important when concluding a sale that the salesperson carefully ensure that the buyer seriously recognizes the importance of the Instruction Manual, and fully understands the precautions listed on the Warning Label attached to each tool.
  • Page 12 (320 psi, 23 bar) or less. (2) If the dust in compressed air accumulates on the sliding portion, the Model NV 90HMC will not operate properly. Lubrication effectively removes dust and also prolongs the service life of the Model NV 90HMC in terms of maintaining good performance.

  • Page 13: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. Troubleshooting and Repair Possible cause Problem Inspection method Corrective action ( *: Most-common cause) <Nails> Nails cannot • Magazine is not loaded • Check that the magazine • Use specified nails. be punched. with specified genuine is correctly loaded with •...
  • Page 14 Possible cause Problem Inspection method Corrective action ( *: Most-common cause) • Air leaks from the gap • Tighten screws and check Nails cannot between the body and the the O-rings. be punched. nose. (continued) • O-rings are worn or •...
  • Page 15 Possible cause Problem Inspection method Corrective action ( *: Most-common cause) • Cylinder inner surface is • Check that nails can be • Remove dust and then Nails cannot abnormal (packed with punched at 4.9 bar (5 lubricate. be punched. dust or worn).
  • Page 16 Possible cause Problem Inspection method Corrective action ( *: Most-common cause) *• Driver blade is worn. • Perform idle punching to • Replace the part. Nails cannot check whether the driver blade protrudes from the completely nose tip. punched *• Piston O-ring is abnormal •...
  • Page 17 Possible cause Problem Inspection method Corrective action ( *: Most-common cause) <Body: Nail feeding is Nails jam. incomplete.> (continued) • Feeder is worn and the • Open the nail guide and • Replace abnormal parts. sliding section abnormal. check the position of the •...

  • Page 18: Possible Causes And Corrections Of Air Leakage

    2. Possible Causes and Corrections of Air Leakage 1. Air leakage repair location • Air leakage repair location Control valve section Magnified view of B Section of A - A -15-...
  • Page 19 (3) Next, check the other possible parts. [Bold] numbers in the description below correspond to item numbers in the Parts List and exploded assembly diagram for the Model NV 90HMC. Possible causes Air leak point...
  • Page 20 Possible causes Air leak point Control valve OFF Control valve ON Control valve Defect on O-Ring (P7-U) [89] of Valve Defect on O-Ring (1AP-11) [92] and O- exhaust port Piston [91] (worn, cut or flaws) Ring (P9-U) [90] of Valve Piston [91] Defect on O-Ring (I.D 1.8) [94] of Plunger (worn, cut or flaws) [95] (worn, cut or flaws)

  • Page 21: Repair Guide

    The following describes the most essential precautions on disassembly and reassembly of the nailer. The NV 90HMC Coil Nailer mainly consists of six sections: output section, air duster valve section, control valve section, magazine section, nail feeder section and cap section.

  • Page 22: Disassembly And Reassembly Of The Output Section

    Disassembly and Reassembly of the Output Section 1. Disassembly and reassembly of the Upper Cover Exhaust Cover Piston (H) cylinder ass’y [Tools required] • Hex. bar wrench (4 mm) Seal Lock Hex.Socket Flat Hd. Bolt M5 x 10 [1] • Phillips screwdriver •...
  • Page 23 • First mount the Cylinder Plate [38] on the • Reassembly of the cylinder ring Cylinder Ring [40], and then place the thinner part over the air hole of the Cylinder [36]. Cylinder [36] Air hole Cylinder Ring [40] • Be sure to first mount the Valve Plate [24] on •...
  • Page 24 Disassembly and Reassembly of the Air Duster Valve Section [Tools required] • Socket wrench (14 mm) • Flat-blade screwdriver Retaining Ring (E-Type) For D4 Shaft [34] Valve Bushing [33] Knob [35] (left-handed thread) O-Ring (S3) [32] O-Ring (1AP-3) [30] O-Ring (S-10) [31] Plunger [29] Upper Cover [5] Plunger O-Ring [28]...

  • Page 25: Disassembly And Reassembly Of The Control Valve Section

    Disassembly and Reassembly of the Control Valve Section [Tools required] • Roll pin puller (ø 3, ø 2.5) • Flat-blade screwdriver O-Ring (S-14) [86] Feeder Shaft Ring [41] O-Ring (S-16) [87] Machine Screw (W/Washers) Valve Bushing (B) [88] M5 x 25 (Black) [105] O-Ring (P7-U) [89] Roll Pin D3 x 28 [100] O-Ring (P9-U) [90]...
  • Page 26 (2) Reassembly Conduct reassembly by reversing the disassembly procedure, but note the following: (a) Reassembly of the control valve section • Always keep the control valve section clean. • Fully apply grease to the O-Ring (S-16) [87], O-Ring (1AP-5) [96] and O-Ring (S-6) [97] of Valve Bushing (A) [98], O-Ring (I.D 1.8) [94] of the Plunger [95], O-Ring (P7-U) [89], O-Ring (P9-U) [90] and O-Ring (1AP-11) [92] of the Valve Piston [91], and O-Ring (S-14) [86] and O-Ring (S-16) [87] of Valve Bushing (B) [88].
  • Page 27 (b) Reassembly of the Trigger section • Reassemble Trigger Arm (C) [67] with its protrusion facing upward. • Reassemble the Roll Pin D2.5 x 16 [72] with its splitting oriented as shown below. • Reassembly of the Trigger section Protrusion of Trigger Arm (C) [67] Trigger Piece (C) [65] Trigger [68] Roll Pin D2.5 x 16 [72]...

  • Page 28: Disassembly And Reassembly Of The Magazine Section

    Disassembly and Reassembly of the Magazine Section 1. Disassembly and reassembly of the magazine ass'y [Tools required] • Disassembly and reassembly of the • Flat-blade screwdriver magazine ass'y • Phillips screwdriver • Roll pin puller (ø 4, ø 2.5) • Hex. bar wrench (4 mm) •...
  • Page 29 • Disassembly and reassembly of the magazine section Body Ass'y [42] Machine Screw (W/Washers) M5 x 25 (Black) [105] Nylon Nut M5 [134] Warning Label [139] Pin [140] Magazine [137] Feeder Shaft Ring [141] Nylon Nut M5 [134] Pin [140] Magazine Cover [142] Sleeve [135] Pushing Lever...
  • Page 30 2. Disassembly and reassembly of the Nail Holder , the Holder Shaft , etc (1) Disassembly • Pull out the two Pins [140] by using the roll pin puller (φ4). The Magazine [137] and Magazine Cover [142] can then be removed. •...
  • Page 31 Disassembly and Reassembly of the Nail Feeder Section [Tools required] • Hex. bar wrench (5 mm ) • Roll pin puller (ø 4, ø 2) • C-shaped snap ring puller for hole Retaining Ring For D24 Hole [114] Body Ass'y [42] Feed Piston Cover [113] O-Ring (1AP-3) [106] Bumper [112]...
  • Page 32 1. Disassembly and reassembly of Nose, Pushing Lever (A), etc (1) Disassembly • Remove the four Nylock High Tension Bolts M7 x 25 [56]. The Nose [47] and Pushing Lever (A) [59] can then be removed. • Remove the Shaft Ring [117] of Nose Piece (A) [122] by using the slotted screwdriver. You can then detach Nose Piece (A) [122], the Nose Shaft [119], two Nose Sleeves [118], Spring [121], Urethane Shaft [120] and Nose Bumper [116].
  • Page 33 3. Disassembly and reassembly of the Piston Bumper, Feeder (A), Feed Piston, etc (1) Disassembly • Remove the Nose [47] and push the lever components from the output section according to item 1 in "Disassembly and Reassembly of the Nail Feeder Section". You can then remove the Piston Bumper [45].
  • Page 34 4. Disassembly and reassembly of Nail Guide, Nail Stopper (A), Nail Stopper (B), etc [Tools required] • Flat-blade screwdriver • Hex. bar wrench (3 mm) (1) Disassembly • Remove the Shaft Ring [117] of the Nail Guide Shaft [57] by using the slotted screwdriver, and then pull out the Nail Guide Shaft [57].
  • Page 35 Disassembly and Reassembly of the Cap Section [Tools required] • Wrench (width: 21 mm) (1) Disassembly Dust Cap [63] • The Cap [62] is unified with an Cap [62] M42 left-handed thread and (left-hand thread) can be removed by using a wrench.
  • Page 36 LIST NO. E061 PNEUMATIC TOOL PARTS LIST HIGH PRESSURE COIL NAILER 2009 12 11 Model NV 90HMC (E1) 67 71...
  • Page 37 PARTS NV 90HMC ITEM CODE NO. DESCRIPTION REMARKS USED 887-128 SEAL LOCK HEX.SOCKET FLAT HD. BOLT M5 X 10 885-264 WASHER 886-890 PROTECTOR 885-854 NYLOCK BOLT M5 X 65 886-901 UPPER COVER 886-898 HEAD BUMPER 886-904 HEAD GUIDE 886-902 PACKING (B)
  • Page 38 PARTS NV 90HMC ITEM CODE NO. DESCRIPTION REMARKS USED 949-498 ROLL PIN D4 X 18 (10 PCS.) 883-144 FEEDER ARM (B) 883-143 FEEDER SPRING 886-886 FEEDER (A) 883-093 PLUNGER (B) 993-040 NYLOCK HIGH TENSION BOLT M7 X 25 883-091 NAIL GUIDE SHAFT...
  • Page 39 PARTS NV 90HMC ITEM CODE NO. DESCRIPTION REMARKS USED 959-148 STEEL BALL D3.175 (10 PCS.) 882-923 LOCK SPRING 886-727 LOCK KNOB CAUTION PLATE (C) 880-734 MACHINE SCREW (W/WASHERS) M5 X 25 (BLACK) 873-093 O-RING (1AP-3) 872-645 O-RING (P-9) 877-763 FEED PISTON O-RING (I.D. 14)
  • Page 40 PARTS NV 90HMC ITEM CODE NO. DESCRIPTION REMARKS USED NAME PLATE 887-174 WARNING LABEL 886-624 TRIGGER ARM ASS'Y INCLUD. 65-67, 71 887-317 MAGAZINE ASS'Y INCLUD. 137, 140-142, 144-150 12 - 09 - 5 - *ALTERNATIVE PARTS...

  • Page 41: Standard Accessories

    STANDARD ACCESSORIES NV 90HMC ITEM CODE NO. DESCRIPTION REMARKS USED 883-136 PNEUMATIC TOOL LUBRICANT (30 CC) 875-769 SAFETY GLASSES 886-432 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 881-768 GRIP TAPE (A) 880-407 TAPE 876-212 PNEUMATIC TOOL LUBRICANT (1 L)

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