Hitachi NR 1890DC Service Manual
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Hitachi NR 1890DC Service Manual

18 v cordless strip nailer
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PRODUCT NAME
Hitachi 18 V Cordless Strip Nailer
NR 1890DC NR 1890DBCL
Models
NR 1890DR NR 1890DBRL
CONTENTS
TROUBLESHOOTING GUIDE --------------------------------------------------------------------------------------- 1
1. Troubleshooting and corrective action --------------------------------------------------------------- 1
2. Corrective action when the orange LED blinks ---------------------------------------------------- 6
3. Maintenance mode --------------------------------------------------------------------------------------- 7
4. Resetting error mode (when the orange LED is blinking) --------------------------------------- 7
REPAIR GUIDE ---------------------------------------------------------------------------------------------------------- 8
1. Precautions on disassembly and reassembly ------------------------------------------------------ 8
• Preparation before disassembly --------------------------------------------------------------------- 8
• Disassembly and reassembly of the magazine section ---------------------------------------- 9
• Disassembly and reassembly of the output section ------------------------------------------ 12
• Replacement of the piston ass'y -------------------------------------------------------------------- 23
• Replacement of sensor (B) --------------------------------------------------------------------------- 26
• Feeding compressed air ----------------------------------------------------------------------------- 27
• Checking after reassembly ------------------------------------------------------------------------- 29
• Tightening torque ------------------------------------------------------------------------------------- 30
• Connecting diagram ---------------------------------------------------------------------------------- 31
STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------- 32
NR 1890DC
CONFIDENTIAL
NR 1890DC: K858
NR 1890DBCL:
NR 1890DR: K859
NR 1890DBRL:
Jul. 2017
NR 1890DR
Overseas Sales Division
Page
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Summary of Contents for Hitachi NR 1890DC

  • Page 1: Table Of Contents

    CONFIDENTIAL NR 1890DC: K858 NR 1890DBCL: NR 1890DR: K859 NR 1890DBRL: Jul. 2017 PRODUCT NAME Hitachi 18 V Cordless Strip Nailer NR 1890DC NR 1890DBCL Models NR 1890DR NR 1890DBRL Page CONTENTS TROUBLESHOOTING GUIDE --------------------------------------------------------------------------------------- 1 1. Troubleshooting and corrective action --------------------------------------------------------------- 1 2.

  • Page 2: Troubleshooting Guide

    Nails • Magazine is not loaded with • Check whether the • Use specified nails. cannot be specified Hitachi genuine nails. magazine is correctly • Remove abnormal driven. • Magazine is loaded with loaded with specified nails. nails and load the abnormal nails (e.g., bent nails,...
  • Page 3 Possible cause Problem Inspection method Corrective action (*: Most common cause) *• Worn-out piston tip • Check the piston tip for • Replace defective Nails are *• Broken or worn-out blade excessive wear. parts. See page 23. driven but rack •...
  • Page 4 (A) and parts. (B) for deformation, excessive wear, and burrs. • Misaligned assembly of blade • Set Hitachi genuine nails • Reassemble blade guide (B) and magazine in the nailer and lightly guide (B). See page 11.
  • Page 5 Possible cause Problem Inspection method Corrective action (*: Most common cause) • Dry-fire lockout mechanism • Count the number of • Load nails. No nailing is activated. remaining nails. There operation should be 9 or more without remaining nails. motor *•...
  • Page 6 Possible cause Problem Inspection method Corrective action (*: Most common cause) *• Broken movable part that • Check the movable part for • Replace defective No nailing disabled nailing work. any trouble (e.g., deformation, parts. operation break, excessive wear). with the •...

  • Page 7: Corrective Action When The Orange Led Blinks

    2. Corrective action when the orange LED blinks Orange LED lighting pattern Possible cause Corrective action • Reversed magnet polarity of position detector • Sensor (C) failure or Power switch is automatically turned off after • Replace defective parts. disconnection about 10 seconds.

  • Page 8: Maintenance Mode

    3. Maintenance mode Maintenance mode is used to move the piston down to the bottom dead point in preparation for feeding compressed air or overhauling the nailer. To set MAINTENANCE mode, hold down both the nailing operation switch* and the power switch on the operation panel for at least five seconds. *: The nailing operation switch is not provided for the products intended for New Zealand.

  • Page 9: Repair Guide

    [Bold] numbers in the description below correspond to the item numbers in the parts list and exploded assembly diagram for the Models NR 1890DC and NR 1890DBCL, and (Bold) numbers to those for the Models NR 1890DR and NR 1890DBRL.

  • Page 10: Disassembly And Reassembly Of The Magazine Section

    • Remove Pushing Lever Stopper (A) [72], Pushing Lever Stopper (B) [74], and two Springs [73] from Magazine Cover (A) [88]. • Remove the Nail Rail [87] from Magazine Cover (B) [84] and remove the Magazine Plate [87]. Fig. 4 • Models NR 1890DC and NR 1890DBCL [81] [84]...
  • Page 11 • Remove Pushing Lever Stopper (A) (72), Pushing Lever Stopper (B) (74), and two Springs (73) from Magazine Cover (A) (88). • Remove Nail Rail (C) (87) from Magazine Cover (B) (84) and remove the Magazine Plate (85). Fig. 5 • Models NR 1890DC and NR 1890DBRL (81) (84)
  • Page 12 2. Reassembly (1) Models NR 1890DC and NR 1890DBCL Reverse the disassembly procedure to reassemble. Note the following points: • Insert the protrusion of the Nail Rail [87] into the nail head inlet of Blade Guide (B) [76]. Fig. 6...

  • Page 13: Disassembly And Reassembly Of The Output Section

    Disassembly and reassembly of the output section 1. Removal of the power assembly and wiring • The nailer has two Housing Set [46](46) halves: housing (A) with a HITACHI logo mark on one side and housing (B) on the other side.
  • Page 14 2. Disassembly of the power assembly NOTE: • See pages 23 to 25 for replacement of only the Piston Ass'y [15](15). • Make alignment marks on the Chamber Base [10](10) and Cylinder [5](5) as shown in the figure below so as to indicate the coupling positions before disassembling the power assembly.
  • Page 15 • Remove the valve core from the Chamber Base [10](10) by using a commercial valve core tool. (See Fig. 11.) Fig. 11 Bit type Tip shape • Remove the four Nylock Bolts M6 [11](11) that fasten the Chamber Base [10](10) and Chamber Cover [4](4), and remove the Chamber Base [10](10).
  • Page 16 • Fix the hexagonal portion of the J-400 special socket. Fit the claws of the J-400 special socket in the notches on the end surface of the Cylinder [5](5). Loosen the Special Nut M58 [12](12) and turn the Nose [17](17) to remove it from the Cylinder [5](5). Fig.
  • Page 17 • Remove the Special Bolt M6 [37](37), Adjuster [41](41), Adjuster Spring [40](40), and Steel Ball D3.175 [39](39) from Pushing Lever (B) [38](38). • Remove the two Nylock Bolts M4 x 14 [35](35) and one Nylock Bolt M4 x 25 [19](19) from the Nose [17](17), then remove Blade Guide (A) [71](71).
  • Page 18 • Put the Pin Wheel [27](27) in the Nose [17](17). Facing the notch of the Pin Wheel [27](27) to Blade Guide (A) [70](70), push the Piston Ass'y [15](15) down to the bottom dead point without meshing with the eight Needle Rollers D4 [32](32) and Needle Roller D4.5 [26](26) as shown in Fig. 17. Fig.
  • Page 19 • Apply Molub-Alloy 777-1 grease to the following area on the Nose [17](17) and then mount Pushing Lever (B) [38](38). Fig. 20 Apply grease here. • Be sure to check Sensor (B) [63](63) according to pages 21 to 22 after reassembling the power assembly. •...
  • Page 20 • If it is difficult to mount the Gear Box [82](82) due to improperly meshed gears, turn the Rotor [83](83) by hand so that the gears are properly meshed. • Push the wires in housing (A) of Housing Set [46](46) with a flat-blade screwdriver being careful not to damage the coating as shown in Fig.
  • Page 21 • Check that the wires are not caught and there is no clearance between housings (A) and (B) when putting housing (A) and housing (B) together. Fig. 23 • After reassembly, check that the terminal of the Wiring [51](51) is properly mounted without mismatch and it is slightly movable as shown in Fig.
  • Page 22 4. Checking after reassembly of the power assembly • Check that Pushing Lever (A) [42](42) moves smoothly without any catch. • Check that the Adjuster [41](41) rotates smoothly. • Connect Sensor (B) [63](63) and Sensor (C) [60](60) to the Wiring [51](51) and then connect the terminal to the battery as shown in Fig.
  • Page 23 • Insert a pin punch of 5±0.1 mm in diameter between Pushing Lever (B) [38](38) and the wall of the Nose [17](17) where Sensor (B) [63](63) is inserted. Then push in Pushing Lever (A) [42](42) and keep pressing the power switch on the operation panel for at least 2 seconds. Check that the LED light on the operation panel turns on.

  • Page 24: Replacement Of The Piston Ass'y

    Replacement of the piston ass'y NOTE: When replacing only the Piston Ass'y [15](15) with new one, also replace the Needle Roller D4.5 [26](26) mounted in the Pin Wheel [27](27) with new one included in the brand-new Piston Ass'y [15](15). 1. Disassembly •...
  • Page 25 • Check that compressed air is completely released. Then remove the four Nylock Bolts M6 [11](11) from the Chamber Base [10](10) and Chamber Cover [4](4) to remove the Chamber Cover [4](4). NOTE: If it is difficult to remove the Chamber Base [10](10), temporarily tighten at least two Nylock Bolts M6 [11](11) so that the threaded portion is shown 3.5 mm to 6.5 mm as shown in Fig.
  • Page 26 Fig. 30 Pay special attention to the position of the Position Detector [25](25). If the Position Detector [25](25) is misaligned, the standby position of the [25](25) piston is also misaligned. (See page 29.) Notch Notch [27](27) • Remove dust from between the Pin Wheel [27](27) and Needle Roller D3 [30](30) and apply about 1.5 g of Molub-Alloy 777-1 grease to the Needle Roller D3 [30](30), eight Needle Rollers D4 [32](32), and Needle Roller D4.5 [26](26) evenly.

  • Page 27: Replacement Of Sensor (B)

    Replacement of sensor (B) • Remove Housing (C) [45](45), magazine ass'y, and Top Cover [2](2) to take out the power assembly referring to pages 8 to 12. • Remove the Nylock Hex. Socket Hd. Bolt M3 [69](69) and Guide Plate Holder [65](65) from the Nose [17](17), then remove Guide Plate (P) [68](68).

  • Page 28: Feeding Compressed Air

    Feeding compressed air CAUTION: • Be sure to set MAINTENANCE mode (see page 7) and move the Piston Ass'y [15](15) down to the bottom dead point before feeding or discharging compressed air. • Be sure to use the specified reduction valve set when feeding compressed air. •...
  • Page 29 • Push the valve core and check that no compressed air is left. • Apply lubricant to the O-ring (S-5) (Code No. 872822) of the charge screw. Always replace a defective O-ring with a new one. • Screw in the charge screw into the pressure feeding port of the Chamber Base [10](10). Fig.

  • Page 30: Checking After Reassembly

    Checking after reassembly • Check that no nail is loaded in the magazine. • Check that Pushing Lever (A) [42](42) moves smoothly without any catch. • Check that the Adjuster [41](41) rotates smoothly. • Check that the Trigger [54](54) moves smoothly. •...

  • Page 31: Tightening Torque

    Tightening torque Item No. Tightening torque Part name NR 1890DC NR 1890DR N•m lbf-ft NR 1890DBCL NR 1890DBRL Hex. Socket Bolt M6 9.8 ± 0.8 7.2 ± 0.6 Cylinder 82 ± 3 60.5± 0.2 Charge Cap 4.5 ± 0.5 3.3 ± 0.4...

  • Page 32: Connecting Diagram

    Connecting diagram Fig. 39 Sensor ass'y (B) Sensor ass'y (C) Pin wheel Trigger switch Push switch switch Ferrite core* (Models NR 1890DBCL and NR 1890DBRL only) 1. Red 2. White 3. Black 1. Red 2. Blue 1. Black 3. Black 2.

  • Page 33: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. NR 1890DC Work Flow NR 1890DBCL NR 1890DR Adjuster NR 1890DBRL Pushing Lever (A) Pin Wheel Pushing Position Lever (B) Detector Magnet General Assembly Chamber Blade Top Cover Cover Guide (A)
  • Page 34 LIST NO. K858 PNEUMATIC TOOL PARTS LIST CORDLESS STRIP NAILER 2017 · 7· 12 Model NR 1890DC (E1)
  • Page 35 PARTS NR 1890DC ITEM DESCRIPTION REMARKS CODE NO. CODE NO. USED 372298 HEX. SOCKET BOLT M6 372296 TOP COVER 371012 RUBBER CUSHION (C) 372337 CHAMBER COVER 372335 CYLINDER 372336 O-RING (I.D 55.5) 372334 O-RING (I.D 94.5) 371039 CHARGE CAP 872822...
  • Page 36 PARTS NR 1890DC ITEM DESCRIPTION REMARKS CODE NO. USED 371020 O-RING (I.D 2.5) 372291 WIRING 371019 SWITCH CABLE (A) 332000 SPRING (T) 371021 TRIGGER 331790 LEVER (C) 326276 LEVER (A) 372356 HOOK 331109 LOW HEAD HEX. SOCKET BOLT M4 X 8...
  • Page 37 STANDARD ACCESSORIES NR 1890DC ITEM DESCRIPTION REMARKS CODE NO. USED CHARGER (MODEL UC 18YSL3) CHARGER (MODEL UC 18YFSL) 943277 HEX. BAR WRENCH 3MM 944458 HEX. BAR WRENCH 4MM 875769 PROTECTIVE GLASSES 329897 BATTERY COVER 372294 TOOL BAG - 4 -...
  • Page 38 LIST NO. K859 PNEUMATIC TOOL PARTS LIST CORDLESS STRIP NAILER 2017 · 7· 12 Model NR 1890DR (E1)
  • Page 39 PARTS NR 1890DR ITEM DESCRIPTION REMARKS CODE NO. CODE NO. USED 372298 HEX. SOCKET BOLT M6 372296 TOP COVER 371012 RUBBER CUSHION (C) 372337 CHAMBER COVER 372335 CYLINDER 372336 O-RING (I.D 55.5) 372334 O-RING (I.D 94.5) 371039 CHARGE CAP 872822 O-RING (S-5) 372388 CHAMBER BASE...
  • Page 40 PARTS NR 1890DR ITEM DESCRIPTION REMARKS CODE NO. USED 371020 O-RING (I.D 2.5) 372291 WIRING 371019 SWITCH CABLE (A) 332000 SPRING (T) 371021 TRIGGER 331790 LEVER (C) 326276 LEVER (A) 372356 HOOK 331109 LOW HEAD HEX. SOCKET BOLT M4 X 8 372342 BUMPER (B) 372302...
  • Page 41 STANDARD ACCESSORIES NR 1890DR ITEM DESCRIPTION REMARKS CODE NO. USED CHARGER (MODEL UC 18YSL3) CHARGER (MODEL UC 18YFSL) 943277 HEX. BAR WRENCH 3MM 944458 HEX. BAR WRENCH 4MM 875769 PROTECTIVE GLASSES 329897 BATTERY COVER 372294 TOOL BAG - 4 - *ALTERNATIVE PARTS Printed in Japan 7 - 17...

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