1. Manuals
  2. Brands
  3. Koki Holdings Manuals
  4. Nail Gun
  5. NR 1890DCA
  6. Service manual

Koki Holdings NR 1890DCA Service Manual

18 v cordless strip nailer
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
PRODUCT NAME
18 V Cordless Strip Nailer
NR 1890DCA, NR 1890DCA(S),
Models
NR 1890DRA
CONTENTS
TROUBLESHOOTING GUIDE --------------------------------------------------------------------------------------- 1
1. Troubleshooting and corrective action --------------------------------------------------------------- 1
2. Corrective action when the orange LED blinks ---------------------------------------------------- 6
3. Maintenance mode --------------------------------------------------------------------------------------- 7
4. Nail counter check mode -------------------------------------------------------------------------------- 7
5. Resetting error mode (when the orange LED is blinking) --------------------------------------- 8
REPAIR GUIDE ---------------------------------------------------------------------------------------------------------- 9
1. Precautions on disassembly and reassembly ------------------------------------------------------ 9
• Preparation before disassembly --------------------------------------------------------------------- 9
• Disassembly and reassembly of the magazine section -------------------------------------- 10
• Disassembly and reassembly of the output section ------------------------------------------ 13
• Replacement of the piston ass'y -------------------------------------------------------------------- 24
• Replacement of sensor (B) and sensor (C) ------------------------------------------------------ 26
• Feeding compressed air ---------------------------------------------------------------------------- 27
• Checking after reassembly ------------------------------------------------------------------------- 29
• Tightening torque ------------------------------------------------------------------------------------- 29
• Connecting diagram ---------------------------------------------------------------------------------- 30
STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------- 31
NR 1890DCA
NR 1890DCA(S)
CONFIDENTIAL
NR 1890DRA
Overseas Sales Management Dept.
Nov. 2024
Page
N

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the NR 1890DCA and is the answer not in the manual?

Questions and answers

Related Manuals for Koki Holdings NR 1890DCA

Summary of Contents for Koki Holdings NR 1890DCA

  • Page 1: Table Of Contents

    CONFIDENTIAL Nov. 2024 PRODUCT NAME 18 V Cordless Strip Nailer NR 1890DCA, NR 1890DCA(S), Models NR 1890DRA Page CONTENTS TROUBLESHOOTING GUIDE --------------------------------------------------------------------------------------- 1 1. Troubleshooting and corrective action --------------------------------------------------------------- 1 2. Corrective action when the orange LED blinks ---------------------------------------------------- 6 3.

  • Page 2: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. Troubleshooting and corrective action Possible cause Problem Inspection method Corrective action (*: Most common cause) <Nails> Nails • Magazine is not loaded with • Check whether the • Use specified nails. cannot be specified nails. magazine is correctly •...
  • 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 24. driven but rack •...
  • Page 4 Possible cause Problem Inspection method Corrective action (*: Most common cause) • Piston slide surface trouble • Check the surfaces on • Replace defective Nails jam. (e.g., galling, break) which the piston slides parts. (blade guides (A) and (B) and pushing levers (A) and (B)).
  • 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 should operation be 9 or more remaining nails. without motor *•...
  • Page 6 • Use a fully charged battery • Charge or replace the and check the nailing work battery. again. For New Zealand and NR 1890DCA(S) For others Select the nailing operation mode. Select the nailing operation mode. (Full sequential actuation only)

  • 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 blade 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 the nailer to the MAINTENANCE mode, hold down both the nailing operation switch and the power switch on the operation panel for at least five seconds. Fig.

  • Page 9: Resetting Error Mode (When The Orange Led Is Blinking)

    5. Resetting error mode (when the orange LED is blinking) Error indication: Indicated by the orange misalignment indicator blinking (at intervals of 0.5 second). The power indicator turns off automatically 10 seconds later. To reset the mode: Hold down both the misalignment clear switch and the nailing operation switch for at least five seconds.

  • Page 10: Repair Guide

    1. Precautions on disassembly and reassembly [Bold] numbers in the description below correspond to the item numbers in the parts list and exploded assembly diagram for the Models NR 1890DCA and NR 1890DCA(S), and (Bold) numbers to those for the Model NR 1890DRA.

  • Page 11: Disassembly And Reassembly Of The Magazine Section

    • Remove the Nylock Bolt (W/Flange) M6 x 10 [94], Distance Piece (C) [95], and Magazine Rubber [96]. Then remove Blade Guide (B) [100]. • Remove the Nail Feeder [106], Ribbon Spring [107], Needle Roller [108], and Nail Rail [105]. Fig. 5 • Models NR 1890DCA and NR 1890DCA(S) [88] [89]...
  • Page 12 (2) Model NR 1890DRA • Remove the Torx Flange Button Bolt M6 x 12 (109) that fastens the Magazine Ass'y (88) to the Housing Set (69) and two Torx Flange Bolts M5 x 22 (43) that fasten the Magazine Ass'y (88) to the Nose (21). •...
  • Page 13 2. Reassembly (1) Models NR 1890DCA and NR 1890DCA(S) Reverse the disassembly procedure to reassemble. Note the following points: • Insert the protrusion of the Nail Rail [105] into the nail head inlet of Blade Guide (B) [100]. Fig. 7...

  • Page 14: Disassembly And Reassembly Of The Output Section

    Disassembly and reassembly of the output section 1. Removal of the power assembly and wiring ass’y • Housing Set [69](69) consists of two halves: housing (A) with the “BRUSHLESS” logo mark and housing (B). • For safety, push the Valve Core [7](7) once more and check that compressed air is completely released. •...
  • Page 15 2. Disassembly of the power assembly NOTE: • See pages 24 to 25 for replacement of only the Piston Ass'y [15](15). • Make alignment marks on the Chamber Base [13](13) and Cylinder [10](10) as shown in the figure below so as to indicate the coupling positions before disassembling the power assembly.
  • Page 16 • Remove the Valve Core [7](7) from the Chamber Base [13](13) by using a commercial valve core tool. (See Fig. 11.) Fig. 11 Bit type Tip shape • Remove the four Nylock Bolts M6 [14](14) that fasten the Chamber Base [13](13) and Chamber Cover [8](8), and remove the Chamber Base [13](13).
  • Page 17 Fig. 15 J-421 Repair tool number "J-421" Fit the claws of the J-421 special socket Hold the Nose [21](21) with a vise. in the notches on the Cylinder [10](10). Loosen the Cylinder [10](10) using a socket wrench. • Remove the Chamber Base [13](13) from the Cylinder [10](10) being careful not to damage the sealing surfaces.
  • Page 18 • Remove the Special Bolt M6 [45](45), Pushing Lever (B) [46](46), Adjuster Spring [48](48), and Steel Ball D3.175 [47](47) from the Adjuster [49](49). • Remove the two Nylock Bolts (W/Flange) M4 x 14 [42](42) and one Nylock Bolt (W/Flange) M4 x 20 [40](40) from the Nose [21](21), then remove Blade Guide (A) [98](98).
  • Page 19 CAUTION: Be sure to turn the Cylinder [10](10) in the loosening direction to adjust the position. If it is turned in the tightening direction forcedly to adjust to the closest screw hole, the Cylinder [10](10) may be damaged. Fig. 18 •...
  • Page 20 • Mount Pin (B) [30](30) and Pin (C) [32](32) to the Pin Wheel [31](31) as shown below. Fig. 21 • How to attach Pin (C) [32](32) • How to attach Pin (B) [30](30) [32](32) O-ring [30](30) O-ring [31](31) [31](31) • Mount Wheel Spring (A) [28](28), Wheel Spring (B) [34](34), Wheel Spring (C) [35](35), and Wheel Spring (D) [27](27) to the Pin Wheel [31](31) as shown below.
  • Page 21 • Align the notch on the Pin Wheel [31](31) with the rack of the Piston Ass'y [15](15) and insert the Pin Wheel [31](31) into the Nose [21](21). Fig. 24 [21](21) Notch on the Pin Wheel [31](31) [15](15) • Insert the two Magnet Holders [81](81) and Magnets (A) [79](79) into the Slider [80](80).Then put the Slider [80](80) in the Nose [21](21) as shown in Fig.
  • Page 22 • Be sure to mount Bumper (B) [72](72) to the Nose [21](21) as shown in Fig. 27 and then mount the Gear Box Ass’y [70](70). Fig. 27 [72](72) • If it is difficult to mount the Gear Box Ass’y [70](70) due to improperly meshed gears, turn the Rotor [71](71) by hand so that the gears are properly meshed.
  • Page 23 • Check that the internal wires are not caught and there is no clearance between housings (A) and (B) when putting housing (A) and housing (B) together. Fig. 29 • After reassembly, check that the terminal of the Wiring Ass’y [60](60) is properly mounted without mismatch and it is slightly movable as shown in Fig.
  • Page 24 4. Checking after reassembly of the power assembly • Check that Pushing Lever (A) [51](51) moves smoothly without any catch. • Check that the Adjuster [49](49) rotates smoothly. • Connect Sensor (B) [41](41) and Sensor (C) [82](82) to the Wiring Ass’y [60](60) and then connect the terminal to the battery as shown in Fig.

  • Page 25: Replacement Of The Piston Ass'y

    Replacement of the piston ass'y 1. Disassembly • Remove the Magazine Ass'y [88](88) and Top Cover [3](3) to take out the power assembly and the Wiring Ass’y [60](60) referring to pages 10 to 12. [1](1) Fig. 33 [2](2) [3](3) [4](4) [5](5) [6](6) [7](7)
  • Page 26 • Check that compressed air is completely released. Then remove the four Nylock Bolts M6 [14](14) from the Chamber Base [13](13) and Chamber Cover [8](8) to remove the Chamber Cover [8](8). NOTE: If it is difficult to remove the Chamber Base [13](13), temporarily tighten at least two Nylock Bolts M6 [14](14) so that the threaded portion is shown 3.5 mm to 6.5 mm as shown in Fig.

  • Page 27: Replacement Of Sensor (B) And Sensor (C)

    Replacement of sensor (B) and sensor (C) • Remove the Magazine Ass'y [88](88) and Top Cover [3](3) to take out the power assembly referring to pages 10 to 12. • Pull out the Roll Pin D2.5 x 25 [76](76), Roll Pin D2.5 x 16 [77](77), and two Roll Pins D2.5 x 8 [75](75) protruding from the Nose [21](21) with nippers as shown in Fig.

  • Page 28: Feeding Compressed Air

    • Prepare the J-417 reduction valve set specified below. Model name Model Repair tool number Preset feeding pressure indicated on label NR 1890DCA/DCA(S) NR 1890DRA 0.87 ± 0.03 MPa J-417 (Code No. 382540) NR 1890DRA NR 1890DCA (8.9 ± 0.3 kgf/cm Fig.
  • Page 29 • Push the Valve Core [7](7) 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 [13](13). Fig.

  • Page 30: Checking After Reassembly

    (air leak check). Tightening torque Item No. Tightening torque Part name NR 1890DCA NR 1890DRA N•m lbf-ft NR 1890DCA(S) Hex. Socket Bolt M5 5.9 ±...

  • Page 31: Connecting Diagram

    Connecting diagram Fig. 43 -30-...

  • Page 32: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Repair Model time 60 min. NR 1890DCA Work Flow NR 1890DRA Adjuster Pushing Lever (A) Pushing Lever (B) Pin Wheel General Assembly Chamber Blade Top Cover Hook Cover Guide (A) Chamber Nose Pushing Base Lever...

This manual is also suitable for:

Nr 1890draNr 1890dcas

Table of Contents