Hitachi NR 1890DBCL Service Manual Download

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-23-

Fig. 27

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

• Remove Housing (C)

[45](45)

, magazine ass'y, and Top Cover

[2](2)

to take out the power assembly and

Wiring

[51](51)

referring to pages 8 to 12.

Replacement of the piston ass'y

[1](1)

[2](2)

[3](3)

[4](4)

[5](5)

[6](6)

[7](7)

[9](9)

[11](11)

[12](12)

[13](13)

[8](8)

[14](14)

[13](13)

[16](16)

[17](17)

[18](18)

[19](19)

[29](29)

[27](27)

[20](20)

[26](26)

[10](10)

[34](34)

[35](35)

[33](33)

[36](36)

[32](32)

[31](31)

[30](30)

[37](37)

[21](21)

[23](23)

[24](24)

[25](25)

[38](38)

[39](39)

[40](40)

[41](41)

[42](42)

[68](68)

[69](69)

[18](18)

[66](66)

[64](81)

[65](82)

[60](60)

[61](61)

[63](63)

[22](22)

[28](28)

[15](15)

[67](67)

Summary of Contents for NR 1890DBCL

Page 1: ...cautions 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 CONTENTS CONFIDENTIAL ...

Page 2: ...guide B Step in the nail shank guide groove between blade guide B and magazine Nail guide groove of the magazine too narrow or wide Nail guide groove trouble deformation or burring of the magazine Load nails in the nailer and make sure the nailer works normally Unwanted objects e g dust wood dust adhesives in the nail guide groove of blade guide B magazine and nail feeder Load nails in the nailer ...

Page 3: ...e lifted This nailer is not for hard wood Weak thrusting force against wood to be nailed Firmly thrust the nailer against wood to be nailed and start nailing Check whether the nail heads are still lifted Follow the nailer operation guide Deformed output section Check the nail guide groove of the pushing lever and blade guide for any trouble e g deformation excessive wear burrs Replace defective pa...

Page 4: ...e of the magazine and nail feeder Load nails in the nailer and check that the nailer works normally Remove unwanted objects e g dust wood dust adhesives Deformed output section Check pushing lever A and blade guides A and B for deformation excessive wear and burrs Replace defective parts Misaligned assembly of blade guide B and magazine Set Hitachi genuine nails in the nailer and lightly push them...

Page 5: ...r probes to the points shown in the figure below Make sure the terminals are not electrically connected Set the switch to ON and apply tester probes to the points shown in the figure below Make sure the terminals are electrically connected 2 When the microswitch is not defective Set the switch to ON and apply tester probes to the points shown in the figure below Make sure the contacts are electric...

Page 6: ...ly check the sensor wires for breaks Replace defective parts Excessively charged compressed air Check the LED lighting pattern Move the piston down to the bottom dead point Discharge the compressed air Use the reduction valve set to feed compressed air again See pages 27 to 28 8 No nailing operation with the red 2 LEDs blinking Overheat protector is activated Cool the nailer body and check the nai...

Page 7: ...t 7 to 8 seconds Lock by broken gear Lock by worn out piston rack Lock by broken piston bumper Broken wiring Replace defective parts 5 Power switch is automatically turned off after about 9 seconds Excessively charged compressed air Deformed or broken moving parts Moving parts are out of grease Replace defective parts Move the piston down to the bottom dead point Discharge the compressed air Use t...

Page 8: ...tact actuation mode at intervals of 1 0 second Function Starts the motor when the pushing lever is pressed against wood and the trigger is pulled Stops the motor when detecting two motor rotations 4 Resetting error mode when the orange LED is blinking Error indication Indicated by the orange battery level indicators blinking at intervals of 0 5 second The power indicator turns off automatically 10...

Page 9: ...maintenance work Because the tool is cordless inadvertently activating the switch with the battery left in the main body will start the motor rotating unexpectedly and could cause serious injury 1 Removal of the hook Remove the Hook 57 57 by removing the Low Head Hex Socket Bolts M4 x 8 58 58 for easy disassembly work although disassembly can be done without removing the Hook 57 57 2 Removal of ho...

Page 10: ...d 90 from the magazine ass y and remove Magazine Cover B 84 from Magazine Cover A 88 Then remove Blade Guide B 76 Remove the Tapping Screw D5 x 20 93 that fastens Magazine Cover A 88 to Nail Feeder B 79 Then remove the Feeder Knob 92 and Ribbon Spring 80 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 Co...

Page 11: ...emove the Magazine Guard 90 from the magazine ass y and remove Magazine Cover B 84 from Magazine Cover A 88 Then remove Blade Guide B 76 Remove the Tapping Screw D5 x 20 93 that fastens Magazine Cover A 88 to Nail Feeder B 79 Then remove the Feeder Knob 92 and Ribbon Spring 80 Remove Pushing Lever Stopper A 72 Pushing Lever Stopper B 74 and two Springs 73 from Magazine Cover A 88 Remove Nail Rail ...

Page 12: ...the disassembly procedure to reassemble Note the following points Position the concave portion of Blade Guide B 76 on Magazine Cover B 84 side between the Magazine Plate 85 and Magazine Cover B 84 as shown below Insert the protrusion of Nail Rail C 87 into the nail head inlet of Blade Guide B 76 Nail head inlet of blade guide B Protrusion of the nail rail Fig 6 Fig 8 Concave portion of blade guide...

Page 13: ...nnect the connectors of Sensor B 63 63 Sensor C 60 60 Switch Cable A 52 52 and Wiring 51 51 Remove the two O rings I D 2 5 50 50 from Switch Cable A 52 52 Be careful not to lose the O rings Carefully lift the Chamber Base 10 10 and Nose 17 17 to remove the power assembly from housing A and Rotor 83 83 Remove the Gear Box 82 82 and Bumper B 59 59 from the power assembly Firmly hold the stator of th...

Page 14: ... so as to indicate the coupling positions before disassembling the power assembly Fig 10 1 1 2 2 3 3 4 4 5 5 6 6 7 7 9 9 11 11 12 12 13 13 8 8 14 14 13 13 16 16 17 17 18 18 19 19 29 29 28 28 27 27 20 20 26 26 10 10 34 34 35 35 33 33 36 36 32 32 31 31 30 30 37 37 15 15 21 21 22 22 23 23 24 24 25 25 38 38 39 39 40 40 41 41 42 42 68 68 69 69 18 18 67 67 66 66 63 63 64 81 65 82 61 61 60 60 Alignment m...

Page 15: ...ction valve set and feed compressed air to remove the Chamber Base 10 10 Remove the O ring I D 94 5 7 7 from the Chamber Base 10 10 Push in the Piston Ass y 15 15 from Blade Guide A 70 70 side to the Cylinder 5 5 side to remove it Remove the Hex Socket Hd Bolt M5 64 64 from the Nose 17 17 Move the Chamber Base 10 10 from the Cylinder 5 5 contact surface to the Nose 17 17 side and secure the Cylind...

Page 16: ...he Nose 17 17 and pull out the Bearing Holder 22 22 and Pin Wheel 27 27 NOTE The Pin Wheel 27 27 can be removed only after removing the Piston Ass y 15 15 Remove the Ball Bearing 6000VV 23 23 and Ball Bearing 6902VV 29 29 from the Pin Wheel 27 27 Remove the Needle Roller D3 30 30 from the Pin Wheel 27 27 and then remove the Position Detector 25 25 Remove the eight Needle Rollers D4 32 32 and one N...

Page 17: ...nt marks made before disassembly for precise positioning when mounting the Chamber Base 10 10 on the Cylinder 5 5 Slowly tighten the four Nylock Bolts M6 11 11 to fasten the Chamber Base 10 10 and Chamber Cover 4 4 Be careful not to pinch and damage the O ring I D 94 5 7 7 Impregnate Felt P 20 20 with about 1 g of Molub Alloy 777 1 grease by hand before reassembly Mount the Pin Wheel 27 27 to the ...

Page 18: ... 17 17 to the Cylinder 5 5 in this order Apply Three Bond TB1342H adhesive in the form of a line circling around the cylinder two times as shown in Fig 18 Then mount the Special Nut M58 12 12 Mount Sensor B 63 63 using a round bar of 2 to 2 5 mm in diameter as shown in Fig 19 to protect the root of the wire from being applied force After mounting Sensor B 63 63 remove the round bar Round bar Remov...

Page 19: ... to mount the Hex Socket Hd Bolt M5 64 64 to the Nose 17 17 Insert the Rotor 83 83 into the Gear Box 82 82 and check that the Rotor 83 83 turns smoothly by hand as shown in Fig 21 NOTE If the Rotor 83 83 cannot turn smoothly the gear may be deformed or damaged Replace the Gear Box 82 82 with new one Be sure to mount Bumper B 59 59 to the Nose 17 17 as shown in Fig 22 and then mount the Gear Box 82...

Page 20: ...using A of Housing Set 46 46 with a flat blade screwdriver being careful not to damage the coating as shown in Fig 22 Do not protrude the wires Do not pinch the wires Do not protrude the wires Sensor C Black blue red Sensor B Black white red Black blue red Black white red Ferrite core Models NR 1890DBCL and NR 1890DBRL only Ferrite core Models NR 1890DBCL and NR 1890DBRL only ...

Page 21: ...ught and there is no clearance between housings A and B when putting housing A and housing B together 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 24 51 51 ...

Page 22: ...hly 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 25 in order to check Sensor B 63 63 for normal response Operation panel Power switch Battery 51 51 Operation panel ...

Page 23: ...ht on the operation panel remains turned off See Fig 26 NOTE If a pin punch of 5 0 1 mm 0 2 0 0039 in diameter and a pin punch of 2 4 0 1 mm 0 095 0 0039 in diameter are not available use the shank of a drill of 5 mm in diameter and a drill of 2 4 mm in diameter If the LED light remains turned off when inserting a pin punch of 5 mm in diameter during the operation check of Sensor B 63 63 or if the...

Page 24: ... magazine ass y and Top Cover 2 2 to take out the power assembly and Wiring 51 51 referring to pages 8 to 12 Replacement of the piston ass y 1 1 2 2 3 3 4 4 5 5 6 6 7 7 9 9 11 11 12 12 13 13 8 8 14 14 13 13 16 16 17 17 18 18 19 19 29 29 27 27 20 20 26 26 10 10 34 34 35 35 33 33 36 36 32 32 31 31 30 30 37 37 21 21 23 23 24 24 25 25 38 38 39 39 40 40 41 41 42 42 68 68 69 69 18 18 66 66 64 81 65 82 6...

Page 25: ...se 17 17 and pull out the Bearing Holder 22 22 and Pin Wheel 27 27 Remove the Ball Bearing 6000VV 23 23 from the Pin Wheel 27 27 Remove the Needle Roller D3 30 30 from the Pin Wheel 27 27 Then remove the Position Detector 25 25 Remove the Needle Roller D4 5 26 26 from the Pin Wheel 27 27 See Fig 29 2 Reassembly Reverse the disassembly procedure to reassemble Note the following points Use the speci...

Page 26: ... 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 31 Apply about 1 5 g of Isoflex Topas NB52 grease to the inside of the Cylinder 5 5 evenly NOTE If the Position Detector 25 25 is not precisely located an error causing the orange LED of the battery indicator to blink may...

Page 27: ...ll Pin D2 5 66 66 and Roll Pin D2 5 x 16 67 67 protruding from the Nose 17 17 with nippers as shown in Fig 32 Remove Sensor B 63 63 from the Nose 17 17 Mount new Sensor B 63 63 to the Nose 17 17 and then mount the Roll Pin D2 5 66 66 as shown in Fig 33 A Hold the roll pin with the blade edges of nippers Pressing against the end surface of the nose move the nippers in A direction to pull out the ro...

Page 28: ...int 1 Move the Feeder Knob 92 92 down to reset the dry fire lockout mechanism 2 Press Pushing Lever A 42 42 against a piece of wood 3 Pull the Trigger 54 54 Check that the driver blade of the Piston Ass y 15 15 protrudes from the blade guide 2 Feeding compressed air Check that the battery is not mounted in the nailer body Prepare the J 394 reduction valve set 16 GA specified below Model Model name...

Page 29: ...re an air compressor 0 7 MPa or higher and set a delivery pressure of 0 7 to 1 2 MPa See Fig 37 Connect the reduction valve set to the air compressor for at least 10 seconds to feed compressed air See Fig 38 Reverse the procedure above for disconnection Quickly mount the Charge Cap 8 8 on the feeding port within 30 seconds after feeding compressed air to prevent air leaks from the valve section Be...

Page 30: ... and start nailing Check that no trouble e g abnormal nailing unusual sound nail head lift occurs Press Pushing Lever A 42 42 without pulling the Trigger 54 54 in the contact actuation mode and make sure the nailer does not work After checking the actual nailing check the position in readiness according to the following procedure Measure the distance between the tip of Blade Guide A 70 70 and the ...

Page 31: ...ange M4 3 4 0 7 2 5 0 5 34 85 34 86 Nylock Bolt W Flange M5 6 9 0 5 5 1 0 5 37 37 Special Bolt M6 12 7 0 8 9 4 0 6 44 44 Tapping Screw W Flange D4 x 20 Black 2 0 0 5 1 5 0 2 58 58 Low Head Hex Socket Bolt M4 x 8 3 4 0 7 2 5 0 5 64 64 Hex Socket Hd Bolt M5 3 0 0 3 2 2 0 2 69 69 Nylock Hex Socket Hd Bolt M3 2 45 0 5 1 8 0 4 89 89 Step Bolt M3 1 7 0 17 1 2 0 1 91 91 Tapping Screw W Flange D4 x 16 Bla...

Page 32: ...r ass y B Sensor ass y C Battery terminal Main PCB ass y Tact switch PCB ass y Sensor PCB ass y M LD Black White Red 1 Red 2 Blue 3 Black 1 Red 2 White 3 Black Red Black White Alternative part Ferrite core Ferrite core Models NR 1890DBCL and NR 1890DBRL only Models NR 1890DBCL and NR 1890DBRL only ...

Page 33: ... Pushing Stopper Spring Feeder Knob Nail Feeder B Ribbon Spring Nail Feeder Pin Wheel Position Detector Chamber Cover Chamber Base Special Nut M58 O ring x 2 Cylinder Piston Blade Slide Ring X Ring Piston Bumper Housing Trigger Rotor Wiring Sensor C Gear Box Adjuster Pushing Lever A Pushing Lever B Magnet Blade Guide A Sensor B Nose Work Flow Top Cover Housing C Hook Pushing Lever Spring STANDARD ...

Page 34: ...5 6 12 20 7 8 9 11 10 14 13 15 16 19 17 25 26 27 28 29 504 21 22 23 24 30 32 31 33 34 35 36 37 38 39 40 41 42 67 44 45 43 44 46 53 54 50 52 50 48 47 51 55 56 57 58 83 63 18 84 85 86 87 77 78 79 80 88 70 71 76 75 73 73 72 74 89 90 91 92 93 501 501 61 66 505 502 503 506 64 18 13 60 65 68 69 81 62 59 82 49 ...

Page 35: ... I D 20 22 1 25 372327 POSITION DETECTOR 1 26 372326 NEEDLE ROLLER D4 5 1 27 372321 PIN WHEEL 1 28 372323 WHEEL SPRING B 1 29 6902VV BALL BEARING 6902VV 1 30 372328 NEEDLE ROLLER D3 1 31 372322 WHEEL SPRING A 1 32 372325 NEEDLE ROLLER D4 8 33 372324 PIN A 1 34 372355 NYLOCK BOLT W FLANGE M5 X 22 2 35 372311 NYLOCK BOLT W FLANGE M4 X 14 2 36 372307 PUSHING LEVER SPRING B 1 37 372316 SPECIAL BOLT M6...

Page 36: ...D BOLT M3 1 70 372309 BLADE GUIDE A 1 71 949685 ROLL PIN D3 X 20 10 PCS 1 72 372349 PUSHING LEVER STOPPER A 1 73 372350 SPRING 2 74 372351 PUSHING LEVER STOPPER B 1 75 883687 SPRING 1 76 372346 BLADE GUIDE B 1 77 885323 NAIL FEEDER A 1 78 949506 ROLL PIN D4 X 28 10 PCS 1 79 885324 NAIL FEEDER B 1 80 885325 RIBBON SPRING 1 81 372353 CAP NUT M3 1 82 372341 GEAR BOX 1 83 361071 ROTOR 1 84 372345 MAGA...

Page 37: ...CHARGER MODEL UC 18YFSL 1 502 943277 HEX BAR WRENCH 3MM 1 503 944458 HEX BAR WRENCH 4MM 1 504 875769 PROTECTIVE GLASSES 1 505 329897 BATTERY COVER 1 506 372294 TOOL BAG 1 4 Printed in Japan 7 17 170712N ALTERNATIVE PARTS STANDARD ACCESSORIES NO USED CODE NO ITEM NO ...

Page 38: ... 81 62 48 94 A 1 2 3 4 5 6 12 7 8 9 11 10 14 13 15 16 19 17 25 26 27 28 29 21 22 23 24 30 31 32 33 34 35 36 37 38 39 40 41 42 44 45 43 44 46 53 54 50 52 50 49 47 51 55 56 57 58 83 63 18 84 85 87 77 78 79 80 88 70 71 76 75 73 73 72 74 89 90 91 92 93 A 86 20 18 65 60 61 59 68 504 501 501 505 502 503 506 82 ...

Page 39: ... I D 20 22 1 25 372327 POSITION DETECTOR 1 26 372326 NEEDLE ROLLER D4 5 1 27 372321 PIN WHEEL 1 28 372323 WHEEL SPRING B 1 29 6902VV BALL BEARING 6902VV 1 30 372328 NEEDLE ROLLER D3 1 31 372322 WHEEL SPRING A 1 32 372325 NEEDLE ROLLER D4 8 33 372324 PIN A 1 34 372355 NYLOCK BOLT W FLANGE M5 X 22 2 35 372311 NYLOCK BOLT W FLANGE M4 X 14 2 36 372307 PUSHING LEVER SPRING B 1 37 372316 SPECIAL BOLT M6...

Page 40: ...371804 BLADE GUIDE A 1 71 949685 ROLL PIN D3 X 20 10 PCS 1 72 371809 PUSHING LEVER STOPPER A 1 73 372350 SPRING 2 74 372351 PUSHING LEVER STOPPER B 1 75 883687 SPRING 1 76 371805 BLADE GUIDE B 1 77 885621 NAIL FEEDER 1 78 949506 ROLL PIN D4 X 28 10 PCS 1 79 885324 NAIL FEEDER B 1 80 885325 RIBBON SPRING 1 81 372353 CAP NUT M3 1 82 372341 GEAR BOX 1 83 361071 ROTOR 1 84 371807 MAGAZINE COVER B 1 85...

Page 41: ...CHARGER MODEL UC 18YFSL 1 502 943277 HEX BAR WRENCH 3MM 1 503 944458 HEX BAR WRENCH 4MM 1 504 875769 PROTECTIVE GLASSES 1 505 329897 BATTERY COVER 1 506 372294 TOOL BAG 1 4 Printed in Japan 7 17 170712N ALTERNATIVE PARTS STANDARD ACCESSORIES NO USED CODE NO ITEM NO ...

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