Makita DTW300 Repair Manual
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Makita DTW300 Repair Manual

Makita DTW300 Repair Manual

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OFFICIAL USE
For ASC
CORDLESS IMPACT WRENCH
DTW300/DTW301
REPAIR MANUAL
April 2020
Ver.1

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Summary of Contents for Makita DTW300

  • Page 1 OFFICIAL USE For ASC CORDLESS IMPACT WRENCH DTW300/DTW301 REPAIR MANUAL April 2020 Ver.1...

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................................2 CAUTION ....................................3 NECESSARY REPAIRING TOOLS ............................3 LUBRICANT AND ADHESIVE APPLICATION ........................4 TIGHTENING TORQUE SPECIFICATIONS ..........................4 REPAIR ......................................5 Rotor, Hammer case section ..............................5 6-1-1 Disassembling ................................5 6-1-2 Assembling .................................. 8 Hammer section .................................

  • Page 3: Caution

    CAUTION Repair the machine in accordance with “Instruction manual” or “Safety instructions”. Follow the instructions described below in advance before repairing:  Wear gloves.  In order to avoid wrong reassembly, draw or write down where and how the parts are assembled, and what the parts are. It is also recommended to have boxes ready to keep disassembled parts by group.

  • Page 4: Lubricant And Adhesive Application

    Apply a little amount unless specified in the figure.  Outer surface groove [1] Makita grease FA No.2  Inner surface groove [2]  Contact surface with Steel ball 3.5 [3] This bolt is a thread lock type fastener with a coating of adhesive.

  • Page 5: Repair

    REPAIR Rotor, Hammer case section 6-1-1 Disassembling Fig.2 For removing Anvil E [1], support it with 1R274 or the like, then spread and apply the claws of 1R004 to the ends of Ring spring 10 [2]. And then remove the ring by tapping the end of the handle of 1R004 1R004 with a plastic hammer [3].
  • Page 6 Fig.3 Remove Tapping screws bind PT 3x16 [1] (2 pcs), then remove Rear cover [3] from Housing [2]. Fig.4 Hold Anvil [1] in 1R082. Insert two slotted screwdrivers [2] into the clearance between the blades of Fan, and pull out Rotor [3] together with the screwdrivers.
  • Page 7 Fig.6 Remove one claw [3] of Hammer case cover from the groove of Hammer case [2] with a thin slotted screwdriver [1]. Then remove the other claw the same way, and then remove Hammer case cover [5] from Hammer case [4]. Note Be careful not to scratch Hammer case [4] with a thin slotted screwdriver [1].

  • Page 8: Assembling

    Fig.10 Remove Tapping screws bind PT 3x16 [1] (8 pcs), then remove Housing R [3] from Housing L [2]. Note Be careful not to allow Rubber pin 5 [4] and Pin 1.5 [5] to fall off Housing L [2]. Switch and Stator can be replaced. 6-1-2 Assembling Fig.11...
  • Page 9 Fig.13 Fasten Housing R [2] to Housing L [1] with Tapping screws bind PT 3x16 [3] (8 pcs). Note  Make sure that Rubber pin 4 [4] is assembled to Housing R [2].  Before fastening Housing R [2], make sure that: ...
  • Page 10 Fig.16 Position the U-shaped notch of Hammer case cover [1] on the LED circuit side [2], then assemble it to Hammer case [3]. Tips Be sure to fit the two claws [4] of Hammer case cover into the two grooves [5] of Hammer case. Fig.17 Fit the two protrusions [1] of Bumper into the two grooves of Hammer case cover [2].
  • Page 11 Fig.19 Assemble Rear cover [2] to Housing [1] with Tapping screws 3x16 [3] (2 pcs). Fig.20 In the case of Anvil E [1], first spread a brand-new Ring spring 10 [2] with 1R004 or the like. Then set the ends of Ring spring 10 [2] in the 1R004 groove of Anvil E [3], and then press-fit the ring onto the anvil with water pump pliers [4] or the like...

  • Page 12: Hammer Section

    Hammer section 6-2-1 Disassembling Disassemble Hammer section. (6-1-1) Tips It is not necessary to disassemble the front end of Anvil and remove it from Hammer case. Fig.21 Remove Pins 5 [2] (3 pcs) from Spindle [1], then remove Spur gears 22 [3] (3 pcs). Fig.22 Set the claws of 1R045 in the position [1], then set 1R045 on Hammer [2], and then hold the claws by...
  • Page 13 Fig.23 Pull down [2] Hammer [1] by turning the handle of 1R045 clockwise. Pull down Hammer [1] fully, then turn the handle counterclockwise to raise Hammer until the top of the cam groove of Spindle [3] is aligned with the opening [4] of Hammer.

  • Page 14: Assembling

    6-2-2 Assembling Assemble by reversing the disassembling procedure. (6-2-1) Fig.27 Assemble the following parts to Hammer [1]:  Steel balls 3.5 [2] (24 pcs)  Flat washer 24 [3]  Compression spring 25 [4]  Steel balls 5.6 [5] (2 pcs) [12] ...

  • Page 15: Assembling

    Fig.29 Remove O ring 49 [2] from Internal gear case [1]. Insert a slotted screwdriver [4] into the groove [3] of Internal gear case, then, while holding Spring 43 [5] with your finger, pry it off by pushing in the direction of the arrow [6].

  • Page 16: Circuit Diagram

    CIRCUIT DIAGRAM Fig.32 Color index of lead wires' sheath White Gray Blue Green Yellow Orange Black AWG16 Rotor rotation detector AWG22 LED circuit AWG22 (if Lead unit is used) Switch AWG28 Terminal unit Connector Controller Straight receptacle with lock (#250, t=0.8) Terminal Flag receptacle with lock (#250, t=0.8) Earth plate...

  • Page 17: Wiring Diagram

    WIRING DIAGRAM The difference in types of Controller Fig.33 Terminal for Stator Controller without Tape Without Tape Controller with Tape With Tape There are two types of Lead wires for Stator on Controller. The one is bound with Tape and the other is without Tape, and they are different in wiring.

  • Page 18: Led Circuit

    8-1-1-1 LED circuit Fig.35 Rib A Rib C Rib B LED circuit Fix Lead wire of LED circuit in this Lead wire holder. Be careful not to slack Lead wires of LED circuit in this area. Route Lead wires of LED circuit between Rib A and Rib B/ Rib A and Rib C. 8-1-1-2 Lead unit Fig.36 Internal gear case...

  • Page 19: Housing Section

    8-1-1-4 Housing section Fig.38 Boss A Switch Rib C Controller Rib D Terminal Rib E Section A-A Connector A Range of Boss A Connector B Lead wire (Blue) of Stator Stator Lead wire (White) of Stator Printed wiring board Lead wire of Printed wiring board Lead unit (if used) Lead wire (Orange) of Stator LED circuit...

  • Page 20: Controller Whose Lead Wires Of Terminal For Stator Are Bound With Tape

    8-1-2 Controller whose lead wires of Terminal for Stator are bound with Tape 8-1-2-1 LED circuit Fig.39 Rib A Rib C Rib B LED circuit Fix Lead wires of LED circuit in this Lead wire holder. Be careful not to slack Lead wires of LED circuit in this area. Route Lead wires of LED circuit between Rib A and Rib B/ Rib A and Rib C.

  • Page 21: Housing Section

    8-1-2-4 Housing section Fig.42 Rib C Lead unit (if used) Rib D LED circuit Rib E Switch Connector A Controller Connector B Terminal Stator Route the following Lead wires between Rib D and Rib C, Rib D and Rib E ...

  • Page 22: Troubleshooting

    TROUBLESHOOTING Whenever you find any trouble in your machine, first, see this list to check the machine for solution. Note for Repairing The content may vary depending on the model. Use a full charged battery which has a star mark. When Housing is disassembled, check the conditions of each section (ex.
  • Page 23 1R402-B Tips By attaching 1R402-B to each probe of 1R402, you can make your hands free for easier check. Note Be careful not to reverse them. The reversed contacts could spoil the test. 1R402-B Wait until the figure on Tester gets stable. Controller is in order if Tester indicates 0.8±0.1V.

  • Page 24: Flowchart For Troubleshooting

    Flowchart for Troubleshooting Check the items in the following flowchart in order from the top to bottom. (Description of the item is referred to CIRCUIT DIAGRAM. (Fig.32) After corrective action, return to the start of Troubleshooting and re-check again. Symptom Cause Corrective action Tester indicates proper figure.
  • Page 25 (Continued from previous page) Lead wires are broken. Check Lead wires or replace them. LED job light LED circuit is broken. Replace LED circuit. lights up. Switch is broken. Replace Switch. Rub marks on Controller is broken. Replace Controller. Rotor. Iron powder is attached.

This manual is also suitable for:

Dtw301

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