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[3] DISASSEMBLY/ASSEMBLY
[3] -1. Keyless Drill Chuck

DISASSEMBLING

ASSEMBLING

1) Turn Keyless drill chuck clockwise until it sits on the end of the threaded portion of spindle of Gear ass’y.
2) Hold the short leg of Hex wrench 8 with Keyless drill chuck, and fix the long leg of Hex wrench 8 in vise. Install Battery.
     Then set Action mode change lever of machine in Drill mode, Speed change lever in Low speed, and F/R change lever 
     in Forward rotation mode.
3) Slowly pull the switch trigger to rotate spindle until the motor is locked.
    Important: Be sure to release the switch trigger just after Spindle is locked. 
4) Secure Keyless drill chuck with M6x22 - Flat head screw by turning counterclockwise using cordless impact driver with
     slotted bit.
    Note: If you reuse the removed M6x22 - Flat head screw, apply threadlocker (ThreeBond 1321B/ 1342 or Loctite 242) to 
              the threaded portion. 

Fig. 1

[1] NECESSARY REPAIRING TOOLS

CAUTION: 

Remove the battery and the bit from the machine for safety before repair/ maintenance!

Description

Use for

Hex wrench 8

Removing /mounting Keylss drill chuck

Plastic hammer

Removing Keyless drill chuck

Note: (1) It is required to remove Keyless drill chuck at first when replacing 
                Gear ass’y.
                When parts other than Gear ass’y are related to repair, 
                 removing Keyless drill chuck is not required.
          (2)  If it is impossible to remove Keyless drill chuck in the following 
                 manner, use 1R359 (Chuck removing tool) to remove it. Refer to 
                 Makita repair tool list.    

1) Open the jaws of Keyless drill chuck fully, and remove M6x22 - Flat head 
    screw (left-handed and threadlocker coated) by turning clockwise using 
    cordless impact driver in Forward rotation mode with slotted bit.
2) Fix the short leg of a hex wrench 8 in Keyless drill chuck, then clamp the 
    long leg of the Hex wrench 8 securely in vise.
3) Set Action mode change lever of the machine in Drill mode, Speed change
    lever in Low speed, and F/R change lever in Reverse rotation mode.
4) Install Battery and hold the machine securely with both hands, then remove
    Keyless drill chuck from Gear ass’y by pulling Switch trigger slowly 
    to minimize the impact of kickback.  (Fig. 1)

Note: Clamp the flats of Hex 
          wrench 8 securely in vise. 

[2] LUBRICATION

It is not required to lubricate the gear section. Use Makita genuine Gear assembly that is factory-lubricated when repairing.

Important:
The machine rotates in the direction of the arrow with very strong force at 
the moment when Switch trigger is pulled. 
Therefore, be careful not to pinch your hand or finger between the machine 
and the vise.

Summary of Contents for BHP453

Page 1: ...untries of North America and Latin America 2 for other countries 3 with Battery BL1815 4 with Battery BL1830 Makita blue Makita blue Makita blue white Housing color BHP453Z No No No No UK Battery Capacity of drill chuck mm Lock torque N m in lbs Electric brake Variable speed control Mechanical speed control Reverse switch Max fastening torque N m Torque setting Soft joint Hard joint No load speed ...

Page 2: ...rill chuck at first when replacing Gear ass y When parts other than Gear ass y are related to repair removing Keyless drill chuck is not required 2 If it is impossible to remove Keyless drill chuck in the following manner use 1R359 Chuck removing tool to remove it Refer to Makita repair tool list 1 Open the jaws of Keyless drill chuck fully and remove M6x22 Flat head screw left handed and threadlo...

Page 3: ...ss y from Gear ass y Gear ass y Remove Gear ass y Speed change lever ass y and DC motor with Switch from Housing set L as illustrated above Disassemble Housing set R by removing Bind PT3x16 tapping screws 9 pcs Pull off Gear ass y while turning it clockwise viewed from DC motor side Now Gear ass y can be replaced Motor bracket Motor bracket Remove DC motor with Cap from Motor bracket by removing M...

Page 4: ...g Speed change lever ass y make sure that Compression springs 4 2 pcs are assembled to its bottom in advance Fig 8 2 Fit the protrusion of Gear ass y into Compression spring 4 in Speed change lever ass y Fig 9 3 After mounting set Speed change lever ass y to low speed mode or high speed mode Fig 10 Motor bracket DC motor Cap Note Be sure to Cover the center of DC motor with Cap none of protrusion ...

Page 5: ...eaf spring has to be mounted to Housing set L as illustrated in Fig 11 before assembling Gear ass y and DC motor F R Change lever can be assembled to Switch as illustrated in Fig 12 ASSEMBLING ASSEMBLING Fig 12 Fig 11 Leaf spring 3 5 F R Change Lever 3 6 Cushion Fig 13R Fig 19F Be sure to install Cushion into Housing set L as illustrated in Fig 13R Note Fig 13F is the wrong installation Pay attent...

Page 6: ...Connect Lead wires with each terminals as illustrated above Circuit diagram Fig D 1 Color index of lead wire s sheath Black Red Switch DC motor Terminal Red marking for distinction of plus pole has to be at upper position Fix lead wires with lead wire holders DC motor Cap Gear ass y Switch Terminal ...

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