Necessary Repairing Tools - Makita BHP453 Technical Information

R
epair
Remove the battery and the bit from the machine for safety before repair/ maintenance!
CAUTION:

[1] NECESSARY REPAIRING TOOLS

Description
Hex wrench 8 Removing /mounting Keylss drill chuck
Plastic hammer Removing Keyless drill chuck
[2] LUBRICATION
It is not required to lubricate the gear section. Use Makita genuine Gear assembly that is factory-lubricated when repairing.
[3] DISASSEMBLY/ASSEMBLY
[3] -1. Keyless Drill Chuck
DISASSEMBLING
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)
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.
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.
Use for
Fig. 1
Note: Clamp the flats of Hex
wrench 8 securely in vise.
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