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9. REPAIR GUIDE
WARNING: Without fail, remove the Model EB 9B or EB 9H Battery from the main body before starting
repair or maintenance work. Because the tool is cordless, if the battery is left in and the
switch is activated inadvertently, the motor will start rotating unexpectedly, which could
cause serious injury.
9-1. Precautions in Disassembly and Reassembly
The [bold] and <bold> numbers correspond to the item numbers in the Parts List and the exploded assembly
diagram. ( [ ]: WH 8DH, < >: WR 8DH )
9-1-1. Disassembly
(1) Removal of the Hammer Case [6] <2> and the Inner Cover [21] <19>
Remove the four Tapping Screws D4 x 30 [5] <1> that connect the Hammer Case [6] <2> with the Housing
(A).(B) Set [28] <26>. Remove the Hammer Case [6] <2>, the Inner Cover [21] <19> and the Damper [22]
<20> together from the Housing (A).(B) Set [28] <26>.
(2) Removal of Housing (B)
Remove the seven Tapping Screws D4 x 20 [26] <24> from the main body to remove Housing (B).
(3) Remove the DC-Speed Control Switch [30] <28>, Fin Ass'y [32] <30>, Motor [23] [21], Grip (F) [33] <31> and
Grip (R) [37] <35> together. Remove the Pushing Button [31] <29> and the Strap [35] <33>.
(4) Disassembly of the switch ass'y
Remove the two Machine Screws M3 x 5 [29] <27> that secure the flag terminal and then disconnect the
internal wires (purple and black) of the Motor [23] <21> from the DC-Speed Control Switch [30] <28>.
Remove the S-Tight Screw D3.5 x 6 [36] <34> to remove the Fin Ass'y [32] <30> from the FET of the DC-
Speed Control Switch .
(Note) Do not disconnect the three FET internal wires soldered to the DC-Speed Control Switch.
(5) Removal of the Guide Sleeve [4] (for WH 8DH only)
By following the procedure shown in Figs. 9-1 to 9-4, you can remove the Retaining Ring [1], Washer (D) [2],
Guide Spring [3] and Guide Sleeve [4] in this order. Be sure not to lose the Steel Ball D3.5 [7] in Anvil (B) [8].
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