Repair Guide; Precautions In Disassembly And Reassembly - Hitachi WH 12DAF2 Technical Data And Service Manual

Cordless impact driver and cordless impact wrench

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10. REPAIR GUIDE

WARNING: Without fail, remove the 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.

The [Bold] and <Bold> numbers correspond to the item numbers in the Parts List and the exploded assembly

diagram. ( [ ]: WH 12DAF2. < >: WR 12DAF2 )

10-1-1. Disassembly

(1) Removal of the Gear Box Ass'y [1] <1>

Remove the four Tapping Screws (W/Sp. Washer) D4 x 40 [6] <2> that connect the Hammer Case [7] <3>

with Housing (A).(B) Set [31] <28> . Remove the Hammer Case [7] <3>, the Inner Cover [23] <20> and the

Damper [24] <21> together from Housing (A).(B) Set [31] <28>. Remove the Retaining Ring [25] <22>. Then

the Gear Box Ass'y [1] <1> can be removed.

(2) Removal of the Hook Ass'y (W/Light) [36] <32>

Remove the Special Screw M5 [44] <40> with a flatblade screwdriver or a coin then remove the Hook Ass'y

(W/Light) [36] <32> and the Hook Spring [43] <39>.

(3) Removal of housing (B)

Remove the seven Tapping Screws (W/Flange) D4 x 20 (Black) [29] <26> from the main body to remove

housing (B).

(4) Remove the DC-Speed Control Switch [32] <30>, the Fin [42] <38> and the Motor [26] <23> together.

Remove the Pushing Button [33] <31> and the Strap (Black) [39] <35>.

(5) Disassembly of the switch ass'y

Disconnect the Internal Wire (Red) 115L [27] <24>, the Internal Wire (Black) 60L [28] <25> from the DC-

Speed Control Switch [32] <30> with a soldering iron. Remove the Machine Screw (W/Sp. Washer) M3 x 4

[41] <37> to remove the Fin [42] <38> from the FET of the DC-Speed Control Switch [32] <30>.

NOTE: Do not disconnect the three FET internal wires soldered to the DC-Speed Control Switch [32]

<30>.

(6) Removal of the Guide Sleeve [5] (Model WH 12DAF2 only)

By following the procedure shown in Figs. 7-1 to 7-4, you can remove the Retaining Ring [2], Washer (D) [3],

Guide Spring [4] and the Guide Sleeve [5] in this order. Be sure not to lose the Steel Ball D3.5 [8] in Anvil [9].

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