Hitachi wh 14daf2 Technical Data And Service Manual page 21

Remove the hammer assembly from the J-297 base for washer (S) and support the end surface of Spindle (B)
[17]. With a hand press, push down either of the raised faces of the Hammer [11] to compress the Hammer
Spring [14]. In this position, extract the two Steel Balls D5.556 [10] from the cam grooves of Spindle (B) [17]
and the Hammer [11] with a small flat-blade screwdriver or a similar tool. Then, slowly release the hand press
and lift the Hammer [11] and Washer (S) [15] together to extract them from Spindle (B) [17]. The Hammer
Spring [14] can then be removed.
Spindle (B) [17]
Hammer [11]
10-1-2. Reassembly
Reassembly can be accomplished by following the disassembly procedures in reverse. However, special
attention should be given to the following items.
(1) Reassembly of housing (A) assembly
(a) Be sure to follow the wiring diagram (Fig. 10 ) for proper wiring.
(b) Pay attention to the polarity of the Motor [26] when soldering the Internal Wire (Red) 115L [27] and Internal
Wire (Black) 65L [28] to the Motor [26]. The red-marked side of the Motor [26] is positive.
(c) When mounting the Motor [26] into housing (A), pay attention to the position of the Internal Wire (Red) 115L
[27] and the depression for preventing motor body from rotating in housing (A).
NOTE: Make sure that the Internal Wire (Red) 115L [27] is passed under the motor so that it is not
caught between the motor and housing (A).
(d) Mount the DC-Speed Control Switch [32] to housing (A) so that the projection of the forwarding/reversing
lever at the top of the switch is inserted into the U-shaped groove of the Pushing Button [33]. Secure the
Fin [41] to the FET of the DC-Speed Control Switch [32] with the Machine Screw (W/Sp. Washer) M3 x 4
[40].
NOTE: Make sure that the three internal wires from the FET are passed above the DC-Speed
Control Switch [32]. To avoid pinching, be careful not to place the internal wire of the
battery terminal on the terminal plate of the DC-Speed Control Switch [32].
Top of spindle cam
Raised faces of hammer
Steel Ball D5.556 [10]
Fig. 9
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Steel ball guide groove