Hitachi WH 14DMR Technical Data And Service Manual page 33

(6) Removal of the Carbon Brushes 5 x 6 x 11.5 [31] <28>
Remove the two Brush Caps [32] <29>. Catch the flanges of the Carbon Brushes 5 x 6 x 11.5 [31] <28> with
a small flat-blade screwdriver and remove the Carbon Brushes 5 x 6 x 11.5 [31] <28> at both sides.
(7) Removal of housing (B)
Remove the seven Tapping Screws (W/Flange) D4 x 20 (Black) [33] <30> from the main body. The Strap
(Black) [43] <40> can be removed by removing the Tapping Screw (W/Flange) D4 x 20 (Black) [33] <30>.
Before removing housing (B), be sure to remove the Brush Caps [32] <29> because housing (B) cannot be
removed if the Brush Caps [32] <29> are mounted.
(8) Removal of the switch
The FET of the DC-Speed Control Switch [38] <35> is firmly inserted in the housing. Insert a small flat-blade
screwdriver between the FET and housing (B) to raise and remove the FET. Then, Inner Cover (B) [25] <22>,
Armature and Pinion Set [26] <23>, Magnet (F) Ass'y [28] <25>, Brush Block [30] <27> and DC-Speed
Control Switch [38] <35> can be removed in a piece. Pushing Button (B) [39] <36> can also be removed.
NOTE: Be careful not to break the three legs coming from the FET to avoid malfunction of the switch.
(9) Removal of the switch assembly
Remove the two Machine Screws (W/Sp. Washer) M3 x 5 [37] <34> that secure the flag terminal and then
disconnect the internal wires (red and black) of the Brush Block [30] <27> from the DC-Speed Control Switch
[38] <35>.
NOTE: Do not disconnect the three FET internal wires soldered to the DC-Speed Control Switch [38]
<35>.
(10) Removal of Magnet (F) Ass'y [28] <25>, Dust Guard Fin (B) [29] <26> and Side Yoke (A) [27] <24>
Remove Magnet (F) Ass'y [28] <25> in the "B" direction (see Fig. 10) holding Inner Cover (B) [25] <22>
securely because Magnet (F) Ass'y [28] <25> has a strong magnetism. Dust Guard Fin (B) [29] <26> and
Side Yoke (A) [27] <24> can be easily removed from Magnet (F) Ass'y [28] <25> by holding Magnet (F) Ass'y
[28] <25> securely and pulling them in the direction of diameter because they are mounted to Magnet (F)
Ass'y [28] <25> magnetically.
--- 30 ---