Hitachi DS 12DM, Технические данные и руководство по обслуживанию

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(6) Disassembly of the drive unit
(a) Remove the Clutch Dial [4] and the Click Spring [9] from the Front Case [8].
(Note) Do not remove the Nut [5] from the Front Case [8] in this step.
(b) Remove the Shift Arm [20] from the Gear Box Ass'y [3] and remove the Shift Knob [39] from the Shift Arm
[20]. Do not deform the Shift Arm [20] by applying excessive force.
(c) Turn the Motor Spacer [28] until a click is heard counterclockwise viewing from the rear of the Armature
[29]. Remove the Motor Spacer [28] from the Rear Case [18]. Thus the armature unit is separated from
the gear unit.
(7) Disassembly of the armature unit
(a) Removal of the Magnet [30]
Note that the magnetic force of the Magnet [30] is strong. Hold the Motor Spacer [28] securely and pull
toward the back of the Armature [29] to remove (see Fig. 8).
(Note) Be careful that the ball bearing and the washer behind the Armature [29] may be attracted to the
Magnet [30] and come off the Armature [29] when removing the Magnet [30]. Do not remove washer
(M) that is attracted to the Magnet [30] by the magnetic force.
(b) Removal of the Dust Guard [31]
Remove the Dust Guard [31] that is attracted to the Magnet [30] by the magnetic force (see Fig. 8).
(c) Removal of the Motor Spacer [28]
Remove the Motor Spacer [28] from the Armature [29]. If it is too hard to remove, support the Motor
Spacer [28] and press down the tip of the armature shaft of the Armature [29] with a hand press.
(8) Disassembly of the gear unit
(a) Disassembly of the deceleration mechanism
Turn Plate (A) [27] mounted in the Rear Case [18] counterclockwise to remove. Take out the First Ring
Gear [26], Planet Gear (A) Set (4 pcs.) [25], Pinion (B) [24], Planet Gear (B) Set (4 pcs.) [23], Pinion (C)
[22] and Slide Ring Gear [21] in order. Then remove the Screw Set D3 x 12 (4 pcs.) [19] that connects the
Front Case [8] with the Rear Case [18]. Take out Plate (B) [17], Planet Gear (C) Set (3 pcs.) [16], Carrier
[15], Ring Gear [13], Needle Roller (C) Set (6 pcs.) [14], Lock Ring [12], six Steel Balls D5 [11] and six
Rollers [10] from the Front Case [8] in order.
(Note) Do not lose small parts. Pay special attention to the six Steel Balls D5 [11], six Rollers [10] and
Needle Roller (C) Set (6 pcs.) [14] because they are apt to roll.
(b) Disassembly of the clutch mechanism
Turn the Nut [5] counterclockwise to remove from the Front Case [8] . Take out the Spring [6] and the
Thrust Plate [7] in order.
(Note) Do not disassemble the Front Case [8].
(9) Disassembly of the power supply unit
Remove two Machine Screws (W/Sp. Washer) M3 x 4 [40] and a Machine Screw (W/Sp. Washer) M3 x 4 [40].
Then the DC-Speed Control Switch [41] and the Fin [46] can be removed.
(Note) Be careful in handling the FET and the internal wires of the DC-Speed Control Switch [41] as they are
apt to be broken at their roots. Do not disconnect three FET internal wires and two terminal internal
wires soldered to the DC-Speed Control Switch [41].