Hitachi DS 18DMR Service Manual page 26

(4) Adjust the frong Cap [4] to "
(5) Disassembly of the main unit
Remove the ten Tapping Screws (W/Flange) D3 x 16 (Black) [34] from the main unit. Holding the battery
chamber of Housing (B) [36], gently remove Housing (B) [36]. Then the inside parts can be removed in an
assembled or single state. All the parts can be easily removed by raising the Front Cap [4]. Parts are
separated into the drive unit (an assembly of the armature and the gear unit), power supply unit, Pushing
Button [41] and Strap [52].
(6) Disassembly of the drive unit
(a) Remove the Front Cap [4] and the Click Spring [11] from the Front Case [10].
(Note) Do not remove the Nut [5] from the Front Case [10] in this step.
(b) Remove the Shift Arm [19] from the Gear Box Ass'y [3] and remove the Shift Knob [39] from the Shift Arm
[19]. Do not deform the Shift Arm [19] by applying excessive force.
(c) Turn the Motor Spacer [28] until a click is heard counterclockwise viewing from the rear of the Armature
and Pinion Set [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 and Pinion Set [29] to remove (see Fig. 10).
(Note) Be careful that the ball bearing and the washer behind the Armature and Pinion Set [29] may be
attracted to the Magnet [30] and come off the Armature and Pinion Set [29] when removing the
Magnet [30].
(b) Removal of the Motor Spacer [28]
Remove the Motor Spacer [28] from the Armature and Pinion Set [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 and Pinion Set [29]
with a hand press.
(8) Disassembly of the gear unit
(a) Disassembly of the deceleration mechanism
Turn Washer (B) [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 (5 pcs.) [23], Pinion (C)
[22] and Slide Ring Gear [21] in order. Then remove the Screw Set D3 x 12 (4 pcs.) [20] that connects the
Front Case [10] with the Rear Case [18]. Take out Washer (A) [17], Planet Gear (C) Set (5 pcs.) [16],
Carrier [15], Ring Gear [14], Pin Set (6 pcs.) [12] and Lock Ring [13] from the Front Case [10] in order.
(Note) Do not lose small parts. Pay special attention to the Pin Set (6 pcs.) [12], because they are apt to
roll.
(b) Disassembly of the clutch mechanism
Turn the Nut [5] counterclockwise to remove from the Front Case [10]. Take out the Spring [6], Thrust
Washer [7], Stopper [8] and Stopper Spring [9] in order.
".
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