Hitachi DV18DL - 18V 3.0Ah Lithium Ion Cordless Hammer Drill Service Manual page 21

(4) Adjust the Front Cap [4] <4> to "
(5) Disassembly of the main unit
Remove the ten Tapping Screws (W/Flange) D3 x 16 (Black) [36] <36> from the main unit. Holding the battery
chamber of Housing (B) [38] <38>, gently remove Housing (B) [38] <38>. 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]
<4>. Parts are separated into the drive unit (an assembly of the armature and the gear unit), power supply
unit, Pushing Button [45] <46> and Strap (Black) [57] <55>.
(6) Disassembly of the drive unit
(a) Remove the Front Cap [4] <4> and the Click Spring [12] <12> from the Front Case [11] <11>.
NOTE: Do not remove the Nut [6] <6> from the Front Case [11] <11> in this step.
(b) Remove the Shift Arm [21] <21> from the Gear Box Ass'y [3] <3> and remove the Shift Knob [41] <41>
from the Shift Arm [21] <21>. Do not deform the Shift Arm [21] <21> by applying excessive force.
(c) Turn the Motor Spacer [30] <30> until a click is heard counterclockwise viewing from the rear of the
Armature and Pinion Set [31] <31>. Remove the Motor Spacer [30] <30> from the Rear Case [20] <20>.
Thus the armature unit is separated from the gear unit.
(7) Disassembly of the armature unit
(a) Removal of the Magnet [32] <32>
Note that the magnetic force of the Magnet [32] <32> is strong. Hold the Motor Spacer [30] <30> securely
and pull toward the back of the Armature and Pinion Set [31] <31> to remove.
NOTE: Be careful that the ball bearing and the washer behind the Armature and Pinion Set [31]
<31> may be attracted to the Magnet [32] <32> and come off the Armature and Pinion Set
[31] <31> when removing the Magnet [32] <32>.
(b) Removal of the Motor Spacer [30] <30>
Remove the Motor Spacer [30] <30> from the Armature and Pinion Set [31] <31>. If it is too hard to
remove, support the Motor Spacer [30] <30> and press down the tip of the armature shaft of the Armature
and Pinion Set [31] <31> with a hand press.
(8) Disassembly of the gear unit
(a) Disassembly of the deceleration mechanism
Turn Washer (B) [29] <29> mounted in the Rear Case [20] <20> counterclockwise to remove. Take out the
First Ring Gear [28] <28>, Planet Gear (A) Set (4 pcs.) [27] <27>, Pinion (B) [26] <26>, Planet Gear (B)
Set (4 pcs.) [25] <25>, Pinion (C) [24] <24> and Slide Ring Gear [23] <23> in order. Then remove the
Screw Set M3 x 12 (4 pcs.) [22] <22> that connects the Front Case [11] <11> with the Rear Case [20]
<20>. Take out Washer (D) [19] <19>, Planet Gear (C) Set (5 pcs.) [18] <18>, Carrier [17] <17>, Ring
Gear [16] <16>, Pin Set (6 pcs.) [13] <13>, Lock Ring [15] <15> and Washer (A) [14] <14> from the Front
Case [11] <11> in order.
NOTE: Do not lose small parts. Pay special attention to the Pin Set (6 pcs.) [13] <13>, because they
are apt to roll.
(b) Removal of the Switch Plate [5] <5>
Turn the switch flange so as to fit the projection of the switch flange to the recess of the Switch Plate [5]
<5>, then remove the Switch Plate [5] <5> from the Front Case [11] <11>. (See Fig. 4.)
".
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