Repair Guide; Precautions In Disassembly And Reassembly - Hitachi DB 10DL Technical Data And Service Manual

Be sure to remove the storage battery (BCL 1015) from the main body before servicing. Inadvertent
triggering of the switch with the storage battery connected will result in danger of accidental turning of the
motor.

1. Precautions in disassembly and reassembly

The [Bold] numbers in the description below correspond to the item numbers in the Parts List and the
exploded assembly diagram for the Model DB 10DL.
(1) Removal of Housing (A).(B) Set [31]
Remove the seven Tapping Screws (W/Flange) D3 x 16 (Black) [36]. Holding the battery chamber of
Housing (A).(B) Set [31], open Housing (A).(B) Set [31] gently. After opening Housing (A).(B) Set [31], all
the internal parts can be removed separately or in an assembled status. Lift the Motor [30] and the Clutch
Dial [6] from Housing (A).(B) Set [31]. Then all the internal parts can be removed easily. The internal parts
are separated into the drive unit (Gear Box Ass'y [1]), power supply unit (Motor [30], DC-Speed Control
Switch [35] and Controller (B) [39]) and Pushing Button (A) [34].
(2) Removal of the drive unit from the power supply unit
Hold the Motor Spacer [29] and the Motor [30] of the Gear Box Ass'y [1] and pull it in the axial direction.
Then the drive unit can be removed from the power supply unit.
(3) Disassembly of the drive unit
(a) Disassembly of the deceleration mechanism
Twist the Motor Spacer [29] counterclockwise to remove it from the Gear Case [12]. Remove Washer
(A) [28] then remove the First Ring Gear [27], Planet Gear (A) Set (3 pcs.) [26] and Pinion (B) [25] in
order. Remove the two Needles [13] inserted through the side of the Gear Case [12]. Remove Washer
(B) [24], Planet Gear (B) Set (3 pcs.) [23], Pinion (C) [22], Washer (C) [21], Planet Gear (C) Set (3 pcs.)
[17], Carrier [19], Ring Gear [20], Needle Roller Set (6 pcs.) [16], six Steel Balls D4 [15], Pin Set (6
pcs.) [14] and Lock Ring [18] in order.
NOTE: Do not lose the small parts. Especially be careful not to lose the Needle Roller Set (6 pcs.)
[16], six Steel Balls D4 [15] and Pin Set (6 pcs.) [14] because they are apt to roll.
(b) Removal of Guide Sleeve (A) [5]
Remove the Retaining Ring [2], Washer (D) [3], Guide Spring [4] and Guide Sleeve (A) [5] in order
following the procedure shown in Fig. 1. One side of the gap of the Retaining Ring [2] is raised. Slowly
raise the other side of the gap with a small flat-blade screwdriver to remove the Retaining Ring [2].
Avoid quickly raising the Retaining Ring [2] or it may fly out forcefully. Do not lose the Steel Ball D3.5
[11] in the socket hole.
(c) Disassembly of the clutch mechanism
Remove the Clutch Dial [6] and the Click Spring [7]. (Remove Guide Sleeve (A) [5].)
Turn the Nut [8] counterclockwise and remove it from the Gear Case [12]. Then remove the Spring [9]
and Washer (D) [10] in order.
NOTE: Do not remove the Gear Case [12].

REPAIR GUIDE

Disassembly
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