Hitachi DS 12DVF2, Technical Data And Service Manual

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10. REPAIR GUIDE
Be sure to remove the storage batteries from the main body before servicing. Inadvertent triggering of the switch
with the storage battery connected will result in the danger of accidental turning of the motor.
10-1. Precautions in Disassembly and Reassembly
The [Bold] numbers in the description below correspond to the item numbers in the Parts List and exploded
assembly diagram for the Models DS 14DVF2, DS 12DVF2 and DS 9DVF2.
10-1-1. Disassembly
(1) Removal of Housing (A). (B) Set [32]
Remove the eight (seven: Models DS 12DVF2 and DS 9DVF2) Tapping Screws (W/Flange) D3 x 16 (Black)
[27] secured to the main body. Gently open Housing (A) and (B) while holding their battery loading sections.
(2) After housing (B) has been removed, all the internal parts, assembled or separate, can be taken out as they
are. Lift the entire contents from housing (A) while holding the Motor [26] and the Cap [4] .
(3) Removal of the Drill Chuck 10TLRD-N (W/O Chuck Wrench) [2] (See Fig. 4.)
(a) Turn the Motor [26] counterclockwise (when viewed from the rear) and remove it from the Rear Case [15] .
Remove the Shift Knob [38] from the Shift Arm [17] . Take care not to remove the Shift Arm [17] from the
Rear Case [15] in this operation.
(b) Attach the motor spacer (an accessory of the special repair tool J-292, Code No. 316379) to the assembly
of the Drill Chuck 10TLRD-N (W/O Chuck Wrench) [2] , Cap [4] , Front Case [9] and Rear Case [15] then
mount it in special repair tool J-292 clamped in the vise as illustrated in Fig. 4. In this operation, check that
the pinion press-fitted in the special repair tool J-292 and Planet Gear (A) Set [22] are engaged properly.
(c) Turn the Cap [4] clockwise (when viewed from the front) until it can turn no further. In this position, the drill
mark " " on the Cap [4] is positioned on the Shift Arm [17] side. Secure the Slide Ring Gear [18] to
the Front Case [9] side with the Shift Arm [17] .
(d) Turn the sleeve of the Drill Chuck 10TLRD-N (W/O Chuck Wrench) [2] counterclockwise (when viewed
from the front) to fully open the jaws of the Drill Chuck 10TLRD-N (W/O Chuck Wrench) [2] . Turn the
Special Screw (Left Hand) M5 x 27 [1] clockwise and remove it. (Note that the special screw is left-hand
threaded.)
(e) Fit the hexagonal bar wrench M10 into the Drill Chuck 10TLRD-N (W/O Chuck Wrench) [2] as illustrated in
Fig. 4 and remove the Drill Chuck 10TLRD-N (W/O Chuck Wrench) [2] by turning the hexagonal bar
wrench counterclockwise.