Repair Guide; Precautions In Disassembly And Reassembly - Hitachi DV 18DMR Technical Data And Service Manual

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 danger of accidental turning of the motor.

10-1. Precautions in Disassembly and Reassembly

The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded
assembly diagrams for the Models DV 18DMR and DV 14DMR.
10-1-1. Disassembly
(1) Removal of the Hook Ass'y [51] [53]
Remove Special Screw (A) M5 [57] with a flat-blade screwdriver or a coin. Remove the Hook Ass'y [51] [53]
and the Hook Spring [56].
(2) Removal of the Carbon Brushes 5 x 6 x 11.5 [34]
Remove the Brush Cap [35] first then pry the Carbon Brush 5 x 6 x 11.5 [34] off with a flat-blade screwdriver
(at the position of collars). Remove the Brush Caps [35] and the Carbon Brushes 5 x 6 x 11.5 [34] at both
sides.
(3) Removal of the Drill Chuck 13VLRL-N (W/O Chuck Wrench) [2]
Perform the following steps (a) and (b) with the main unit mounted in the vise for removal of the Drill Chuck
13VLRL-N (W/O Chuck Wrench) [2]. At this time, it is recommended to sandwich a cloth between the main
unit and the vise to prevent Housing (A).(B) Set [38] from being scratched.
(a) Fully open the jaws of the Drill Chuck 13VLRL-N (W/O Chuck Wrench) [2] and remove the Special Screw
(Left Hand) M6 x 23 [1] by turning clockwise (be careful that it is a left-handed screw).
(b) Fix the hexagonal bar wrench M10 into the Drill Chuck 13VLRL-N (W/O Chuck Wrench) [2] as shown in
Fig. 3 then turn it counterclockwise to remove the Drill Chuck 13VLRL-N (W/O Chuck Wrench) [2].
Hexagonal bar wrench
Cloth
Vise
Fig. 3
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