Repair Guide; Precautions On Disassembly And Reassembly - Hitachi DV 22V Service Manual

20/22 mm impact drill

Table of Contents

WARNING: Be sure to disconnect the power cord plug from the power supply before conducting

repair. Otherwise, the motor may suddenly turn on, posing a very dangerous situation.

[Bold] numbers in the description below correspond to the item numbers in the parts lists and exploded

assembly diagrams for the Models DV 22V and DV 20VD.

1. Removal of the drill chuck

The Drill Chuck [3] is secured to Spindle (A) [4] with the 1/2"-20 UNF right-handed screw and Flat Hd.

Screw (A) (Left Hand) M6 x 25 [1]. At first, fully open the chuck jaws and loosen Flat Hd. Screw (A) (Left

Hand) M6 x 25 [1] by turning it clockwise.

(1) Hold the drill so that only the Drill Chuck [3] rests firmly and squarely on the edge of a solid bench.

Insert a hex. bar wrench into the Drill Chuck [3]. Turn the Drill Chuck [3] until the wrench is positioned

at an angle of about 30° with respect to the bench top, and then sharply strike the wrench with a

hammer so that the Drill Chuck [3] turns counterclockwise. (Fig. 1)

Fig. 1 • Removal of the drill chuck

If the Drill Chuck [3] cannot be removed by striking the wrench, do not strike the wrench forcibly and

try another way as described in step (2).

REPAIR GUIDE

Disassembly

Hex. bar wrench

[1]

Loosen

-1-

Table of Contents

Dv 20vd