Hitachi DH 40FR Technical Data And Service Manual page 19

(4) Disassembly of the cylinder
As illustrated in Fig. 12, insert the drill bit secured with a vise into the Second Hammer [10] and Cylinder [17].
Put the wrench (J-123 No. 970885) to the width across flats of the Cylinder Cap [13] and turn it to loosen the
Cylinder Cap [13] (right-hand thread). Remove the Cylinder Cap [13] and the Ball Bearing 6007DDUAV2S
[15] with a hand press. Then the Cylinder [17] can be pulled out.
Second Hammer [10]
(5) Disassembly of the slip clutch
Remove the Ball Bearing 629VVC2PS2L [52] with a
bearing puller. Place the assembly on a sleeve-type
support facing Washer (A) [46] downward as shown in
Fig. 13. Push the Spacer [51] side of the Bevel Pinion
[41] with a hand press to remove the Gear Holder [47]
and the Spacer [51] from the Bevel Pinion [41]. Before
removal of the Second Gear [50] from the Gear Holder
[47], put the assembly in a poly bag and disassemble it
inside the poly bag to prevent missing of Spring (C) [48]
and the Needle [49].
Cylinder [17]
Ball Bearing
6007DDUAV2S [15]
Cylinder Cap [13]
Wrench
Drill bit
Vise
Fig. 12
Fig. 13
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Press the end surface
of the bevel pinion with
a hand press.
Bevel Pinion [41]
Spacer [51]
Washer (A) [46]
Support