Hitachi DH 24PF3 Technical Data And Service Manual page 23

(2) Rotation only (Fig. 7)
Adjust the change lever to "rotation only" (
lever, and the clutch is moved forward at the back end of the lock plate. Engagement between the clutch and
the claws of the reciprocating bearing is released ( A portion in the figure). Thus no rotation is transmitted to
the reciprocating bearing and hammering is stopped. On the other hand, the pinion sleeve engages with the
second pinion ( B portion in the figure), and so the rotation is transmitted to the pinion sleeve for "rotation
only" function.
Claw of reciprocating bearing
Reciprocating bearing
(3) Hammering only (Fig. 8)
Adjust the change lever to "hammering only" (
pin of the change lever. Engagement between the pinion sleeve and the second pinion is released and no
rotation is transmitted ( B portion in the figure). The lock plate is moved to the motor side by spring (B) and
engaged with the locking claw of the second pinion to lock the cylinder rotation ( C portion in the figure).
On the other hand, the clutch engages with the reciprocating bearing for "hammering only" function ( A portion
in the figure).
A portion is meshed.
(Rotation transmitted.)
Reciprocating
bearing
mark). The lock plate is moved forward by the pin of the change
Lock plate
(Rear end portion)
Change lever pin
Lock plate (Front end portion)
C portion is meshed. (Tool locked.)
Locking claw of the second pinion
Clutch
Change lever pin
A portion is separated. (Hammering stopped.)
Second pinion
Clutch claw
Fig. 7
mark). The second pinion is moved to the motor side by the
Lock plate
Second pinion
Fig. 8
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Pinion sleeve
B portion is meshed.
(Rotation transmitted.)
Second gear
Cylinder
Pinion sleeve
B portion is separated.
(Rotation stopped.)
Spring (B)