Precautions In Disassembly And Reassembly; Disassembly - Hitachi DH 24PF3 Technical Data And Service Manual

9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY

The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded
assembly diagram.

9-1. Disassembly

(1) Disassembly of the striking mechanism section
Push the Second Hammer [29] in the main body with a drill bit or screwdriver to release the Striker [37] from
O-ring (C) [34].
Pressing the Pushing Button [18], move the Change Lever [21] to the "hammering only" mode (
(Be sure to keep pressing the Pushing Button [18] when operating the Change Lever [21].)
Loosen the four Tapping Screws (W/Flange) D5 x 35 [9], Å@Å@and remove the Gear Cover Ass'y [10]. The
Inner Cover Ass'y [41] and the Housing [68] are loosely fitted together. Attempting to pull them out first could
cause the Armature Ass'y [62] to be pulled out at the same time, causing damage to the Carbon Brushes
(Auto Stop Type) [75].
Remove Springs (B) [22] from the rails in the Gear Cover Ass'y [10] as shown in Fig. 14.
Pull out the Second Pinion [49], Clutch Spring [50], Clutch [51] and Lock Plate [48] (these parts are
sandwiched by means of the Lock Plate [48] as a unit as shown in Fig. 15) from the end of the Second Shaft
[52]. Turn the Reciprocating Bearing [53] so that the Piston [39] is moved to its maximum upper position
(Inner Cover Ass'y [41] side). The arm of the Reciprocating Bearing [53] can then be disconnected from the
Piston Pin [42], and the Second Shaft [52] and the components mounted on it can be removed from the Inner
Cover Ass'y [41] as a unit.
Remove the First Gear [54] from the Second Shaft [52] with a bearing puller. Then take off the Reciprocating
Bearing [53]. At this time, take care not to damage the end surface of the Second Shaft [52] because the First
Gear [54] is press-fitted in alignment with the 9 mm diameter end surface of the Second Shaft [52].
Pinion Sleeve [47]
Spring (B) [22]
Gear Cover Ass'y [10]
Rails
Fig. 14
Lock Plate [48]
--- 25 ---
Clutch [51]
Clutch Spring [50]
Second Pinion [49]
Fig. 15
mark).