Reassembly - Hitachi DH 24PD2 Technical Data And Service Manual

9-2. Reassembly

Reassembly can be accomplished by following the disassembly procedure in reverse. However, special attention
should be given to the following items.
(1) Application of lubricant
Apply special grease (for hammer and hammer drill) to the O-ring (1AP-20) [28] and O-ring (B) [30] for the
Hammer Holder [29], Damper (A) [31], O-ring (C) [32], O-ring [36] for the Striker [35], outer circumference of
the Striker [35], inner and outer circumference of the Piston Pin [40], outer circumference of the Piston [37],
Reciprocating Bearing [48], Reciprocating Bearing [48] rotary shaft of the Second Shaft [44], clutch claw of
the Cylinder [22], inner circumference of the metal of the Inner Cover [39], Second Hammer [27], and the lip
portion of the Oil Seal [16]. Fill 50 g of the special grease in the gear cover and 10 g in the inner cover
groove. Apply Molub Alloy No. 777-1 grease to the outer circumference of the Clutch [47] groove and the pin
portion of the Change Lever [14]. Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [15] for the Steel
Ball D7.0 [21] and the Change Lever [14].
* Application of Hitachi Motor Grease No. 29 makes it easy to mount the Spacer [42].
(2) When assembling Housing [72], Casing (A) [65], Casing (B) [57] and Gear Cover [10], at fitst perform the
assembling of dust collection mechanism ass'y [55], [56], [58], [59] and [61] to [65] and the armature section
([66], [67], [56] and [71]) as illustrated below. Then, reassemble the Housing [72], Casing (B) [57] and the
Gear Cover [10] (Fig. 18). This procedure will significantly facilitate reassembly.
(3) When mounting the Nozzle Seal [93], ensure without fail that the section marked "A" is properly aligned with
and fitted into the groove on the nozzle, as indicated in Fig. 19.
[56] [58] [59]
[55]
(4) Mounting the oil seal
Prior to reassembly, apply grease to the inner circumference of the Oil Seal [16]. However, do not apply
grease to its outer circumference. Also, when press-fitting the Oil Seal [16], ensure it is straight and level.
[63]
[62] [64]
[61]
Fig. 18
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[65] [66] [67] [56] [71]
[93]
Fig. 19