Reassembly - Hitachi DH 24PM Technical 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) [44] and O-ring (B) [46] for the
Hammer Holder [45], Damper (A) [47], O-ring (C) [48], O-ring (I.D. 16) [52] for the Striker [51], outer
circumference of the Striker [51], inner and outer circumference of the Piston Pin [64], outer circumference of
the Piston [53], Reciprocating Bearing [65], Reciprocating Bearing [65] rotary shaft of the Second Shaft [63],
Second Pinion [59] rotary shaft, clutch claw of the Cylinder [38], inner circumference of the metal of the Inner
Cover Ass'y [56], Second Hammer [43], and the lip portion of the Oil Seal [21]. Fill 45 g of the special grease
in the gear cover and 5 g in the inner cover groove. Apply Molub Alloy No. 777-1 grease to the pin portion of
the Change Lever [34]. Apply Molub Alloy No. 777-1 grease to the contact portion between the Clutch [61],
Washer (D) [62] and the Lock Plate [58]. Fill Molub Alloy No. 777-1 grease in the ball portion of the
Reciprocating Bearing [65]. Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [33] for the Change Lever
[34] and the Steel Ball D7.0 [14].
(2) Mounting the Cylinder [38]
Mount the Second Hammer [43], O-ring (1AP-20) [44], Hammer Holder [45], O-ring (B) [46], Damper (A) [47],
new O-ring (C) [48] and Damper Holder [49] in the Cylinder [38]. Push the new Stopper Ring [50] in the
Cylinder [38] then push in the hole side of stopper ring jig (A) (J-341) on it as shown in Fig. 25. Push the
upper end surface of stopper ring jig (A) (J-341) with a hand press to fit the Stopper Ring [50] in the groove of
the inside diameter portion of the Cylinder [38]. Check that the Stopper Ring [50] is securely fitted in the
groove of the inside diameter portion of the Cylinder [38] viewing from the 5-mm diameter hole (2 pcs.) on the
Cylinder [38].
Hammer Holder [45]
Second Hammer [43]
O-ring (B) [46]
O-ring (1AP-20) [44]
Damper (A) [47]
5-mm diameter hole (2 pcs.)
Damper Holder [49]
O-ring (C) [48]
Stopper Ring [50]
Stopper ring jig (A) (J-341)
Fig. 25
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Hand press