Reassembly - Hitachi DH 24DVA 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) [30] and O-ring (B) [32] for the
Hammer Holder [31], Damper (A) [33], O-ring (C) [34], O-ring (I.D.16) [38] for the Striker [37], outer
circumference of the Striker [37], inner and outer circumference of the Piston Pin [50], outer circumference of
the Piston [39], Reciprocating Bearing [51], Reciprocating Bearing [51] rotary shaft of Second Shaft (A) [49],
Second Pinion [43] rotary shaft, clutch claw of the Cylinder [17], inner circumference of the metal of the Inner
Cover Ass'y [42], Second Hammer [29], and the lip portion of the Oil Seal [11]. 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
Change Lever (A) [19]. Apply Molub Alloy No. 777-1 grease to the contact portion between the Clutch [45]
and the Lock Plate [48]. Fill Molub Alloy No. 777-1 grease in the ball portion of the Reciprocating Bearing [51].
Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [20] for the Steel Ball D7.0 [16] and Change Lever (A)
[19].
(2) Mounting the Cylinder [17]
Mount the Second Hammer [29], O-ring (1AP-20) [30], Hammer Holder [31], O-ring (B) [32], Damper (A) [33],
new O-ring (C) [34] and Damper Holder [35] in the Cylinder [17]. Push the new Stopper Ring [36] in the
Cylinder [17] then push in the hole side of stopper ring jig (A) (J-341) on it as shown in Fig. 21. Push the upper
end surface of stopper ring jig (A) (J-341) with a hand press to fit the Stopper Ring [36] in the groove of the
inside diameter portion of the Cylinder [17]. Check that the Stopper Ring [36] is securely fitted in the groove of
the inside diameter portion of the Cylinder [17] viewing from the 5-mm diameter holes (2 pcs.) on the Cylinder
[17].
Hammer Holder [31]
Second Hammer [29]
O-ring (B) [32]
O-ring (1AP-20) [30]
Damper (A) [33]
5-mm diameter hole (2 pcs.)
Damper Holder [35]
O-ring (C) [34]
Stopper Ring [36]
Stopper ring jig (A) (J-341)
Fig. 21
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Hand press