Hitachi DH 24PM Technical And Service Manual page 34

(3) Mounting the change lever
Press the Pushing Button [31] deeply into the hole of the Change Lever [34]. Adjust the Change Lever [34] to
the position shown in Fig. 26 of the Gear Cover Ass'y [18] and press it hard. Then move the Change Lever
[34] to the "Hammering only" position (
(4) Press-fitting the first gear
Press-fit the First Gear [66] aligning with the shaft end surface of the Second Shaft [63]. After press-fitting the
First Gear [66], check that the inside ring of the Reciprocating Bearing [65] turns smoothly.
(5) Mounting the oil seal
Prior to reassembly, apply grease to the inner circumference of the Oil Seal [21]. However, do not apply
grease to its outer circumference. Also, when press-fitting the Oil Seal [21], ensure that it is straight and level.
(6) Reassembly of the internal pressure adjustment mechanism
Push Felt Packing (A) [69], Valve [70] and Felt Packing (B) [71] in the Inner Cover Ass'y [56] as far as they
will go in this order.
Felt Packing (A) [69]
mark).
Change Lever [34]
Felt Packing (B) [71]
Valve [70]
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Pushing Button [31]
Fig. 26
Inner Cover Ass'y [56]
Fig. 27