Hitachi DH 25DL Technical Data And Service Manual page 25

5. Mounting the piston
Mount the Piston [40] facing its two 2-mm diameter holes to Second Shaft (A) [50].
Mounting the piston
6. Mounting gear cover (A)
First, mount Change Lever (A) [20] and the lock plate ass'y to Gear Cover (A) [10] then mount it to the
main body. At this time, engage the gear in 3 points (A, B and C) according to either of the following
methods:
1) Mount the drill bit and turn it by a hand slowly, or
2) Install the battery and pull the trigger switch for a quick moment to turn the motor.
Be careful when tightening the Tapping Screws (W/Flange) D5 x 25 (Black) [9] and the Tapping Screws
(W/Flange) D5 x 30 (Black) [88] because they are different in length.
Upper side ... Two Tapping Screws (W/Flange) D5 x 25 (Black) [9]
Lower side ... Two Tapping Screws (W/Flange) D5 x 30 (Black) [88]
Mounting gear cover (A)
Inner Cover Ass'y [43]
First Gear [54]
Striker [38]
Piston [40]
2-mm diameter holes (2 pcs.)
Second Shaft (A) [50]
Reciprocating Bearing [52]
B point
C point
-22-
A point