Hitachi DH 18DPA Service Manual page 6

2. Reassembly of the gear cover and cylinder ass'y
(1) Mount the Second Gear [18]{18}, Spring (A) [17]{17}, and Washer [16]{16} on the Cylinder [20]{20}
ass'y and fix them with the Retaining Ring for D25 Shaft [15]{15}. Mount the Damper [26]{26}, Thrust
Washer (A) [27]{27}, and Thrust Washer (B) [28]{28} from the rear end of the Cylinder [20]{20}. Then,
push this ass'y into the Gear Cover [9]{9} as far as it will go.
NOTE: Be sure to mount the parts in the correct order as shown in Fig. 6.
(2) Mount the O-ring [12]{12} to the Change Lever [11]{11} and put it in the hole on the Gear Cover [9]{9}.
Insert the Stopper [13]{13} into the groove inside the Change Lever [11]{11}. Then, push the Change
Lever [11]{11} in the hole of the Gear Cover [9]{9} as far as it will go.
NOTE: Push the Change Lever [11]{11} in the Gear Cover [9]{9} without tilting so that the O-ring
[12]{12} is not twisted.
(3) Set the Change Lever [11]{11} to the "Rotation + Hammering" (
Screw M4 x 5 [14]{14} to fix the Change Lever [11]{11} to the Gear Cover [9]{9}.
(4) Mount the Holder Spring [7]{7}, Holder Plate [6]{6}, and Steel Ball D7.0 [19]{19} to the tip of the Cylinder
[20]{20}. Mount the Ball Holder [5]{5} to the Grip [4]{4} and mount it to the Cylinder [20]{20}. Then,
mount the Stopper Ring [3]{3} and Front Cap [2]{2} to the Cylinder [20]{20}.
Fig. 6 • Reassembly of the gear cover and cylinder ass'y
[28]{28}
[27]{27}
[26]{26}
[18]{18}
[11]{11}
[14]{14}
[13]{13}
mark) position. Tighten the Machine
[6]{6}
[7]{7}
[5]{5}
[15]{15}
[16]{16}
[17]{17}
-5-
[5]{5}
[3]{3}
[2]{2}
[4]{4}