Hitachi DH 18DPA Service Manual page 9

5. Reassembly of the gear cover ass'y
(1) After mounting the hammering mechanism to Inner Cover (A) Ass'y [49]{49}, insert Spring (B) [33]{33}
into the tip of Inner Cover (B) [35]{35}. Mount the Thrust Plate [32]{32} to the Piston [31]{31} fitting its
bottom in the outside groove on the Clutch [44]{44}. At this time, mount the Thrust Plate [32]{32} so that
its notch is aligned with the Change Lever [11]{11} receiving portion of Inner Cover (A) Ass'y [49]{49}.
(2) Check that Thrust Washer (A) [27]{27} and Thrust Washer (B) [28]{28} are mounted to the rear of the
Cylinder [20]{20} in the Gear Cover [9]{9}. Put 15 grams of grease for rotary hammer in the Gear Cover
[9]{9}.
NOTE: When putting grease for rotary hammer in the Gear Cover [9]{9}, do not put grease in the
Cylinder [20]{20}. Do not apply grease to the 13-mm dia. shaft of the Change Lever [11]{11}
and Machine Screw M4 x 5 [14]{14}.
(3) Set the Change Lever [11]{11} on the Gear Cover [9]{9} to the "Rotation + Hammering" (
position. Press the Gear Cover [9]{9} against Housing (A).(B) Set [63]{63} so that they are properly
mounted. At this time, check that the Piston [31]{31} is inserted into the Cylinder [20]{20}.
NOTE: • Be careful not to get O-ring (A) [36]{36} caught between the Gear Cover [9]{9} and
Housing (A).(B) Set [63]{63}.
• If the Gear Cover [9]{9} cannot be mounted to Housing (A).(B) Set [63]{63} due to
improper engagement between the Second Gear [18]{18} and Second Shaft (A) [43]{43},
insert the SDS-plus shank into the Cylinder [20]{20} and turn the Cylinder [20]{20} to
properly engage the Second Gear [18]{18} with Second Shaft (A) [43]{43}.
Fig. 10 • Reassembly of the gear cover ass'y
[49]{49}
[36]{36}
[63]{63}
[32]{32}
[49]{49}
[32]{32}
[33]{33}
[35]{35}
[28]{28}
[44]{44}
Change Lever [11]{11}
receiving portion
Notch
-8-
[9]{9}
[31]{31}
Put 15 grams of grease
for rotary hammer in it.
[27]{27}
13-mm dia. shaft of [11]{11}
mark)
[20]{20}
[14]{14}