Hitachi WH 14DBDL Service Manual page 11

2. Mounting the mechanical parts
(1-1) Model WH 14DBDL / WH 18DBDL
Load 28 Steel Balls D3.175 [11]<8> in the Hammer [10A]<7A> and then reassemble Washer (J)
[12]<9>, Hammer Spring (H) [13A]/Hammer Spring (F) <10>, Washer (S) [14]<11>, and the Spindle
[16]<13> in this order.
(1-2) Model WR 14DBDL type / WR 18DBDL
Load 28 Steel Balls D3.175 [11]<8> in the Hammer [10A]<7A> and then reassemble Washer (J)
[12]<9>, Hammer Spring (H) [13A]/Hammer Spring (F) <10>, Washer (J) [12]<9>, Washer (S)
[14]<11>, and the Spindle [16]<13> in this order.
(2) Match the top of the cam groove in the Spindle [16]<13> with the steel ball insertion groove in the
Hammer [10A]<7A>, push down the end tub of the Hammer [10A]<7A> with a hand press or similar tool,
compress Hammer Spring (H) [13A]/Hammer Spring (F) <10> until it hits Spindle [16]<13>, and then
support it.
(3) Put two Steel Balls D5.556 [9]<6> in the steel ball insertion groove. Make sure the Steel Balls D5.556
[9]<6> are in the cam groove, and then release the hand press.
(4) Settle the hammer assembly on the dedicated tool washer (S) rest (Model J- 297), push down the end
of the Spindle [16]<13>, compress Hammer Spring (H) [13A]/Hammer Spring (F) <10>, fit the Stopper
(B) [15A]<12A> to the spindle shaft, and then release the hand press.
(5) Mount the two Idle Gear Sets [17]<14> and two Needle Rollers [18]<15> on the Spindle [16]<13>, and
then insert Washer (E) [21]<18>.
(6) Press-fit the Ball Bearing 6901VVCMPS2L [22]<19> to the Inner Cover [24]<21>, insert two Dampers (A)
[23]<20> according to the shape of the Inner Cover [24]<21>, and then fit the O-Ring (S-42) [20]<17> to
Ring Gear (E) [19A]<16>. Match the detent rib of Ring Gear (E) [19A]<16> with the depressed portion
of Damper (A) [23]<20>.
(7) Make sure Washer (E) [21]<18> is inserted into the Spindle [16]<13>.
[24]<21> and Hammer Case [6A]<2> with their ribs perpendicular to each other, while making sure the
Idle Gear Set [17]<14> of the hammer assembly is engaged with Ring Gear (E) [19A]<16>.
(8) Insert Anvil (D) [8A]/Anvil (D) Ass'y <4> to the end of the Spindle [16]<13> of the hammer assembly
and then set the Hammer Case [6A]<2> in place.
Make sure the rib of the Inner Cover [24]<21> is perpendicular to the rib of the Hammer Case [6A]<2>.
(9) Mount the Rotor Pinion [25]<22> on the assembled Inner Cover [24]<21>.
After remounting, make sure the Rotor Pinion [25]<22> rotates smoothly. If it does not rotate smoothly,
the gears are not properly engaged. In such case, correctly remount the Rotor Pinion [25]<22>.
Fig.9 • Reassembly of the impact mechanism
90°
Inner cover rib
-10-
Mount the Inner Cover
Hammer case rib