Hitachi WR 16SE Repair Manual page 2

Before attempting disassembly or reassembly, always remember to turn off the power switch and
disconnect the plug from the power source outlet.
1. Precautions on disassembly and reassembly
[Bold] numbers in the descriptions below correspond to the numbers in the Parts List and exploded
assembly diagram for the Model WR 16SE.
1. Removal of the hammer case ass'y
(1) Insert a flat-blade screwdriver into a gap between Bumper (A) [1] and the Hammer Case Ass'y [3], and
then remove Bumper (A) [1].
(2) Remove the four Bolts M5 x 35 [2]. Remove the Hammer Case Ass'y [3], Anvil (L) [6], the hammer
ass'y, and Ring Gear [19] from Housing (A).(B) Set [29].
If the Hammer Case Ass'y [3] proves difficult to remove, tap the tip of Anvil (L) [6] with a wooden
hammer to remove the Hammer Case Ass'y [3].
2. Disassembly of the impact mechanism
(1) Remove Washer (C) [20] from the hammer ass'y.
(2) Set the hammer ass'y on the J-364 washer (A) cradle (dedicated tool, Code No.334413). Press down
the tip of Spindle (A) [17] with a hand press or similar tool to compress Hammer Spring (A) [13]. During
this compression, use a small flat-blade screwdriver or similar tool to take out Stopper (A) [15], and
then release the hand press.
(3) Remove the hammer ass'y from the J-364 washer (A) cradle. Then hold the end of Spindle (A) [17]
and press the tip pawl portion of Hammer (A) [8] with a hand press or similar tool to compress Hammer
Spring (A) [13]. During this compression, use a small flat-blade screwdriver or similar tool to remove
the two Steel Balls D6.35 [7] from the cam grooves of Spindle (A) [17] and Hammer (A) [8], and
through the steel ball insertion groove.
(4) Loosen the hand press, hold Hammer (A) [8] and Washer (A) [14] together, and then pull both out from
Spindle (A) [17]. You can now take out Hammer Spring (A) [13]. Be careful not to allow any of the
twenty-nine Steel Balls D3.97 [9] to fall from the remote portion of Hammer Spring (A) [13].
Fig. 1
[17]
[13]
[15]
REPAIR GUIDE
Disassembly
Push.
[8]
[14]
J-364 washer (A) cradle
(Dedicated tool)
SELLING POINTS
[17]
Hammer click
[8]
-1-
Spindle cam top
[7]