Hitachi WR 25SE Service Manual page 3

2. Removal of hammer spring (C)
Using a hand press, push down the raised portions of Hammer (D) [11] to compress Hammer Spring (C)
[17] fully. In this position, use a small flat-blade screwdriver to extract the two Steel Balls D10.3 [13] from
the cam grooves of Spindle (C) [20] and Hammer (C) [14]. Then slowly release the hand press and
remove Hammer (C) [14] from Spindle (C) [20] to remove Hammer Spring (C) [17].
NOTE: Be careful not to lose the thirty-five Steel Balls D4.76 [15] and Hammer Washer (C) [16]
mounted between Hammer (C) [14] and Hammer Spring (C) [17].
Fig. 2
[14]
Fig. 3
[12]
[13]
[22]
[23]
[24]
[20]
[14]
[15]
[16]
[25]
[27]
Raised portion of the hammer
Top of the spindle cam
[13]
Steel ball guide groove
[17]
[18]
[19]
-2-
[20]
[21]