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Be sure to disconnect the power cord plug from the wall outlet before conducting repair. Otherwise, the
motor may suddenly run, posing a very dangerous situation.
1. Precautions on disassembly and reassembly
[Bold] numbers in the descriptions below correspond to item numbers in the Parts List and exploded
assembly diagram for the Model H 41SD.
1. Disassembly of the hammering mechanism
(a) Second Hammer [12], Piston [23] and Striker [20]
Note that the front cover and the cylinder case cannot be loosened. Remove the cylinder case and
the crank case before removing the parts inside the cylinder case.
Remove the Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [28] fixing the Crank Cover [29] and the Hex.
Socket Hd. Bolt (W/Flange) M5 x 12 [41] fixing the Hood [42], then the Crank Cover [29] and the
Hood [42] can be removed from the Crank Case [44]. Remove the Retaining Ring D45 [3] and the
Front Washer [4] fixing the Cylinder Case Cover [6], then the Cylinder Case Cover [6] can be
removed from the Cylinder Case Ass'y [5]. Remove the Hex. Socket Hd. Bolt (W/Flange) M6 x 25
[8] fixing the Cylinder Case Ass'y [5], then the Cylinder Case Ass'y [5], Striker [20], Second
Hammer [12], Damper [14], Damper Washer [13], Hammer Holder [2] and Retainer Damper [1]
can be removed from the Crank Case [44].
As the Piston [23] remains on the Crank Case [44] side, use the retaining ring puller to remove the
Retaining Ring for D10 Shaft [26], and then remove the Connecting Rod [24] from the Crank Shaft
[31]. The Striker [20] can be removed by lightly tapping on the Cylinder [19] with a plastic hammer.
If it does not come out easily, push the disassembled Piston [23] with the Connecting Rod [24]
back into the Cylinder [19], and then quickly pull them apart again. The Striker [20] can come out at
the same time as shown in Fig. 1 on the next page.
REPAIR GUIDE
Disassembly
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