Hitachi H 25PV Technical Data And Service Manual page 16

Demolition hammer

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Inside cylinder disassembly

Remove the Striker [33] and the Slide Ring [32] from inside Cylinder [24] (Fig. 13). Remove the Stopper Ring

[31] from the groove inside Cylinder [24] by striking the Stopper Ring [31] through the hole provided on

Cylinder [24]. Next, take out the Stopper Ring [31] from inside Cylinder [24] by the spring hook (J201,

No. 970977). Then the Damper Holder [30], Damper [29], Damper Washer [28] and Second Hammer [26]

can be removed from the Cylinder [24] (Fig. 14).

Punch

Cylinder

Second hammer

Slide ring

Striker

Damper washer

Fig. 13

Spring hook

Stopper ring

Damper holder

Damper

Fig. 14

Piston disassembly

Remove the Seal Lock Hex. Socket Hd. Bolts M4 x 12 [43] fixing the Crank Case Cover [42], then the Crank

Case Cover [42] can be removed from the Crank Case [46]. Move the Crank Shaft [40] to the bottom dead

center then the piston ass'y can be removed from the Crank Shaft [40] (Figs. 15 and 16).

Crank case cover

Crank case

Connecting rod

Crank shaft

Piston

Fig. 16

Crank shaft

Connecting rod

Fig. 15

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