Repair Guide; Precautions And Suggestions For Disassembly And Reassembly Of The Main Body - Hitachi H 65SD Technical Data And Service Manual

9. REPAIR GUIDE

9-1. Precautions and Suggestions for Disassembly and Reassembly of the Main Body

The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded
assembly diagram.
9-1-1. Disassembly
[NOTE] If it is difficult to loosen and remove the fixing bolts, use an appropriate heating device to heat them to
approximately 80 C (176 F).
Disassembly of the Armature Ass'y [74]
(1) Loosen the four M4 x 12 Seal Lock Hex. Socket Hd. Bolts [51], remove the Cap Covers [52], Cap Rubbers
[53] and Brush caps [54], and take out the Carbon Brushes [55]. At this time, be very careful not to lose the
disassembled parts.
(2) Loosen the four M8 x 35 Nylock Hex. Socket Hd. Bolts [25], and remove the Cylinder Case [18]. Next, after
loosening the M8 x 16 Seal Lock Hex. Socket Hd. Bolt [35], the Connecting Rod Ass'y [29] and Crank Washer
[34] can be disassembled. Leave the Striker [22] and Piston [28] as they are.
(3) Loosen the four M5 x 16 Seal Lock Hex. Socket Hd. Bolts [60], and take off Handle (A) [81] and Handle (B)
[86]. Next, loosen the six M6 x 45 Seal Lock Hex. Socket Hd. Bolts [57], and disassemble the Gear Cover
[39] and Counter Gear [62]. Then, by inserting a flat-blade screwdriver or similar tool into one of the air vents
of the Inner Cover [43] and lifting it upwards, the Inner Cover [43], Armature Ass'y [74], Crank Shaft [48], and
related parts can be removed in a single body.
(4) As illustrated in Fig. 13, support the Inner Cover [43] with an appropriate tubular jig, and push down on the end
surface of the armature shaft with a hand press to separate the Armature Ass'y [74] from the Inner Cover [43].
Inner Cover [43]
Crank Shaft [48]
Disassembly of the Crank Shaft [48] section
First, remove the four M5 x 16 Seal Lock Hex. Socket Hd. Bolts [47] which fix the Bearing Cover [46]. Then,
as illustrated in Fig. 14, support the lower surface of the Inner Cover [43] with an appropriate tubular jig, align
an appropriate steel rod with the end surface of the Crank Shaft [48], and press down on the steel rod with a
hand press. The 6205DDCM Ball Bearing [45], Distance Ring (B) [42], Final Gear [41], two Woodruff Keys
[64], and Crank Shaft [48] can then be disassembled from the Inner Cover [43].
Armature Ass'y [74]
Fig. 13
Press the end surface of the armature shaft
with a hand press
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Tubular jig