Hitachi G 10SD2, Technical Data And Service Manual

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(5) Disassembly of the gear (Fig. 5)
1 Loosen the four Seal Lock Screws M4 x 12 [23] <23> fixing the Packing Gland [22] <22>, and remove the
Packing Gland [22] <22> from the Gear Cover Ass'y [4] <4>.
2 Support the bottom of the Packing Gland [22] <22> with a jig, and push down on the upper portion of the
Spindle [25] <25> with a hand press until the end surface of the Woodruff Key [24] <24> contacts the Ball
Bearing [20] <20> and the Spindle [25] <25> cannot be pushed down any more. Be careful not to deform
the Finger [26] <26>.
3 Turn the Packing Gland [22] <22> upside down and fix it, then push down the Spindle [25] <25>.
4 Insert the J-128 gear puller (use of a steel plate is permitted as a substitute) between the Gear [17] <17>
and the Packing Gland [22] <22>, and push down the Spindle [25] <25> with a hand press to remove it.
Replace the Ball Bearing [20] <20> with new one every time should the gear be disassembled
because the stress while pulling out the gear is applied to the Ball Bearing [20] <20>.
[24] <24>
[25] <25>
[20] <20>
[22] <22>
[26] <26>
[24] <24>
[25] <25>
[20] <20>
[22] <22>
Push
[25] <25>
[20] <20>
[22] <22>
[17] <17>
Push
Push
Gear puller J-128
(Steel plate)
Step 4 Step 3
Step 2
Fig. 5
8-2. Reassembly
Push the parts together in the reverse order of disassembly, with the precautions given below.
(1) Generously lubricate the teeth of Gear [17] <17> and Pinion [6] <6> with grease. Rub grease onto the teeth
with your fingers so that the grease reaches each tooth bottom. Note that the Gear [17] <17> and Pinion [6]
<6> if under-lubricated may wear at an faster rate.
(2) Be sure to soak the inner diameter of the Felt Packing [21] <21> with machine oil. Otherwise, its dust-sealing
function will fail to work properly, resulting in an earlier damage of the Ball Bearing [20] <20>.
(3) When replacing the Armature [9] <9> and the Ball Bearing [14]
<14> on the commutator side, press inward on the Dust Seal
[13] <13> while taking care of its direction until the end face of
the Dust Seal [13] <13> hits against the butting surface of the
Armature [9] <9> and make sure that Dust Seal [13] <13>
cannot turn freely. (See Fig. 6)
The Dust Seal [13] <13> is an important element for improved
dust protection of the Ball Bearing [14] <14>. Be sure to use a
new one at every disassembly work of the Ball Bearing [14] <14>.
Armature shaft
Ball Bearing [14] <14>
Dust Seal [13] <13>
Fig. 6
[24]
<24>