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1-1-4. Disassembly of the Pinion and Gear
(1) Loosen the M7 Special Nut [5] for G 10SG (M6
Special Nut <5> for G 12SG) on the Armature [10]
< 10 > , and remove the Pinion [6] <6>.
(2) Loosen the four M4 x 12 Seal Lock Screws [24]
<24> which fix the Packing Gland [23] <23>, and
remove the Gear Cover Ass'y [4] <4>.
(3) As illustrated in Fig. 5, support the outer
circumference of the Gear [18] <18> with a J-129
Gear Puller
(Special Repair Tool, Code No. 970905), and push
down on the upper portion of the Spindle [26] <27>
with a hand press to separate the Gear [18] <18>
from the Spindle [26] <27>.
1-2. Reassembly
Put the parts together in the reverse order of disassembly, with the precautions given below.
(1) Generously lubricate the teeth of Gear [18] <18> 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 [18] <18> 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 [22] <22> with machine oil. Otherwise, its
dust-sealing function will fail to work properly, resulting in an earlier damage of the Ball Bearing [21] <21>.
(3) When replacing the Armature Ass'y [10] <10> and the Ball Bearing [15] <15> on the commutator side,
press inward on the Dust Seal [14] <14> while taking care of its direction until the end face of the Dust
Seal [14] <14> hits against the a butting surface of the Armature Ass'y [10] <10> and make sure that Dust
Seal [14] <14> cannot turn freely. Keep the end face of the armature shaft approximately 0.2mm
(reference) distance inward of the end face of the Ball Bearing [15] <15>. (See Fig. 6)
The Dust Seal [14] <14> is an important element for improved dust protection of the Ball Bearing [15]
<15>. Be sure to use a new one upon replacement.
Fit the Rubber Bushing [16] <16> into the housing ball bearing chamber before installing the Armature
Ass'y [10] <10>. (See Fig. 7)
About 0.2mm (reference)
Armature shaft
Ball Bearing [15] <15>
Dust Seal [14] <14>
Fig. 6
<18>
[18]
Housing ball bearing chamber
Rubber Bushing [16] <16>
About 4.5mm
Fig. 7
−2−
<27>
[26]
J-129 Gear Puller
Fig. 5
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