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WARNING: Before attempting disassembly, be sure to turn off the power switch and disconnect the
power cord plug from the outlet.
1. Precautions on disassembly and reassembly
[Bold] numbers in the description below correspond to the item numbers in the parts list and exploded
assembly diagram for the Models G 12SA4 and G 12SA4(S), and <Bold> numbers to those for the Models
G 13SB4 and G 13SB4(S).
1. Removal of the armature and stator
(1) Loosen the Tapping Screw (W/Flange) D4 x 20 [51]<51> and pull out the Tail Cover [50]<50>. Remove
the Carbon Brushes (1 Pair) [38]<38> from the Brush Holders [36]<36>.
(2) Loosen the four Seal Lock Screws (W/Sp. Washer) M4 x 14 [7]<7> and remove the Packing Gland
[6]<6> ass'y and Lever Holder [8]<8>.
(3) Loosen the four Tapping Screws (W/Flange) D4 x 25 [1]<1> that fix the Gear Cover [2]<2> to remove
the Armature [24]<24> from the Housing [34]<34> together with the Diffuser [23]<23>. At this time,
check that the Rubber Bushing [33]<33> is fitted in the housing ball bearing chamber.
(4) Carefully wrap the Armature [24]<24> with a soft, clean rag to protect it from being damaged, and clamp
it securely in a vise. Then remove the Special Nut M7 [18]<18> and extract the Gear and Pinion Set
[25]<25>.
(5) Disconnect the four internal wires of the Stator [30]<30> from the Pushing Button Switch [40]<40> and
Brush Holders [36]<36>.
(6) Remove the Fan Guide [29]<29> and Stator [30]<30> from the Housing [34]<34>.
NOTE: • If the Stator [30]<30> is hard to be removed from the Housing [34]<34>, heat the Housing
[34]<34> up to about 60°C to facilitate removal. Then pull out the Rubber Bushing
[33]<33>.
• Each internal wire of the Stator [30]<30> is covered with a glass tube. Do not bend the
internal wires repeatedly and do not peel off the glass tubes when removing the Stator
[30]<30> from the Housing [34]<34>. Otherwise, the internal wires may be disconnected.
• Do not apply excessive force to the terminals of the Stator [30]<30> when removing them
from the Pushing Button Switch [40]<40> and Brush Holders [36]<36>. Otherwise, the
terminals of the Stator [30]<30> may be broken.
2. Removal of the rubber bushing
Insert the special repair tool J-201 spring hook (Code No. 970977) between the Rubber Bushing [33]<33>
assembled in the Housing [34]<34> and the housing ball bearing chamber, and then pull out the Rubber
Bushing [33]<33>.
3. Removal of the dust seal
(1) Insert the hooks of the J-204 bearing puller between the Ball Bearing 698SS [32]<32> and the Dust Seal
[31]<31> and fix the hooks with the wing bolts.
NOTE: Be careful not to insert the hooks excessively.
(2) Put the bearing puller on an appropriate stand. Press down on the armature shaft with a hand press and
pull out the Ball Bearing 698SS [32]<32>.
(3) Pull out the Dust Seal [31]<31> from the armature shaft.
REPAIR GUIDE
Disassembly
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