Hitachi G 18ST Service Manual page 4

2. Removal of the dust seal
(1) Insert the hooks of the J-204 bearing puller between the commutator and the Dust Seal [31] from
both sides, and fix the hooks with the wing bolts.
(2) Place the J-204 bearing puller on a supporting jig and push down on the armature shaft with a hand
press to remove the Dust Seal [31] together with the Ball Bearing 6000VV [32]. Replace the Dust
Seal [31] with new one because it is damaged by the removal of the Ball Bearing 6000VV [32].
3. Removal of the stator ass'y
(1) After removing the Armature [12], disconnect the internal wires connected to the Brush Holders [34]
and the Switch [40].
(2) Remove the Stator [30] from the Housing [33]. If the Stator [30] cannot be easily removed from the
Housing [33], disassembly can be facilitated by heating the Housing [33] to a temperature of
approximately 60°C (140°F) with an appropriate heating device.
4. Removal of the gear and pinion set
(1) Loosen the four Bolts M5 x 16 [23] and remove the Packing Gland [22] together with the Spindle
[20] and the gear of the Gear and Pinion Set [29] from the Gear Cover Ass'y [4] in a single body.
(2) Remove the Retaining Ring [15] from the Spindle [20].
(3) When it is necessary to remove the gear of the Gear and Pinion Set [29] from the Spindle [20], it is
highly recommended that the special repair tools described below are utilized.
Fig. 4
[15]
Push.
[20]
Gear of the
Gear and Pinion Set [29]
[22]
Sleeve
-3-
NOTE: Place the assembly on a sleeve that
matches the dimension of the Packing
Gland [22] and push down on the top
of the Spindle [20] with a hand press
to remove the gear of the Gear and
Pinion Set [29] as shown in Fig. 4.