Hitachi D 10YB Technical Data And Service Manual page 11

(3) Disassembly of the second pinion
(a) Place the end surface of the First Gear [5] on a cylindrical jig and press down on the Second Pinion [4] with a
hand press. Then the Second Pinion [4] can be removed (See Fig. 6).
(4) Disassembly of the power source section
(a) Loosen the two Tapping Screws (W/Flange) D4 x 16 [41], remove the Tail Cover [40] from the Housing Ass'y
[32] and then remove the Spring [47].
(b) Disconnect the terminal of the neutral conductor internal wire (transparent) for the noise suppressor coming
from the Controller Circuit Holder [34] from the Housing Ass'y [32] (only the products with noise suppressor).
(c) The Connector 50091 [49] which clamps the internal wire (black) coming from the Controller Circuit Holder
[34] and the internal wire coming from the Stator Ass'y [13] is secured at the protrusion of the Controller
Circuit Holder [34]. Remove the Connector 50091 [49] by lifting the tip portion with a small screwdriver
(See Fig. 7).
Fig. 7
(d) Remove the Brush Holder [28] from the Housing Ass'y [32]. Pull out the terminals of the internal wires (blue
and brown) from the Reversing Switch [48] from the Brush Holder [28].
(e) Remove the Reversing Switch [48] by slightly pushing the protrusion of the Controller Circuit Holder [34] which
holds the Reversing Switch [48]. Be careful not to apply excessive force to the protrusion to prevent damages
to the protrusion.
( f ) Disconnect the two internal wires of the Stator Ass'y [13] from the Reversing Switch [48] terminals.
(g) Loosen the two Tapping Screws (W/Flange) D4 x 16 [36] on the Cord Clip [35] and the machine screw M3.5
on the Switch [46]. Remove the Cord [42] from the Controller Circuit Holder [34].
Press down
Spindle [19]
Gear [20]
Cylindrical jig
18 mm dia.
Fig. 5
Press down
Connector 50091 [49]
(connecting the stator ass'y and the controller circuit holder)
Protrusion of the controller circuit holder
Remove the connector by lifting the tip portion
with a small screwdriver.
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Second Pinion [4]
First Gear [5]
Cylindrical jig
15 mm dia.
Fig. 6