Hitachi DB 10DL Technical Data And Service Manual page 19

(5) Mounting the power supply unit to the drive unit
Mount the Motor Spacer [29] to the Motor [30] fitting its cylindrical protrusion in the hole of the Motor [30] as
shown in Fig. 9. (Fit the protrusion of the Motor Spacer [29] in the concave portion of the Gear Case [12]
and turn it clockwise to secure.) Pay attention to the mounting direction of the Motor [30] and the Gear
Case [12] when mounting the Motor [30] to the Gear Box Ass'y [1]. Mount the Motor [30] so that the red
mark on the Motor [30] is positioned to the top when mounted to the housing (Fig. 10).
Fig. 9
Motor Spacer [29]
Fig. 10
(6) Mounting the Clutch Dial [6]
The Nut [8] has three protrusions. One of these protrusions is wider than the others. The Clutch Dial [6]
has three concave portions inside. One of these concave portions is wider than the others. Mount the Nut
[8] to the Clutch Dial [6] aligning the wider protrusion of the Nut [8] with the wider concave portion of the
Clutch Dial [6]. The wider concave portion in the Clutch Dial [6] is at the position indicated with "1" on the
outside of the Clutch Dial [6] (Fig. 11).
Fig. 11
Nut [8]
Protrusion
Protrusion
Motor [30]
Gear Case [12]
Motor Spacer [29]
Wider protrusion
Protrusion
Hole
Do not insert in these holes.
Red mark
Motor [30]
Indicated with "1"
Clutch Dial [6]
Wider concave portion
Concave portion
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Concave portion