Hitachi DS 18DMR Service Manual page 31

(5) Reassembly of the drive unit
(a) Fit the protrusion of the Motor Spacer [28] in the concave portion of the Rear Case [18] engaging the
pinion of the Armature and Pinion Set [29] with Planet Gear (A) Set (4 pcs.) [25]. Turn it fully clockwise
viewing from the rear of the Armature and Pinion Set [29] (see Fig. 11).
[28]
Protrusion
(b) Mounting the Shift Arm [19] and the Shift Knob [39] (see Fig. 12).
Mount the Shift Arm [19] to the protruded side of the Rear Case [18]. At this time, insert the protrusion of
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the Shift Arm [19] into the hole of the Rear Case [18] and check that the protrusion is inserted into the
groove of the Slide Ring Gear [21] that is mounted in the Rear Case [18] (see Fig. 5).
Insert the Shift Arm [19] into the groove of the Shift Knob [39] facing "LOW" indication on the Shift Knob
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[39] backward.
Protrusion
[19]
Indication "LOW"
[39]
Groove portion of slide ring gear
[18]
Concave portion
Fig. 11
Protrusion
Concave portion
Fig. 12
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Concave portion
[27]
Top view
Side view