Hitachi VB 16Y Technical Data And Service Manual page 20

(9) Installation of Final Gear [17] (Fig. 28)
Mount the two Feather Keys 7 x 7 x 25 [46] to the Cam Shaft [12] and gradually press-fit the Cam Shaft [12]
into the Final Gear [17] supporting the end surface of the Cam Shaft [12]. After press-fitting, be sure to secure
the Final Gear [17] with the Retaining Ring for D28 Shaft [18].
Support the end surface.
(10) Installation of gears
Before mounting, apply grease (NPC SEP-3A) to the meshing portions of the gears adequately.
[18] [12]
[17]
[46]
Press-fit.
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[13]
Fig. 28