Hitachi DS 18DFL Technical Data And Service Manual page 21

(b) Mount the Nut [6] <6> to the Front Case [9] <9>. (See Fig. 6.)
Align the register mark ( ) on the Nut [6] <6> with the register mark on the Front Case [9] <9>. Turn the
Nut [6] <6> about 1-1/2 turns clockwise so that the register mark ( ) on the Nut [6] <6> is aligned with the
register mark on the Front Case [9] <9>. Check that the Y surface of the Nut [6] <6> is aligned with the Z
surface of the Front Case [9] <9>.
Register mark ( )
Y surface
[4] <4>
[5] <5>
[6] <6>
Mounting start position
Z surface
[7] <7>
Notch
Fig. 5
Register mark ( )
Register mark
Y surface
Fig. 6
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[8] <8>
Mounting end position
Register mark
Z surface
[9] <9>