  The SU(3)--invariant sector of maximal supergravity in four dimensions with
an SO(8) gauging is uplifted to $D=11$ supergravity. In order to do this, the
SU(3)--neutral sector of the tensor and duality hierarchies of the $D=4$ ${\cal
N}=8$ supergravity is first worked out. The consistent $D=11$ embedding of the
full, dynamical SU(3) sector is then expressed at the level of the $D=11$
metric and three-form gauge field in terms of these $D=4$ tensors. The
redundancies introduced by this approach are eliminated at the level of the
$D=11$ four-form field strength by making use of the $D=4$ duality hierarchy.
Our results encompass previously known truncations of $D=11$ supergravity down
to sectors of SO(8) supergravity with symmetry larger than SU(3), and include
new ones. In particular, we obtain a new consistent truncation of $D=11$
supergravity to minimal $D=4$ ${\cal N}=2$ gauged supergravity.
