  We develop a system of equations for the propagators and three point
functions of the $\phi^3$ quantum field theory in six dimensions. Inspired from
a refinement by Ward on the Schwinger--Dyson equations, the main
characteristics of this system are to be formulated purely in terms of
renormalized quantities and to give solutions satisfying renormalisation group
equations. These properties were difficult to get together, due to the
overlapping divergences in the propagator. The renormalisation group equations
are an integral part of any efficient resolution scheme of this system and will
be instrumental in the study of the resurgent properties of the solutions. It
is our belief that this method can be generalized to the case of gauge fields,
shedding some light on their quantum properties.
