  In this paper we construct a discrete linear operator $K$ which transforms
$A_2$ Macdonald polynomials into the product of two basic $3\phi_2$
hypergeometric series with known arguments. The action of the operator $K$ on
power sums in two variables can be reduced to a generalization of one
particular case of the Bailey's summation formula for a very-well-poised
$6\psi_6$ series. We also propose the conjecture for a transformation of
$6\psi_6$ series with different arguments.
