% !TeX program = xelatex

documentclass{scrartcl}
usepackage{pstricks}
usepackage{pst-plot}
begin{document}

begin{pspicture}(-1,-3)(3,2.4)
psaxes[ylabelPos=right](0,0)(3,3.4)
rput(2,1){position ok}
psline[linecolor=red,ylabelPos=right](0,0)(0,-1)(1,-1)
end{pspicture}
%
begin{pspicture}(-1,-3)(3,2.4)
psaxes[yLabels={A,B,C,D},ylabelPos=right](0,0)(3,3.4)
rput(2,1){position not ok}
rput(2,0.5){labels on left side}
psline[linecolor=red](0,0)(0,-1)(1,-1)
end{pspicture}

begin{pspicture}(-1,-3)(3,2.4)
psaxes[ylabelPos=right,Oy=-1](0,-1)(3,2.4)
psline[linecolor=red](0,0)(0,-1)(1,-1)
rput(2,1){position ok}
end{pspicture}
%
begin{pspicture}(-1,-3)(3,2.4)
psaxes[yLabels={A,B,C,D},ylabelPos=right](0,-1)(3,2.4)
psline[linecolor=red](0,0)(0,-1)(1,-1)
rput(2,1){position not ok}
rput(2,0.5){labels on left side}
rput(2,0){and shifted down}
end{pspicture}

Red Corner for Reference Position
end{document}