VIO 35-3 quick coupler hose leak fix. Shims install. 

Quick coupler house is leaking because of to much play in the knuckle.
Order stainless steel washers to fill the gap and keep it from happening again.
Flat Washers 304 SS - 1-1/2" (1.562 ID x 3-1/4 OD x .140
$3.66 AlbanyCountyFasteners.com