Fluid delivery is low.
Pressure setting too low
Increase the pressure.
Applicator tip/gun is dirty or clogged
Clean or replace tip/gun.
Clamps on hopper elbow are loose
Tighten clamps on the hopper elbow.
Hydraulic motor is worn or damaged
Bring the sprayer to a Graco distributor for repair.
Large pressure drop in fluid hose
Reduce length or increase diameter.