Spray Tech 1420 airless paint sprayer (trying to find the problem)

So at the end of the video I've come to the conclusion that this thing needs to be re packed and or needs a new piston. I'm pretty sure it just needs re packed I will make a video of the repacking process in the near future.

[@tex_mex-car-tel]

Thank you. Perfect

[@dannyschacht4274]

great video...thanks...now I know where to start...

[@baltazarferreyra]

Hello, good afternoon, how do you change the drain valve?