I had a d19 hypro the diaphrams were replaced in May I was using it thursday to spray some ferromec on a new lawn for a new bank. It started "laboring" and stopped I tore it down and it had large cracks and holes in both diaphrams, it had blown all the oil out and sucked full of chemical and the push rods had seazed to the crank shaft.
My chemical supplier looked up the price of parts to fix it and it was going to be almost as much as a new d30 so I ordered a new d30.
My question is why didnt the diaphrams I replaced two months ago last longer it had less then 40 hours on them. Or is it somthing I did wrong?