This is just an observation. Looking at the back side of the plastic box, there are bars moulded into the box to keep the inlet fitting from turning. That means the manufacturer must have assembled the inlet from the outside. Maybe it can be unscrewed from the outside and then you could implement your repair without spinning the pipe/barb joint. You would need a second person to hold a wrench on the inside when unscrewing the fitting on the outside, as those plastic bars would not be able to resist wrench pressure during assembly or disassembly. If the manufacturer pressed the fitting together rather than threading, this method wouldn't work.
Just a thought.
Its too bad it wasn't a quality build from the onset. Mine failed after 1 year. I've bought a replacement, haven't yet installed it. I'm also thinking of putting a shut off valve on the pump supply side so water cannot get into the pump when on city water...
I realize this is a bit old but signed up just to say thanks.
Your step by step was great and I realized my blunder and easily fixed my check valve today in only a few minutes.
I actually smirked when I attempted the fix after reading this, for when i pulled out the spring and o-ring, in my hand sat an exact replica of the 'wait a minute, the o-ring isn't supposed to be in the middle of the spring' schmozz. Identical. It was in some ways a relief.
My plumbing simply screws the water hose with a swivel connector to the valve housing so it went on and off in seconds once I removed the front cover. Stuffed a paper towel in behind the valve to hold the rod forward as I used the needle nose pliers to get the spring and plastic holding ring back on. Great tips on the fix and great explanation.
Won't make the mistake of depressing the valve while pressurized again.
Thanks for taking the time to post. Saved me time and money. Especially had I gone to the dealer with a shrug.
Great tutorial. Only problem is it was impossible for me to crack that compression fitting without destroying everything around it or cracking the fiberglass body. Have to live with a broken check valve or remove the entire assembly (rivets and all) and do a complete replacement.