There's still things about this machine I doubt I'll ever really understand. I'm terrible with anything electrical and as you probably guessed not too good with unloaders either! I do know more than I used too though! I'll tell you one other thing I advise is NEVER to leave your old part to be tossed unless you're absolutely certain you can never use it again. I wished I'd kept my old unloader. I would've gotten from point A to point B a whole lot faster! The very first words out of my mouth when they told me my pump was losing pressure and I needed a new pump installed was, "Do you think the unloader could be the problem?" I wished I'd listened to my gut. I knew my pump worked fine when I took it in there.The best part is that you honestly shared your experience here and you will likely save many others the trouble you went through even though you paid professionals to do the work.
Some here think veterans of the industry don't make mistakes because they've been doing it for so long. Truth is we just had to learn the hard way before the internet put a 10¢ professor in everyone's pocket.
I share your pain.I had to buy from Jon Don complete pressure regulator despite the fact that I needed only $8( at that time) part. The bullet( piston) got worn out to the point that needed to be replaced. I called first making sure that part is available. They assured me that part will be waiting for me on arrival. Well, $8 turned in $79.99. Similar situation happened to me more than once, so I stopped visiting them altogether. Works great for both parties. I've learned to have a back up parts on hand ( ordering online from different suppliers) and fix the issues myself.Exactly right! Thing is I didn't know that at the time. All I knew was I had a brand new unloader installed by https://shop.truckmountforums.com and all of the sudden I'm losing pressure. They were trying to get me to spend another 800 bucks for a whole new pump. I should've put 2 & 2 together but I was stimied and didn't know what to make of it. All the mess I went through with the pump was because I, and evidently they, didn't know to take that check valve and spring out which takes all of 2 minutes. Oh well, live and learn right? This really goes back to the issue of being forced to buy parts for my machine that has to come through Hydramaster at 4 to 5 X retail.