- Nov 12, 2008
- 8,902
- 3,586
- 113
- Real Name
- Randy Dockins
- Business Location
- United States
This is a new one on me. I'm trying to figure out what's going on with my Comet pump. I took the machine into https://shop.truckmountforums.com Monday and had them work on a few annoyances and the pump was working fine when I took the machine there. They told me after they worked on it that it was losing pressure and needed another 800 bucks to put a brand new pump on. This pump is only about 1-year old installed 5/14/18. What is happening is I can set the pressure to say 500 psi and stand in front of the machine and begin to trigger the wand. As I'm triggering the pressure will continuously drop incrementally. As it runs more you begin to lose the ability to adjust the pressure with the unloader to say more than 300 psi. Where I'm setting it for 300 psi it should be easily over 1,000 psi. Yesterday as I used the machine I had to keep adjusting the pressure just to finish the job and sometimes the pressure would spike and bury the needle to 1,500 psi. At this point I'm pretty sure I have some damaged seals, probably the high-pressure ones. The pump doesn't pulsate and I am pretty sure there are no obstructions in the line or inside the pump. I think the seals may have been damaged due to the fresh water pump going out and not feeding the machines' tank. I think it was bottoming out. Any advice would be appreciated.