Sounds like the trigger is not closing, best to strip it down and check operation. Probably siezed in the open position.
SOURCE: Foaming in pump oil window
I dont know which comet pump you have, but it is just easier to get a new pump from one of the pressure washer companies on the internet and they sell them on ebay. You can also probably get a better pump that will fit your engine as well. Also, have you tried just changing the oil and not fill it too full? On my 5000 lb washer, if i fill the oil too high when I change the oil, it will foam some. Hope this helps you, Rick
SOURCE: pump loses pressure after you use it a while even
looks like you need a new diaphpragm in the pump unit
SOURCE: northstar pressure washer randomly gives pressure
Hi:
You need to find the bypass (unloader) valve and grease it with a good waterproof grease. Sorry, I cannot find a pic for you
SOURCE: I have a northstar pressure washer with a comet
Normally, it is one of three things.
1.) The high pressure seals are bad
2.) There is debris in the check valves
3.) the unloader is stuck in by-pass.
SOURCE: How do I adjust the
The following link will give you great troubleshooting for all pressurewashers. http://www.pressurewasherservice.ca/serv02.htm
There are several way to increase pressure. Primary way is to turn the pressure regulator knob in the direction to increase tension on the spring. Pressure regulator is located on the pump (or very neer) and usually has a large spring. Sometimes the spring is hidden under a twist knob. If the adjuster seems to be already turned to max then you may need to just change the pressure tip. The tip/nozzle is actually where the pressure is created by restricting the flow of water thru a very small opening. Use a new tip of the same gpm flow that is required by your machine. 18 hp machine has potential for very high pressure and high gallons per minute. Use trouble shooting guide above for more information. Good luck
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