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If it is a gas powered machine and it cuts out when you release the spray gun trigger, it means that your unloader valve is stuck closed.
It would help to have more information about your machine and your problem. Gas or electric? Does it start up and run fine or cut out a few seconds after starting? Does it cut out when you release the trigger?
Does it cut out while spraying?
Have a helper hold the trigger of the wand open while you try it again. If it starts that way you have a sticky unloader valve in the pump. DO NOT RELEASE the trigger for more than 10 seconds if the engine continues to strain when released! If the engine doesnt run freely when you let go of the trigger, pull it again and shut down the unit!
Add some power steering fluid to your supply hose (about 3 or 4 ounces at a time) and restart the unit with the trigger pulled. Allow the oil to flow through the pump for 1 - 2 minutes for each treatment. Several treatments should make the pump and valve happy again.
I had the very same problem and nobody could help me until I was talking with a co-worker. Its a very easy fix. I couldn't believe it. I did this yesterday and it ran like a charm. You can either replace the head gasket or just by a good sealer to use on your existing gasket or replace it. I use Indian head gasket sealer on mine. The bolts on the bottom were lose causing a loss of compression. If you need more info you can email me (for free) and I will tell you exactly how to do it.
Leaving the engine running for more than two minutes without releasing pressure trigger causes aluminum pump to overheat and causing damage to the purmp, resulting in sudden low pressure. (see page 9 in manual)
Pressing and holding the two centre buttons ie on/off and start/cancel together for a few seconds causes the machine to run in 'test' mode. Doing the same again puts it back to normal wash.
I nearly called an engineer once because my daughter causes it all of the time!