Troy build pressure washer good water flow but when applied pressure stals motor

have you disconnected the hose where it attaches to the pump? Many times you will get a build-up of sediment at the screen filter at the pump

Bad pump

Could also be crack/leak in HP pump. If it were left in cold weather without antifreeze, I'd check there first. Part + labor might warrant new washer if more than a couple years old.
Sorry.

There is probably a bypass valve in the pump not working correctly causing pressure to build up inside the pump, not releasing , and putting the motor under strain until it dies.

Looks like the pump has failed; most times caused by freeze damage. If you store over the winter, you need anti-freeze in pump.

stuck valves inside the pump will stop water flow

When you start the pressure washer, having the water from the faucet at full pressure, apply pressure to the triger gently....this should allow the system to release the pressure gradually and keep up.....when you pull the trigger full throttle, it can cause the jurking sensation in system. If this does not resolve the problem you may have a bad empeller pump and requires replacement. Do not allow the pressure washer to run for more than a couple of minutes without water flowing thru is as this will burn up the motor )empeller pump). Good luck

check the non-return valves in the pump block. if these are damaged or dirty you pressure will be greatly reduced. they are located behind the 3 lage brass hexagonal caps.

I hope this helps

I have a Troybilt Model 2200 PSI Pressure Washer in which I have used only 2 times in the past 2 1/2 years. Went to use it this past weekend and the pump in not working. Water shoots out of the side. I bought this brand and model as I thought Troybilt was suppose to be so good. Went back to where it was purchased and had no success but to say I could buy another pump or take it in to be repaired. I believe that this power washer should be replaced at no charge. 2 uses does not constitute a few hundreds of dollars.
Have you to heard anything concerning pump problems on this particular model? Thanks for any advice. .

check the water intake, is it clogged, check all your connections are connected properly and check that there is a good flow of water coming from the output of the water valve.
hope this helps,
joey!