Diagnosis
Worn or incorrect spray tip, or worn pump valves/seals. The 0° (red) tip wears fastest and causes the biggest drop.
How to Fix It
Swap to a different spray tip. If pressure returns with a new or different angle tip, your old tip is worn out. The orifice enlarges over time, reducing pressure.
If That Didn't Work
Inspect the inlet water filter for debris and check that the high-pressure hose isn't damaged or bulging, which can indicate an internal failure reducing flow.
Heads Up
Never use a tip smaller than 15° (yellow) on this machine for extended periods. The 0° tip is for spot cleaning only; using it as your main tip overheats the pump and accelerates wear.