This demonstration guide answers one field question about a worn orifice that cannot build rated psi. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with orifice size against the pump spec. That reading separates a worn orifice that cannot build rated psi from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the nozzle as the primary path. If it is in spec, do not replace the nozzle just to complete a parts list.
Repair the failed system
The usual correction is the nozzle, installed to the documented spec for this complaint.
A demonstration shop records the finding so the next technician is not repeating a guess about a worn orifice that cannot build rated psi.
Stop before you make it worse
Do not drilling a nozzle larger for more flow. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the nozzle is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.