Incorrect drive gear selected (Manual Only) – Select correct gear

RPM selection switch set too low – Reset

Dirty water filter – Clean

Incorrect or worn jetting nozzle – Replace

Suction Isolation Valve – Off

Filter isolation valve not fully open – Open

Leaking rotary union/s – Repair/Replace

Regulator has worn valve/seat – Repair/Replace

Pump valves or packings worn – Repair/Replace

Faulty low water switch – Replace

Water leak in water supply – Replace/Change

Hydro Excavation Pump pulsing on and off – Leak in system, hose, rotary union, gun