9.
Fault Finding
Symptom
Possible Cause
Remedy
Pump running normally
Lance in low pressure mode Check and adjust
but pressure low.
Pressure Regulator valve
Check and adjust
Pump sucking air.
Check water supply and
possible air ingress.
Nozzle badly worn
Check and/or replace
Worn piston packing
Seek professional advice
Fluctuating pressure
Blocked water filter
Check filter, clean or
replace if necessary.
Pump sucking air
Check integrity of suction
hose and connections.
Pressure low after a long
Nozzle badly worn
Check and/or replace
period of normal use.
Pump noisy.
Pump sucking air
Check integrity of suction
hose and connections.
Excessive temperature of
Reduce temperature to
liquid in pump
below 60ºC, do not allow
pump to idle for long
periods.
Worn bearing or valves
Seek professional advice
Presence of water in oil.
Ingress through breathers
Replace oil, do not wash
engine or pump
Worn oil seals
Seek professional advice
Water dripping from under pump. Worn piston packing
Seek professional advice
Oil dripping from
Worn oil seal
Seek professional advice
pump/gearbox/engine.
Excessive vibration in
Water supply low
Check adequacy of water
lance/delivery line.
supply. Ensure suction
filter is below water level.
Ingress of air into suction
Check integrity of suction
line
hose and connections.
Irregular functioning of
Seek professional advice
valves
