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PROBLEM
POSSIBLE CAUSE
No power
Trigger gun valve
No water source
No Flow
Clogged spray nozzle
Clogged inlet filter
Float Valve stuck (optional)
Faulty unloader valve
Incorrect or no spray nozzle
Worn spray nozzle
Debris in valves
Low pressure,
Lance on low pressure
adequate flow
Unloader is not adjusted correctly
Pressure gauge inaccurate
Bad pump packings
Volume Improperly adjusted
Discharge leaks
Downstream chemical injector (Dema)
Loose drive belts
Low pressure, low
Pump not running at rated speed
flow
Stripped pump drive coupling
Defective easy start valve (optional)
Malfunctioning motor or gear
Unloader stuck in bypass
Outlet restriction
Clogged nozzle
Low pressure, low
Nozzle too small
flow - Bogs
Hose restriction
Debris in the system
Small spray nozzle
Faulty pressure gauge
Excessive pressure
Improperly adjusted unloader
Faulty unloader
SOLUTION
Make sure pump is operating. Check drive belts and couplings, make necessary
adjustments.
Check trigger gun, repair or replace.
Ensure water supply is not restricted and hoses are in good repair and not kinked.
Check spray nozzle, repair or replace.
Check inlet filter, repair or replace.
Float valves can become stuck in the "UP" position. Manually dislodge and inspect
for problems.
Remove and check for proper action, repair or replace.
Nozzle should be properly sized for the system. Low pressure indicates that the
nozzle in use is too large.
Replace nozzle when it shows signs of internal erosion.
Clean valves and check o-rings for pits and cracks.
Adjust pressure so the water flows through properly.
Adjust unloader to proper level.
Use a new pressure gauge on a quick connect at outlet to check system pressure
and replace if gauge is faulty.
If low pressure persists, pump packings may need replaced.
If unit has volume adjustment, it may need readjustment.
Look for leaks on the discharge side of system.
Remove the injector and retest system. If the flow is restored, replace the injector.
If belts do not have proper deflection, replace them.
Check engine throttle and see that the motor is rated for the same speed as the
pump.
Inspect coupling and repair or replace.
Check the start or throttle-back valve for proper operation.
Ensure that the motor or engine is working properly.
Piston assembly may be stuck or fouled.
Build up can restrict flow. If water is not flowing freely, flush with garden hose to
isolate the clog or restriction.
Distorted spray pattern can indicate a clogged nozzle.
Ensure nozzle is proper size for the system.
Correct any kinks or restrictions. Replace crushed hoses.
Debris can lodge in the discharge side of the system (valves, fittings, injectors,
filters). Flushing with water may correct it.
Nozzle must be properly sized for the rated flow and pressure. Reset unloader or
pressure relief if nozzle size is changed.
Check the pressure gauge using a properly calibrated pressure gauge on quick
connects at the equipment outlet.
Adjust to the proper pressure using pressure gauge.
Check the unloader action. If it is not working properly, it may need repaired or
replaced.
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