The pressure gauge is vital for indicating whether the nozzles are delivering the correct amount of chemical per unit time while spraying. If you have any doubts about the pressure gauge, replace it or refer the problem to the manufacturer or supplier. Have two or three sets of nozzles in stock to meet different spray qualities at different volume rates. Inspect nozzles throughout the season to avoid faults which could prove both costly and damaging to the environment if they develop unchecked. Using water only, set to 'spray' at the specified pressure and collect the output from each nozzle in turn for a period of 60 seconds.
All controls move freely and are fully adjustable.
Pressure gauge reads zero. Pump can be turned over by hand. Drain plugs and clean filters are in position. Consult pesticide product labels for rates, application instructions, and safety precautions. The label is the law.