Hardi Mercury Covamax series Operator's Instruction Manual

7 - Fault Finding1. 1Operational ProblemsIntroductionIn most cases where faults are experienced the most commonly accepted diagnostic approach is to rule outpossible causes systematically by a process of elimination. As a rule this process can begin by investigating thefollowing factors which have previously been found responsible:• Minor leaks on the suction side of the pump will reduce the pump capacity or stop the suction completely.• Pressure filters becoming blocked will result in rising pressure at the pressure gauge but falling pressure atthe nozzles.• Foreign material which has found it’s way to the pump valves will reduce pump efficiency.• Poorly re-assembled pumps, will allow the pump to suck air resulting in reduced or no fluid capacity(investigate this if the pump was recently overhauled / serviced).• Contamination of the hydraulic system will result in rapid wear to hydraulic components.It is good practice to start by checking these basics:• Filling, pressure and nozzle filters are clean.• Check hoses for leaks and cracks, paying particular attention to suction hoses.• Check gaskets and O-ring seals are present and in good condition.• Check that the pressure gauge is in good working order (accurate calibration and chemical dosage dependson it).• Check the operating unit functions properly (always use clean water for testing)• Flow meter is functioning correctly (further information is given later in this section).PreventionNaturally prevention is the best policy. Regular maintenance protects your investment, maximises sprayerefficiency, minimises expensive down time and risk of personal injury.To achieve the best possible service from your HARDI sprayer always make sure that:• Hydraulic system components are maintained and kept clean (keep hose couplings up out of the dirt andcovered when not in use to prevent moisture contamination).• Proper cleaning and de-contamination is carried out after each spray job and before changing chemicals orcrops. Never put off cleaning until later (crop protection chemicals are much harder to remove once they’vedried out).• Regular and thorough maintenance is carried out on time (see maintenance section of this manual forschedule).