Maintenance - Filtration / Pump Line filters The line filters are normally mounted on the spray boom as shown on the right. If large jets are being used you may find that the line filters are unnecessary. If this is the case the filter element may be removed completely from the filter housing. To remove the filter simply unscrew the lower bowl and remove the filter element. Ensure the O ring seals are clean and in good order before replacing. Outer boom rests The outer boom rests support the outer boom sections whilst transporting and whilst spraying at 12 metres. It is most important that the rest takes the weight of the outer section when it is folded in. When starting off and climbing hills ensure the outer sections do not move back off the rests or serious damage to the outer hinge points may result. The spray pump The spray pump fitted to your sprayer is a diaphragm type pump and may be one of several different types and/or sizes, however, the operation and maintenance is the same for all of them. Pulsation damper The damper is fitted to smooth out any pulsations in the flow of water away from the pump. For it to work correctly the air diaphragm should be inflated with a hand or foot pump to approx. one third of your normal spraying pressure. Lubrication The oil level should be kept up to the mark on the transparent bowl on the top of the pump. It should be topped up with a good quality 20W/30 motor oil. Change the oil every 200 hrs or at the end of the season. There is an oil drain plug located at the base of the pump body. Rotate the pump shaft slowly by hand until the oil stops flowing. Slowly refill, rotating the shaft by hand again, until the level reaches the mark on the reservoir. If the oil changes to a milky colour this is a sign of water leaking into the oil through the diaphragms - they should then be checked immediately. It is good practice to overhaul the pump; replacing diaphragms, valves and seals at the end of each season if you spray large acreages. < 34 >