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HARDI
®
GAS ENGINE ESTATE SPRAYER OPERATOR’S MANUAL
7.3 Nozzle Filters
WARNING:
NEVER SERVICE YOUR CONTAMINATED NOZZLES
WITHOUT WEARING CHEMICAL RESISTANT GLOVES AND
SAFETY GOGGLES.
Each nozzle assembly is equipped with a 50 mesh filter screen as
standard. A properly maintained suction filter will eliminate plugging of
the screens and nozzles.
7.4 Nozzle Tubes and Fittings
Poor seals are usually caused by:
• Missing O-rings or gaskets
• Damaged or incorrectly seated O-rings
• Dry or deformed O-rings or gaskets
• Foreign materials
Therefore, in case of leaks; DO NOT overtighten any fittings (Fig 5).
Disassemble, check the condition and position of the O-ring or gasket,
clean, lubricate and then reassemble. For radial seals (O-ring) (Fig 5),
only hand tighten the fittings. Do not use pliers or wrenches.
The O-rings need to be lubricated ALL THE WAY AROUND before
fitting on to the nozzle.
HARDI
®
recommends using a vegetable based oil to prolong the life of
the O-ring.
7.5 Pump Maintenance
Changing the valves
Remove valve cover 1 (Fig 6). Before changing the valves 2 (Fig 6),
note the orientation of the valves so that they may be replaced
correctly. It is recommended to use new seals 3 (Fig 6) when changing
or checking the valves.
Fig. 5
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