10
HARDI NAVIGATOR
Remote pressure gauge
The remote pressure gauge measures the working
pressure near the pressure regulator, and is an indicator
of pressure changes within the system.
Note: This pressure reading will vary slightly from the
reading at the distribution manifold pressure gauge.
The outputs stated in the nozzle charts are always based
on the pressure measured at the nozzle.
When calibrating and spraying, adjust pressure according
to readings at the pressure gauge located closest to the
boom.
Fig 17
Filters
Filters should always be used, and their function checked
regularly.
The mesh size of the filter should always be
smaller than the flow average of the nozzles used.
Therefore, pay attention to the correct combination of
filters and mesh size. The recommended suction filter is
50 mesh - this allows good flow to the pump with little
restriction. The standard self cleaning filter is 100 mesh.
Refer to the chart below for correct filter recommendations.
Flat Spray Suction Self Cleaning In-Line Nozzle
Nozzle Size Filter Filter Filter Filter
0075 - 02 80 100 100 100
025 - 03 50 80 80 80 (50)
04 and more 30 80 (50) 50 50
Suction filter screens do wear from dirt and chemical
particles. If nozzle filters continually block with chemical
particles, then use the next size coarse nozzle filter.
Self cleaning filter
IMPORTANT! Note direction of restrictor in Fig 19.
Correct restrictor choice
It is important to have a large flow through the filter. This
is achieved by choosing restrictor size in relation to the
liquid consumption of the spray boom and pump output.
Disconnect the hose (Fig 19) at the self cleaning filter,
place the restrictor in the hose and reconnect.
If the required working pressure cannot be obtained, the
restrictor may be too large. There are four sizes, green
is the largest, then black, white and finally red.
A
B
C
F
E
D
334200 RED 334201 WHITE
334202 BLACK 334203 GREEN
A= From Smart Valves
B= Double Filter Screen
C= Guide Cone
D= To Boom Section Valves
E= Replaceable Restrictor
F= Return to Tank
As standard, units with 363 pumps will be fitted with
Black and 463 pumps with Green restrictors.
Fig 18
Cleaning
When cleaning the filter, remove all hoses and check
there is no residue.
Standard filter size is 100 mesh. Sizes of 50 and 80
mesh are available and can be changed by opening the
filter top (replace the strainer). Check the O-rings before
reassembling the filter and replace them if damaged.
Also refer to 10-HOURLY MAINTENANCE -
Self Cleaning
Filter
, (Maintenance Manual).
Fig 19
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