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Maintenance - General
Pressure Relief Valve
The pressure relief valve provides relief when the
pressure exceeds a pre-determined value. Altering
the adjusting stem will affect the setting at which
the relief valve will come into operation. Turning
the stem clockwise will increase the pressure
relief setting. Goldacres pre-sets the pressure to
approximately 110 PSI and this should not be
altered. To check or alter this setting, turn the pump
OFF and turn relief valve counter clockwise. Turn the
solenoids OFF, and then close all control manifold
ball valves so that all flow passes through the relief
valve. Run the pump at maximum operating speed
(540 RPM) and slowly turn the relief valve clockwise
until the pressure is achieved. Tighten the nut on
the adjusting stem so that this setting is maintained.
If the relief setting is too low, excessive flow will be
allowed to bypass back to the tank and it will limit
the maximum obtainable pressure.
Pump
8 HOURS
Check pump oil level and condition.
50 HOURS
Pump oil should be changed after the first of 50
hours of operation.
Pump oil level should be between the two
level markers on the oil reservoir. If the oil level
continually gets low or is turning milky, there is
possibly a split in a diaphragm. The oil will need to
be drained and all the diaphragms replaced. Use SAE
15W40 oil. Rotate the pump manually (by hand) to
remove any air locks while filling. Do not over fill.
Grease pump PTO shaft; shaft universal nipples and
telescope nipple must be greased every 8 hours. The
cover must be greased every 40 hours to ensure it
spins freely on the shaft.
250 HOURS
Change Pump oil; pump oil should be changed every
250 hours. Use SAE 15W40 oil. The oil drain plug
is located between the two pump mounts on the
underside.
SEASONALLY
Check pump air accumulator (where fitted). The air
pressure in the air accumulator must be maintained
to the correct pressure (approximately half of
Prairie 1500-3000L Operator's Manual MY17-MY19 - REV 0
the spray pressure). If the accumulator constantly
loses pressure, the valve or diaphragm may need
replacing. To recharge the accumulator, charge it to
approximately half of the spray pressure then run
the pump at normal operating RPM. Looking at the
pressure gauge, release some pressure until there is
as little pulsation as possible. This will ensure a very
even and constant pressure delivery.
Chassis, Wheels, Tyres & Axles
8 HOURS
Check tyre pressure; it is very important to maintain
correct tyre pressures to optimize sprayer stability
and the load rating. To determine the required tyre
pressure, refer to the tyre specification chart in the
general information section of the operator manual.
If the tyre has a constant leak, the valve may be loose
or need replacing, or the tyre may have a puncher.
Wheel nuts must be checked every 8 hours and re-
torqued to 320 ft/lb if required. Follow the sequence
below to ensure an even torque distribution.
7
3
9
5
Above: Follow this tightening sequence to ensure
even wheel nut torque distribution (320 ft/lb).
25 HOURS
Grease the wheel bearings; grease is applied to the
ADR axle via a grease nipple on the front of the hub.
150 HOURS
Check wheel bearings for sideways movement; to
check the wheel bearings for free play, jack up that
side of the sprayer until the wheel can spin freely.
Rock the wheel from side to side. If the is any
movement the bearings will need to be tightened or
replaced.
Chapter 10 - Lubrication & Maintenance - 63
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