Goldacres Prairie Pro Operator's Manual page 90

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8. When oscillations are complete move the boom
into a perfect centred position as shown below:
9. Check that the pressure gauges in the hydraulic
yaw circuit are reading below 100 bar.
10. Close the hydraulic yaw charge ball valves.
11. Disconnect the bleed hose from the tractor or
external hydraulic source, and then remove the
hose from the in-line test points. Replace the
cover on the test point.
12. Next, see 'Charging Yaw Circuit'.
CHARGING YAW CIRCUIT
When the hydraulic yaw system is installed, or any
components are replaced, the closed loop hydraulic
circuit needs to be bled of any air, the maximum
pressure set, system charged and the booms aligned.
1. Park the machine on a flat level surface, engage
the parking brake and chock the sprayer wheels.
2. Open the boom into the working position and
lower to the minimum working height.
3. Isolate the boom left cylinders by rotating the
Paralift cylinder valves to the off position.
4. Open the hydraulic yaw charge ball valves.
5. Activate the boom lift circuit and maintain
constant pressure for 30-60 seconds. This will
generate maximum hydraulic oil pressure in the
sprayer hydraulic circuit.
NOTE: The pressure reducing valve in the circuit
limits the main hydraulic pressure to 100 bar
entering the hydraulic circuit.
84 - Chapter 9 - Boom
t ent
6. After 30-60 seconds release the lift circuit and
isolate the hydraulic yaw charge ball valves by
rotating them to the OFF position. The pressure
gauges in the hydraulic yaw circuit should be
reading 100 bar.
7. Ensure that the boom is sitting level and aligned
correctly. If one side of the yaw is sitting forward
of the other; OPEN the charge ball valves and
push the boom around to centre the boom and
cylinders. Once aligned CLOSE the charge ball
valves. Check the pressure gauges are still at 100
bar.
Prairie Pro Operator's Manual MY19 - REV 2
Left: Yaw
charge ball
valves in
the OPEN
position.
Left: Yaw
charge ball
valves in the
CLOSED
position.