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6 - Maintenance
Yaw Damping
The unfolded spray boom will create yaw movements, when:
• Driving over uneven terrain.
• Turning on headland.
• Speeding up.
• Braking.
The three accumulators located in the boom centre act as dampers for
the yaw movements, when driving in the field.
Damping Function
Each accumulator contains nitrogen gas and hydraulic oil, separated by a diaphragm. When the boom makes a yaw
movement, hydraulic oil transfers into the accumulator. The oil pushes the diaphragm while compressing the gas. When this
compression overcomes the oil pressure from the boom, the boom wing moves back to its original position dampened by
the oil flow in the circuit.
Accumulator Service
If the yaw damping seems to be insufficient, recharge or replace the
accumulators. Ask your HARDI dealer to assist you.
1. Check for any leaks.
2. Check pressure setting for the accumulators using the test sockets,
which are located in the hydraulic block (B). Hydraulic hoses for the
accumulators also connects to this block.
3. Fill nitrogen gas (N
) into the accumulators (A):
2
• Gas pressure = 12 bar -0/+2 for booms of 24-28 meters.
• Gas pressure = 18 bar -0/+2 for booms of 30-39 meters.
• The gas volume in the accumulator is approx. 0.5 litres.
4. Fill hydraulic oil into the accumulators (A):
• Oil pressure (B) = 20 bar -0/+2 for booms of 24-28 meters.
• Oil pressure (B) = 35 bar -0/+2 for booms of 30-39 meters.
€
DANGER! Do not fill the accumulators with other gases, such as air or pure oxygen. Risk of explosion.
μ
ATTENTION! When the boom unfolds, the accumulators are
automatically loaded by 35 bar pressure.
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