Adjustment Of Breakaway Section; Yaw Damping - Hardi ALPHA EVO II EcoDrive Instruction Book

Adjustment of Breakaway Section

The breakaway section at the boom end will move back or forth, if it hits a stationary object, e.g. a pole or a tree, when driving
with an unfolded spray boom. The spring on the outer section of the boom will pull the breakaway back into place, when
the boom is clear of the object. When spraying, the breakaway may also sway a little if driving on uneven ground.
The spring is preloaded from the factory - but adjustment is needed, if:
• the breakaway is continuously swaying a lot due to a bumpy field (tighten the spring).
• the breakaway has become very hard to move by hand, when the sprayer is at a standstill (loosen the spring).
• reattachment is necessary due to replacement of the spring, cable for spring or other parts.
Steps for adjustment:
A. Turn these nuts to adjust the spring
B. Dimension of preload of the spring. Factory settings is 480 mm. Maximum preload is 550 mm.
μ
WARNING! Risk of squeezing. Keep fingers and clothes away from the spring windings, when adjusting the spring.

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 will be transferred 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 is moved back to its original position
dampened by the oil flow in the circuit.
6 - Maintenance
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