50
4-5
A 36 metre Gullwing Spray Boom is capable of spraying at 24 metres and 12 metres.
Never fold a boom over 24m without the boom first being locked! Prior to any folding operation it would be
advisable to momentarily select the opposite folding direction in order to release the load from the boom locks.
Periodic “loading” of the boom rams during spraying would be an advantage to boom integrity.
A 40 metre Gullwing Spray Boom uses all the components of the 36m boom but with a vertical folding 2m
extension fitted between the break-back fixing plates.
Care
Extra care should be taken to prevent stress damage on this boom.
Although the boom is 50% wider than a conventional 24 metre boom, its stress factor increases by 225% for
any similar operation.
The boom will be damaged by rapid acceleration, rapid deceleration and rapid turns.
All driver actions should be gentle and controlled. High constant spraying speeds will not damage the boom.
Care should be taken when folding a 40m boom. The boom should be lowered to it’s lowest position prior to
vertically folding the 2m ends.
GULLWING SPRAY BOOMS - 36M & 40M Supplement
All booms wider than 24m will have a boom lock fitted as standard. Generally, this is a horizontal ram on the
bottom of the Backframe which will push the boom level to the machine. This ensures the boom will fold
correctly especially if folding is taking place on a side slope.
The boom should be unlocked after unfolding prior to any spraying and locked prior to any folding.
The control for this function is fitted on the armrest. It consists of 2 push button switches. Indicator’s within the
switches will indicate the Boom Lock status.
Occasionally the boom lock will be two hydraulic rams taking the place of conventional shock absorbers. In
this case the boom should be leveled prior to locking before the folding takes place.
In all cases the boom must be unlocked before use.
BOOM LOCK
This feature allows each boom to be inclined upwards by approximately 10° from the 12m hinge and can
improve spraying in valleys or on undulating land. Raising one or both booms will not normally affect the boom
ride but they should be lowered to their rest position prior to folding.
VARIABLE GEOMETRY (INCLINE) - Optional
When engaged, headland control automatically raises the boom away from the crop every time 'spray off' is
operated. This removes the risk of expensive boom damage during particularly awkward headland turns. It is
also one important function (boom lift) which the operator no longer has to worry about. As soon as 'spray on'
is selected, the boom immediately drops to its previous spraying position.
The initial boom working height should be set with both 'headland control' and 'spray on' selected but without
selecting any spray lines.
HEADLAND CONTROL - Optional
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