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The SAM Gullwing folding boom of up to 36 metres in width is based on the well-proven space frame
construction.
The folding mechanism is in-cab controlled with two Finger Tip switches (booms up to 24m) or three Finger Tip
switches for booms larger than 24m
After lifting the boom clear of its rest, both main sections may be opened to 12m. Both sides may then be
opened to their maximum. Folding 'in' is the reverse. If a Variable Geometry boom (Incline boom) is fitted then
ensure that the V/G is lowered fully before folding in.
When Spraying at 24m with a 3 fold boom, ensure that the Boom Lock is UNLOCKED otherwise damage to
the boom may result.
Occasionally independent end fold switches are provided when requested.
Never fold any boom section until the mating section has fully completed its total movement.
A 2-way breakback, usually of 2 metres in length, is incorporated at each boom end. Maintenance spent in this
area is time well spent.
Single boom working is not possible with this boom although the boom may be used quite happily at 12
metres.
This boom normally has a 7 section shut off. Hydraulic, mechanical and pneumatic locking mechanisms are
used to ensure boom integrity and safety.
The anti-yaw mechanism on this boom is based on rubber buffers OR a specialised hydraulic system. No
adjustments are necessary in this area.
Boom straightness affects boom ride and as such, boom straightness should be checked following the
Maintenance Schedule. Adjustment is simple –with the main sections fully open, loosen the hydraulic ram
end and turn the ram shaft in the appropriate direction. Tighten the ram end.
Adjustment should be made to the V/G retaining chain if the boom is not horizontal when in the V/G is in the
fully lowered position. This should take place according to the Maintenance Schedule.
BOOMS SHOULD NEVER BE FOLDED WHILE THE MACHINE IS MOVING.
It is extremely difficult to remove every trace of air from a hydraulic circuit. Every effort is made during
manufacture to remove this air from the hydraulic system but with up to 13 cylinders on a boom, it is inevitable
that air will become entrapped occasionally.
The procedure for bleeding is simple and as follows:
Start engine and run at 1000 rpm.
Simply loosening the hydraulic fittings and pressurizing the appropriate circuit may accomplish the bleeding
of the boom fold cylinders.
It may be necessary to bleed the boom circuits more than once during the first few weeks of use.
The SAM boom suspension system is one of the finest in production with a hydraulic accumulator eliminating
vertical shock loads. A short pendulum with gimbal capability stops tractor roll being transmitted to the boom.
Damping is provided with conventional shock absorbers. Anti-yaw is a standard fitment.
The boom can be contoured, inclined, raised/ lowered and folded hydraulically all from the driver's seat by
electronic control.
The hydraulic spool fitted in the lift/lower section of the hydraulic valve bank is restricted in one direction. This
valve will control the speed of descent of the booms, it will not affect the lifting speed. This valve is pre-set
during manufacture and should not be adjusted.
GULLWING SPRAY BOOMS
4-4
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