Boom Suspension System

The spray booms of the 700 series trailed sprayers are fitted with a central pendulum and anti-yaw boom suspension system. This boom leveling system allows for working on uneven ground (compensating for vertical movements) and reduces yawing of the spray boom (horizontal movements).

The central pendulum boom suspension (A) with shock absorbers (C) ensures that the machine can rotate around its longitudinal axis with minimum effect on the spray boom. The spray boom will therefore remain horizontal, if properly adjusted.

Yawing of the spray boom is avoided due to the complete suspension frame being held in a large hinge point (D) and the spherical joint at position (A). This allows the machine to move around its vertical axis in relation to the spray boom, without causing the spray boom to yaw. Polyurethane dampers (E) work as shock absorbers for the anti-yaw system.

A-Spherical joint at pendulum system and anti-yaw system
B-Swivel
C-Shock absorbers of pendulum system
D-Anti-yaw system
E-Polyurethane dampers (anti-yaw system)

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• There should be minimum contact pressure between the rolls of the guiding system (A) and the spray boom (B) for the pendulum system to function effectively.

  Take note of the following points in order to achieve this:

• The machine must be coupled to the tractor in such a manner that the machine does not lean forwards or backwards.
• The spray boom must be aligned straight, refer also to "Spray Boom Alignment" in the section "Adjustments".

During spraying, spray boom movement can be minimized by heeding the following advice:

• Drive at a regular speed.
• Limit steering movements.
• When turning, do so smoothly.
• Switch off the automatic tracking system (optional) during spraying.

A-Guiding roll of pendulum system
B-Spray boom center section

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A boom suspension kit is delivered with the sprayer for working on slopes. This kit is recommended for slopes of more than 5%. It contains two springs (A) which are fitted to the suspension system in addition to the shock absorbers. The springs ensure that the spray boom will follow the slope better, without having to operate the boom tilt correction too much. The boom suspension will be slightly less sensitive, but pendulum action still remains possible. The springs can be fitted or removed according to the field conditions.

The springs are designed for working on hilly fields and therefore should be removed for working on flat fields. Also see "Adjusting the Boom Suspension" in the section "Adjustments".

A-Boom suspension kit for slopes

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