6 - Maintenance149Boom Wings ForwardThe boom wings are adjusted from factory to tip a little forward in thedriving direction, when the boom is completely unfolded.This will help the boom wings stay in front of, or aligned with, the boomcentre during spraying, as the boom will move a little back and forthwhen driving in the field (yaw movements).Uneven terrain or varying driving speed will magnify the boommovements.If the boom falls behind the boom centre, the center of gravity will alsoshift the wrong way, which can result in inaccurate spraying.The position of the boom tips should be checked occasionally to see, ifthey are pointing forward relative to the boom centre. After many hoursof spraying in the field, the boom will tend to position itself further andfurther backwards when unfolded due to wear.AdjustmentOne boom wing at a time is adjusted.1. Park the tractor and sprayer. Activate the handbrake.2. Unfold the spray completely and turn off the tractor engine.3. Stand near the boom centre.Look across to the opposite boom tip (A) while aligning the sides(facing towards the main tank) of the two vertical boom structures(B) and (C).The boom tip should be just visible, if correctly adjusted.4. If you do not see the boom tip, or you see the most of the boomwing, go to step 5 for adjustment.5. The black disc (D) is positioned to impact the boom structure andstop the boom movement, when the boom wing movesbackwards. On the opposite side of the boom structure, anidentical disc stops the forward movement.Adjust the threaded pin in or out by turning the nut (E) andcounternut to bring the boom wing to the correct position.Adjust the other disc equally the opposite way.Tighten the nuts after adjustment.6. Repeat step 3.
