Hardi NAVIGATOR DELTA, Instruction Book, Page: 92 / 120

6 - Maintenance
92
Yaw dampers renewal and adjustment
To ensure optimal damping and stability of the boom, visual control of
the yaw dampers is necessary at regular intervals.
Inspect that the yaw dampers are:
A. Intact (If not, they must be renewed).
B. In a tight position (If not, they must be tightened).
A - Renewal of yaw dampers:
1. Unfold the boom
• To get access to the yaw dampers, the position of the two cylinders
on the centre section must be altered:
2. Remove the bolt (A). The cylinders can now be pushed aside.
3. Screw counter nut (C) inwards and position it against the jag nut
(D).
4. Loosen and remove nut (E).
5. Loosen and remove nut (F), and remove the bolt - on which (F) was
situated - from below. Lift the whole profile part (G) out, to give full
access to the yaw dampers.
6. Remove the shaft containing the yaw damper.
7. Fasten the shaft in e.g. a jig.
8. Loosen and remove jag nut (D) and counter nut (C).
9. Unscrew the yaw damper from the shaft and replace it with a new one. Grease the top of the new damper.
10. Place the jag nut (D) on the shaft again and fasten it against the new rubber damper. Also fit counter nut (C) on the
shaft again.
11. Reassemble in reverse order. Remember to position the nut (C) against the profile now.
12. Carry out the same procedure at the opposite rubber damper.
• Subsequently, the yaw dampers must be equally tightened.
B - Tightening the yaw dampers:
The two yaw dampers are tightened as follows:
1. Loosen nut E.
2. Retain nut C against the profile by a spanner while adjusting the
bolt head I until the yaw damper is fastened.
3. Tighten nut E against the profile again.
μ
ATTENTION! The two yaw dampers must be equally tightened.
Therefore, control that the distance between plate (H) and the
profile is 68 mm for both dampers.