PNI BPL505S Manual De Usuario página 8

Spring quantity and size
Boom length
≤ 3m
3 - 4 m
4 - 5 m
5 - 6 m
Spring adjustment
1. Losen the screws and remove the cover from the cabinet.
Fig.8
2. Adjust the spring nut (18) according to the weight extracted or added to
the boom. Turn the nut clockwise the higher the weight of the boom is. Turn
the nut counterclockwise the smaller the weight of the boom is. All nuts
must be rotated in the same direction to avoid uneven load distribution.
User manual
Quantity of springs
1
1
2
2
8
Size of springs
Φ4
Φ5
Φ5
Φ5 + Φ6