User's Manual

32 The GS550 System
2.6.4 Basic Radius Parameters for a Telescopic Boom Crane
Figure 15 Basic Radius Parameters For A Telescopic Boom Crane
Sheave head length perpendicular (menu 4C17)
• The distance from the head sheave centre to
the boom centreline
(Your measurement)
Sheave radius (menu 4C19)
(Your measurement)
Crane centre of rotation
Boom length: the distance from the boom base
pin to the head sheave centre
Boom base pin
Slew offset (menu 4C2)
• The distance from the boom base pin to
the crane centre of rotation
• If the boom base pin is behind the centre
of rotation this value will be negative.
(Your measurement)