At The Sheaves - Textron GREENLEE Ultra Tugger 6800-22 Manual De Operación

Cable Pulling Principles (cont'd)
Cable Pulling Forces (cont'd)

At the Sheaves

Sheaves are used to change the direction of the pull.
A change in direction creates a new resultant force
that may be greater than the cable puller's maximum
pulling force. This new resultant force exerts itself on the
sheaves, sheave anchoring system, and support struc-
tures illustrated.
The resultant amount of force depends on the angle of
the change in direction. A brief table is provided here.
Refer to "Calculating the Hook Load" to determine the
resultant force at any angle.
Greenlee / A Textron Company
6800-22 Ultra Tugger
Resultant Force =
27.4 kN (6160 lb)
Typical Resultant Force at Sheave
19
Cable Puller and Pulling Package
®
Resultant Force Table for the Ultra Tugger
(35.6 kN or 8000 lb Maximum Pulling Force)
Angle of Change
Illustration
in Direction
35.6 kN
(8000 lb)
135
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Resultant Force
kN (lb)
180° 0 (0)
150° 18.5 (4160)
135° 27.4 (6160)
120° 35.6 (8000)
90° 50.2 (11,300)
60° 61.6 (13,800)
45° 65.8 (14,800)
30° 68.7 (15,400)
0° 71.2 (16,000)