Textron Greenlee Ultra Tugger UT10-2S Instruction Manual page 18

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;
For details on calculating the resultant force for any
angle, refer to IM 1363 (99929988).
Greenlee Tools, Inc.
1.800.561.8187
®
Ultra Tugger 10 Cable Puller and Pulling Packages
Resultant Force Table
(35.6 kN or 8,000 lb Pulling Force)
Resultant Force
27.4 kN (6160 lb)
Typical Resultant Force at Sheave
18
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Angle of Change
Illustration
in Direction
180°
150°
135°
120°
90°
60°
45°
30°
0°
135°
information@itm.com
Resultant Force
in kN (lb)
0 (0)
18.5 (4160)
27.4 (6160)
35.6 (8000)
50.2 (11,300)
61.6 (13,800)
65.8 (14,800)
68.7 (15,400)
71.2 (16,000)