Edition 2 Chapter 1 Page 1-38
Feb/2013 Maintenance and Service
• Torsion resistant wire-rope breaks: two steel wires of rope diameter in
less than 0.2 in. (6 mm) or four steel wires of rope diameter in less than
1.2 in. (30 mm).
• A break in the wire-rope on the external rope layer at the core position
(causes rope core to extrude or in circle).
• The thickness (diameter) of one wire-rope on the external layer is less
than 2/3 of its usual thickness (diameter).
• Wire-rope that is not usual: distortion, flattened or broke wire nests etc.
• Wire-rope with an area of damage because of too much heat.
• If the wire-rope has an area that you think is not as thick as it must be,
you must replace the rope. Use the data that follows to examine the rope:
Inches Millimeters
Rope Thickness D Maximum Loss Rope Thickness D Maximum Loss
≤ 0.3 0.02 ≤ 8 0.4
0.4 to 0.5 0.03 9.5 to 13 0.8
0.6 to 0.7 0.05 14.5 to 19 1.2
0.9 to 1.1 0.06 22 to 29 1.6
1.3 to 1.5 0.09 32 to 38 2.4
• Wire strand breaks: two out of the rope connection or one at the rope
connection.
(2) Wire-Rope Replacement
(a) Make the crane level on a hard surface.
(b) Fully retract the boom.
(c) Lower the main hook and set it on the ground.
Figure 1-25 Hook on the Ground
To Next Page
Loading...
Need help?
General
