Published 4-20-2015, Control # 502-01 4-37
RT540E SERVICE MANUAL BOOM
EXTENSION AND RETRACTION CABLE
MAINTENANCE
Do not attempt to work on the boom without experienced
supervision.
NOTE: For more detailed information concerning
maintenance of the extension and retraction
cables, refer to Wire Rope (pg 1-15).
Inspection
Do not attempt to work on the boom without experienced
supervision.
The following information is taken from a National
Consensus standard as referenced by Federal Government
Agencies.
All wire rope will eventually deteriorate to a point where it is
no longer usable. Wire rope shall betaken out of service
when any of the following conditions exist.
• In running ropes, six randomly distributed broken
wires in one lay or three broken wires in one strand
in one lay.
• Wear of one-third the original diameter of outside
individual wires. Kinking, crushing, bird caging, or
any other damage resulting in distortion of the rope
structure.
• Evidence of any heat damage from any cause.
• Reductions from nominal diameter of more than:
• 0.4 mm (0.016-in) for diameters up to and including
8 mm (0.3125-in).
• 0.79 mm (0.031-in) for diameters 10 and 13 mm
(0.375 and 0.5-in) inclusive.
• 1.19 mm (0.047-in) for diameters 14 to 19 mm
(0.5625 to 0.75-in) inclusive.
• 1.59 mm (0.063-in) for diameters 22 to 29 mm
(0.875 to 1.125 in) inclusive.
• 2.38 mm (0.094-in) for diameters 32 to 38 mm (1.25
to 1.5 in) inclusive.
• In standing ropes, more than two broken wires in
one lay in sections beyond end connections or more
than one broken wire at an end connection.
NOTE: DEFLECTION EXAGGERATED
FOR ILLUSTRATION PURPOSES
Boom Alignment
FIGURE 4-99
DANGER
To prevent serious injury or death, always wear personal
protective equipment; i.e., a hard hat, eye protection,
gloves and metatarsal boots.
DANGER
Never handle wire rope with bare hands. Injury to hands
could result.
DANGER
To prevent serious injury or death, always wear personal
protective equipment; i.e., a hard hat, eye protection,
gloves and metatarsal boots.
Reference Only
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