Figure 12-40.-Wedge socket.
excessive heat), metallic particles, chips or displaced
metal, broken or distorted bearing retainer or seals,
adequate lubrication, and tight bearing caps.
Wire Rope End Connections
Wire rope end connections must be as specified by
The most common type of end
connection used in the NCF is the wedge socket (fig.
Wedge sockets develop only 70 percent of the
breaking strength of the wire rope due to the crushing
action of the wedge. Swage socket, cappel socket, and
zinc (spelter) socket wire rope end connections all
provide 100 percent of the breaking strength of the wire
rope when properly made.
Exercise caution when wedge socket connections
are used to make rated capacity lifts. Wedge sockets are
particularly subject to wear, faulty component fit, and
damage from frequent change outs, and are highly
vulnerable to inadvertent wedge release and
disassembly in a two-blocking situation.
NOTE: Two-blocking is hoisting the
sheaves against the boom tip sheaves.
Wedge sockets must be installed as specified in the
1. Cut and remove any section of wire rope used in
a socket that was subject to sharp bending and crushing
2. Install the wedge socket carefully, so the wire
rope carrying the load is in direct alignment with the eye
of the socket clevis pin. This ensures the load pull is
3. Place the socket upright and bring the rope
around in a large, easy-to-handle loop. Extend the dead
end of the wire rope from the socket for a distance of at
least one rope lay length. Insert the wedge in the socket,
permitting the rope to adjust around the wedge.
4. As a safety precaution, install a wire rope clip on
the dead end of the wire rope that comes out of the wedge
socket (fig. 12-41). Measure the distance from the base
of the wedge socket to the clamp. This measurement is
used as a guide to check if the wire rope is slipping in
the wedge socket.
NOTE: Do not attach the wire rope clip to the dead
end and live end of the wire rope that comes out of the