Inspection And Maintenance Of Wire Rope - Mitsubishi Electric UM 5t Instruction Manual

Check the wire rope during daily inspection, and check the rope ends, equalizer sheave and drum
winding part during monthly inspection. If the rope strands have been broken or the rope has
been deformed, immediately replace the rope with a new one. (It is recommended to prepare a
spare rope for replacement.)
Replacing the Rope
Regarding the 2-fall type, remove the pin of the stationary side, and the rope can be removed easily.
The 4-fall type has a tapped hole for hanging in the upper part of the hanger. Lift the hanger
using the tapped hole, and draw out the hanger shaft. Then, the rope can be removed.
For any of 2-fall and 4-fall types, unwind completely the rope on the drum, and the rope can be
removed easily.
* The wire rope assembly is a critical part for strength. This hoist crane (Type M) uses the
Mitsubishi original high strength wire rope. Be sure to use the Mitsubishi genuine wire
rope for replacement. (The genuine wire rope has a stamp of the Mitsubishi mark at the
end.)
* The rope stationary end easily comes off the drum while the wire rope is being replaced.
Tie the rope with a string as a measure to prevent the wire rope from falling when the
rope stationary end comes off the drum.
* When replacing the wire rope, be sure to lubricate the equalizer sheave shaft on the 4-fall
rope stationary side. In addition, after replacement, be sure to check that the wire rope
in the hanger area (hidden area) is not twisted.
Rope stationary side
To remove the hook block cover, loosen the bolts or nuts on the sheave cover sides. In the case
of the 2-fall type, remove the hook sheave. To re-assemble, tighten the mounting bolts and
slotted nuts, and, in the case of the 4-fall type, fit the split pins of the slotted nuts.

Inspection and Maintenance of Wire Rope

Drum side
10t intermediate sheave side
－ 27 －