Maeda MC405C-3 - Inspecting Wire Rope; Winch Wire Rope - Correcting Twisted Rope

Section 5 – GENERAL MACHINE MAINTENANCE Mini-Crawler Crane M A E D A
5-66 1/2019 MC405C-3
Inspecting Wire Rope
A wire rope undergoes wear and tear over time.
Prompt replacement is required if any of the
following events appears in the wire rope.
• 10% or more of strands (except a filler wire) in
a twist of the wire rope (6 crests) is broken.
Fig. 5-154
NOTICE: Replace the wire rope for winching if 9
strands or more are broken and one for boom
extending/retracting if 13 strands or more are
broken.
• Wear equivalent to 7% or more of a nominal
diameter occurs in the wire rope diameter.
Fig. 5-155
NOTICE:
• Replace an 8-mm-dia wire rope if it is 7.5mm in
diameter.
• Replace a 10-mm-dia wire rope if it is 9.3mm in
diameter.
• A kink is formed.
Fig. 5-156
• Considerable deformation or corrosion is
developed.
• A faulty end socket is used.
Winch Wire Rope - Correcting Twisted
Rope
WARNING! Be sure to wear a pair of thick
leather working gloves when handling wire
ropes.
CAUTION: Change the hooking direction of
the wire rope (inverse the hook block side
and winch drum side) from time to time to
extend the life of the wire rope.
When the wire rope gets twisted, straighten the
twist with the following procedure.
1. With the hook in normal condition, check the
twisting direction and how many times the
rope is twisted.
Fig. 5-157
2. Operate the winch lever to "DOWN" (push
forward) side to lower the hook block onto
the ground.
If the hook cannot be lowered, operate the
boom derricking lever to the "LOWER" (push
forward) side to lower the boom or operate
the boom telescoping lever to the
"RETRACT" (pull toward you) side to retract
the boom to lower the boom.
3. Turn the starter switch to the "OFF" position
to stop the engine.
Fig. 5-158