111
Hook
Symptom Cause Remedy Main factor Countermeasure
Widened Hook
opening
Deformation of the
Hook
Replace the Hook if the deformation
exceeds the criteria. (See P70.)
Over load Use the electric chain
hoist with a load less
than the capacity.
Earth lifting Do not carry out earth
lifting.
Be careful not to
impede the Hook
with protruding object
during lifting.
Slinging a load at the
tip of the Hook.
Lateral pulling of the
Hook
Sling a load at the
center of the Hook
Improper slinging Angle formed by two
slings must be 120
degrees or less.
120 degrees or less
Use of the sling with
a size improper to the
Hook
Use the proper sling.
Twisted hanging of
the Hook
Use of the Hook with
the Load Chain wound
on a load
Do not wind the Load
Chain directly on a
load.
Hook unable to
swivel smoothly at
the neck
Rusting shut or
corrosion of Bearing
Swivel the Hook at the neck by hand. If it
is difficult to swivel smoothly, overhaul or
replace the Bearing.
Insufficient grease
application, corrosion
due to environment of
use
Apply grease regularly.
Use the sling to avoid
the dipping of the Hook
into chemicals.
Damaged Bearing Intrusion of dust Be careful about the
intrusion of foreign
matter into the neck.
3
Troubleshooting Hook
(to be continued)
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