
11
Wire Rope
Attention !
Conditions and limits of rope use:
Less than 10% of the elementary strands are broken following twisting (1 step).
The diameter of the wire rope must be reduced by less than 7%.
There must be no bends (folded or twisted rope) or corrosion.
When the wire rope is replaced, fix the end with a stop sleeve.
The stop sleeve (fixed to one end of the rope to prevent the rope and load slipping off the pulley
due to an excessive load) must be complete, without damage, and there must be no risk of the
wire rope sliding or becoming separated from it.
Pulley
Wear in the pulley groove is caused by the wire rope, so the wire rope must also be inspected.
Methods for recognizing the limit values for the pulley groove with the naked eye:
1. After production and heat treatment, the surface of the pulley groove is coated with electric black.
2. When holding the load, the electric black coating becomes worn away to the point when the wire
rope no longer moves at the bottom of the groove.
3. When the equipment is used continuously, the score line moves to the bottom of the groove.
4. There are two reasons for this:
The wire rope diameter is reduced: the wire rope is worn and must be replaced.
The pulley groove is worn: if a new rope touches the bottom of the groove, it is time to replace
the pulley.
※Worn wire rope touching the bottom of pulley groove.
1. Replace the wire rope.
2. Mark the groove with an indelible marker.
※New wire rope touching the bottom of the pulley groove.
1. Replace the pulley.
12
Checking
Classification of checks
Checking Item Checking Method Checking Reference
Daily Periodical
One
month Three
month One
yea
◎ Marking Label and the like Visual Existence of label
◎ Easylift
hoist Exterior Visual No cracks, breaks or significant
deformation
◎ Installation Functional operating
mechanisms Visual To be properly adjusted and free from
unusual sounds when operation
◎
Control/
Switch
Working Function Reasonable actuation
◎ Housing Visual To be free from cracks
◎ Wiring Visual To be free from remarkable loose or
damaged
◎ Cord Visual, electricity To be free from exposure of
conductive wire
◎
Motor
Condition
of insulation
Measure with
resistance tester 1MΩmin
◎ Staining damage Decomposition
chec
To be free from abnormalities
◎
Gear
Damage , wearing Decomposition
check
To be free from remarkable wear and
damage
◎ Lubrication condition Lubricating Have an abnormal sound to be
opened and checked
◎
Drum Exterior Visual No wear or corrosion
◎
wire rope
Broken strands Visual, measuring Less than 10%
◎ Wear Visual, measuring Less than 7% diameter reduction
◎ Deforming or
corrosion Visual Existence of abnormalities
◎ stop sleeve Visual It must be solidly fixed to the end of
the wire rope
◎
Hook
Housing and
mechanical
components
Visual, function To be free cracks, rupture and harmful
deformation
◎ Length stretching Measuring size deformation by 5% maximum
◎ Safety catch Visual To be free from deformed