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Class Item Inspection method Discard limit/criteria Remedy
Hoist & Trolley
(2) Grounding
(3) Voltage
measurement
of the
connection
box at
receiving
point
(4) Measurement
of insulation
resistance
Check grounded
point.
Measure with a
voltmeter.
Measure charged
and uncharged
parts with an
insulation
resistance tester.
Grounding resistance should be
100 Ohm or less.
For the collector type, the
trolley-running surface of the
beam is free of insulating
materials, such as paint. Also,
the beam is perfectly grounded.
Voltage is within ± 10% of rated
voltage during rated running (of
the electric chain hoist).
Insulation resistance is 5 M.Ohm
or more.
Ground in
compliance
with local laws
and
regulations.
Remove
insulating
materials.
Check that
both the cable
and power
source
capacity are
appropriate.
Investigate cause
and replace
defective parts.
1. Main body
(1) Casing
damage
(2) Abnormal
sound during
operation
Check visually.
Lift and lower by
suspending a light
load.
Body is free of flaws and cracks.
Motor or main body interior does not
generate vibration, noise or irregular
sounds.
Replace casing
with a new
one if
damaged or
cracked.
If abnormal
sounds are heard,
ask the service
personnel to
inspect.
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