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Class Item Inspection method Discard limit/criteria Remedy
Electric chain hoist
3. Limit switch
(overwind
limiting
device)
Refer to the name plate AB or AC (written "Upper Limit" or "Upper/Lower Limit")
which is attached on the hoist to make sure which types limit switch are equipped
with the hoist. No name plate means no limit switch.
(1) Upper limit
switch
function
Operate the hoist
under no load
condition until
bottom hook
reaches the limit
lever.
When the bottom hook reaches the
limit lever, the motor stops
automatically.
(Limit lever positions during
motor stoppage and operation
are shown below.)
If there are
abnormalities,
ask the service
personnel to
inspect and
repair them.
(2) Upper and
lower limit
switch
function
Operate the hoist
under no load
condition
until bottom hook or
stopper reaches the
limit lever.
When the bottom hook or the
stopper reaches the limit lever,
the motor stops automatically.
(Limit lever positions during
motor stoppage and operation
are shown below.)
If there are
abnormalities,
ask the service
personnel to
inspect and
repair them.
4. Load chain
(1) Appearance
Check visually for
greasing and
twisting.
Load chain is well lubricated.
Load chain is not
twisted or capsized.
If chain is dry,
apply the specified
lubricant in the
section5.1(3).
If chain is
twisted,
untwist it and
restore it to
normal chain
condition.
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