Lift up a grounded
load. Press the
button and check
from the outside
that the motor
rotates.
After confirming the
function of Friction
Clutch, don't keep
slipping longer than 5
seconds.
Lift up the rated
load.
− 44 −
Class Item Inspection method Discard limit/criteria Remedy
Hoist & Trolley
3. Friction
clutch
(1) Function The motor should rotate.
The rated load should be lifted up.
If the motor
fails to rotate,
ask the service
personnel to
inspect.
Never adjust the
friction clutch and
replace the
friction clutch as
needed.
If not, ask the
service
personnel to
inspect.
Never adjust the
friction clutch and
replace the
friction clutch as
needed.
4. Limit switch
(overwind
limiting
device)
(1) Limit lever
and cross
guide damage
(2) Stopper
damage
(3) Function
Check visually.
Check visually.
Suspend the rated
load and operate the
limit switch until
the bottom hook or
stopper reaches
the limit lever.
The limit lever and cross guide are
free of damage and deformation.
The stopper, and cushion rubber or
chain springs at chain ends are not
deformed or detached.
The chain spring should give
sufficient allowance of chain after the
motor has stopped.
(For the position of the limit lever,
refer to item 3 in the figure entitled
"Daily inspection".)
Replace with
new ones if
damaged or
deformed.
Replace with
new ones if
damaged or
deformed.
If there are
any
abnormalities,
ask the service
personnel to
inspect and
repair them.
Refer to the name plate AB or AC (written "Upper Limit" or "Upper/Lower Limit")
which is attached on the hoist to determine which types limit switch are equipped
with the hoist. No name plate means no limit switch.
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