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Item Inspection Methods Discard limit/criteria Measures
(2) Flaws Check visually. ･ No deep flaws. Replace.
(3) Bend at shank of
bottom hook
Check visually. ･ Never use if bent. Replace.
(4) Bottom hook
movement
Turn hook. ･ Hook should turn lightly. Replace.
(5) Deformation of
lower metal fitting
Check visually. ･ Should be free from deformation. Replace.
(6) Chain container
damage
Check visually. ･ Screws and pins should not be
loosened or damaged.
･ No invasion of foreign matter.
Replace.
Repair.
(7) Hook latch Check visually. ･ No deformation from original
shape (at time of purchase).
Replace.
(8) Rotation of idle
sheave
Turn idle sheave by
lifting the load chain
up and down, as
illustrated.
The idle sheave rotates smoothly.
Inspect and repair if
rotation is not
smooth.
5.
CHAIN SPRING AND
CUSHION RUBBER
(1) Chain spring
deformation
(Option)
Check visually.
NEVER use deformed chain
spring as illustrated or
unspringy one, and make sure
that the size of free chain
spring is the minimum of
75mm (130mm), the initial
size of the spring is 85mm
(150mm)
* ( ): 60-240kg
Replace chain spring
with a new one if
deformed.
(2) Cushion rubber
deformation
Check visually. NEVER use a cushion
rubber if it is deformed as
illustrated.
Replace cushion
rubber with a new
one if deformed.
6. ELECTRIC CABLE
(1) Damage of electric
cable
Check visually.
･ No damage.
Replace.
(2) Loose of electric
cable connection
Check visually. ･ No loosening. Repair.
(3) Poor grounding Check visually. ･ Should be grounded. Ground.
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