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Class Item Inspection method Discard limit/criteria Remedy
Hoist & Trolley
5. Load chain
(1) Abrasion To measure pitch
with slide calipers:
Measure at the
point that is most
frequently engaged
with load sheave.
Dimension (P) or (d) shall not
exceed the limits presented in
the table below.
If limit
exceeds,
ALWAYS ask
the service
personnel to run an
inspection.
6. Accessories
(1) Hook
deformation /
twist of hook
opening
Measure dimension
"a" at time of
purchase with slide
calipers.
Check visually.
No deformation from original
shape (at time of purchase)
Twist shall not be large enough
to detect visually.
Replace with
new hook if
deformed.
Replace with
new hook if
twisted.
Chain
size
(d)
Capacity
(kg or t)
Number of
measured
links
Pitch of measured
links : P
Standard Limit
Discard
limit
of (d)
125(H)
250(S)
250(H)
500(L), 500(S)
1(L)
,
1(M)
,
1(S)
1.5,
2(L)
,
2(M)
,
2(S), 3(C)
2.5(S), 5(L)
3(L), 3(S)
5.0
6.3
8.0
10.0
11.2
12.5
5
5
5
5
3
3
75.5
95.5
121.0
151.0
102.6
114.6
77.7
98.3
124.6
155.5
105.6
118.0
4.5
5.7
7.2
9.0
10.1
11.3
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