17
HOOK & CHAIN INSPECTION
Repeated use over a long period of time will cause the hooks and load chain to wear or elongate, and corro-
sion and/or cracks may arise depending on the place and method of use. The hooks and load chain are vital
components of the hoist that must be within the permissible limits of the following tables.
Hooks
Measure dimension "A" of the new hook with a slide calipers, and write it down for future reference.
The hook must be replaced immediately when one of the following limits are exceeded:
•
When deformation is visually noticeable (elongation, twists, cracks, etc.)
•
When the limits of Table 11 are exceeded.
•
When dimension "A" differs from the above recorded value for future reference of the new hook.
Load chain
Measure the sections of the load chain that come into contact with the load sheave with a slide calipers. Re-
place the load chain when the limits of Table 12 are exceeded. The whole load chain must be replaced even if
one link is extensively worm or deformed.
Model
Rated load
Top hook
Bottom hook
A
Normal
H
A
Normal
H
Normal
Limit
Normal
Limit
MH-5
MHT-5
MHC-5
0.5t
32
31
29.5
23
23
21.9
1t
28
27
25.7
2t
33
35
33.3
33
35
33.3
2.5t - 3t
41
42
39.9
41
42
39.9
5t
48
55
52.3
48
55
52.3
Model
Rated
load
Type
P
0 d
Normal
Limit
Normal
Limit
MH-5
MHT-5
MHC-5
0.5t - 1t
0 7.1
21.2
21.8
7.1
6.4
2t - 5t
0 11.2
34.3
35.3
11.2
10.1
Table 11 (mm)
Table 12 (mm)
