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In chart, F indicates Frequent Inspection, P indicates Periodic Inspection
LOCATION
Braking mechanism
Slipping under load
(See Page 4)
Hard to release
Brake Parts
Brake Discs
Glazing
Oil contamination
Pawl; Ratchet
Excessive wear
Pawl Spring
Corrosion; stretch
Load Chain
Stretch
Excessive wear
(See Page 7)
Twist
Broken, cracked, or
damaged links
Deposits of foreign
Inadequate lubrication
Chemical damage
Hooks
Cracks
(See below)
Deformation
5%, not to exceed 0.25 inch
in excess of normal throat
opening
Any twist from plane of
Cracks (dye penetrant,
magnetic particle, or other
suitable detection method)
HOOKS
Refer to ASME B30.10, Safety Standard for Hooks. Inspect hooks and measure hook
throat opening at least once a month. Between regular inspections check visually daily
for deformation, distortion, twisting, damage, and missing or damaged hook latches.
Inspect as follows :
1. Measure hook throat opening from metal to metal of the hook as shown by dimension
N1 in Figure 2. DO NOT measure from latch to metal. Hook must be replaced when throat
opening measurement has increased 5%, not to exceed 0.25 inch over the original throat
opening dimension of a new hook, as follows:
FIGURE 2
CAPACITY
A
Ton
MM
INCH
1/2
73
2.874
1
86
3.386
2
113
4.449
3
133
5.236
5
152
5.984
7
185
7.283
1/2
10
236
9.291
15
270
10.63
20
323
12.72
TABLE 2 - INSPECTION CHART
CHECK FOR
material
unbent hook
STANDARD HOOK DIMENSION
B
E
MM
INCH
MM
INCH
16
0.63
20
0.787
20
0.787
24
0.945
24
0.945
30
1.181
28
1.102
42
1.654
36
1.417
46
1.811
42
1.654
66
2.598
62
2.441
90
3.543
65
2.559
90
3.543
79
3.11
118
4.646
F
P
LOCATION
Hook Retaining
Members (Pins,
Bolts, Nuts)
Hook Latch
Suspension Members
(Sheaves, hand-
wheels, chain
attachments,
suspension bolts
or pins)
Bearing; Shafts
Gears
Load Block;
Suspension Hsg.
Trolley; Supporting
Structure
Bolts, Nuts, Rivets
WARNING Label
M
MM
INCH
MM
36
1.417
27.5
40
1.575
28.5
50
1.969
35
54
2.126
41
61
2.402
44
71
2.795
43
80
3.15
51.5
110
4.331
60
120
4.724
85
-5-
CHECK FOR
Not tight or secure
Damaged; does not close
Excessive wear
Distortion
Cracks
Excessive wear
Distortion
Cracks
Inadequate lubrication
Distortion
Broken or worn teeth
Cracks
Inadequate lubrication
Distortion
Cracks
Possible inability to
continue supporting
imposed loads
Not tight or secure
Removed or illegible
(replacement required)
N
N1
maximum throat opening
INCH
MM
INCH
1.083
31
1.22
1.122
33
1.299
1.378
41
1.614
1.614
45
1.772
1.732
50
1.969
1.693
49
1.929
2.028
66
2.598
2.362
90
3.543
3.346
94
3.701
F
P
For
maintenance
N1x105% and N+0.25"
1.28
1.36
1.69
1.86
2.07
2.03
2.73
3.72
3.89
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