4.3 Periodic Inspection
J
Periodic inspections should be made at the interval shown below and should follow the given
procedures.
1NORMAL(Normal use):
2HEAVY(Frequent use):
3SEVERE(Excessively frequent use):
Semiannual inspection
Quarterly inspection
Monthly inspection
Regular Inspection
Procedure
Figuresin parentheses are Figure Nos. in Parts List.
,
11
I
Item
I InspectionMethod
Discard Limit/Criteria
I
Measures
Name Plates
I Checkvisually
Capacity indication is not
Attach new name
clear.
plate.
I
I
Hook (1,4,44,56,
66,75)
(Upper & Lower)
1. Deformation/
Measure dimension
Dimensions are greater
I
Replace the hook.
twist of hook,
"e" between two
than those in the following
opening of
embossed marks at
table.
J
hook.
time of purchase with
a
slide calipers.
Check visually.
I
Twist is large enough to be
I
Replacethe hook.
detected visually.
2.Wear
Measure "c" and "d"
I
The dimensions are more
I
Replace the hook.
with slide calipers.
than 5% greater than those
just after purchase.
(Reference
values)
Table 1
Cap.
a
b
c mm(in)
d mmOn)
(U.S.
Normal
Normal
ton)
mmOn)
mmOn)
Normal
Discard
Normal
Discard
1/2
31.0(1.220)
27.0(1.063)
17.0(0.669)
15.3(0.602)
12.1(0.476)
10.9(0.429)
1
34.0(1.338) 29.0(1.142)
21.8(0.858)
19.6(0.772)
16.0(0.630)
14.4(0.567)
11/2
37.5(1.476)
34.0(1.339)
26.5(1.043)
23.8(0.937)
19.5(0.768)
17.5(0.689)
2
40.0(1.575)
36.0(1.417)
30.0(1.181)
27.0(1.063)
21.8(0.858)
19.6(0.772)
3
46.0(1.811)
42.5(1.673)
37.5(1.4 76)
33.7(1.327)
27.2(1.071)
24.4(0.961)
5
50.0(1.968)
46.5(1.831)
47.5(1.870)
42.7(1.681)
34.5(1.358)
31.0(1.220)
