Corrosion pitting
Bent or damaged chain links
Chain drawn tight
Wear over 11 pitches (Amax)
Single pitch wear (Bmax)
Elongation of a single link (Dmax)
A check gauge can be obtained on request from JDN
(Art. No. 12173).
Please observe the information contained
in DIN 685, part 5 when checking chains. For further
instructions, see ISO 7592.
R E M O V I N G C H A I N
The chain sprocket must be replaced together with the
chain, as otherwise increased wear of the new chain is
to be expected.
Detach the chain box from the hoist body.
Then detach load sleeve, clamp, buffer and buffer
discs from the chain as described in the section
Replacing load hook including load sleeve and
buffer,
page 39, and allow chain to run out of the
hoist.
To replace the chain sprocket, the gearbox must be
removed (see E-list).
After replacing the chain sprocket and
installing the hoist, the chain can be drawn in.
D R AW I N G I N T H E C H A I N
Drawing in the chain
2
1
View
R E P L AC I N G C H A I N A N D
C H A I N S P RO C K E T
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M A I N T E N A NC E
Page 40
11 x t
d
1
d
2
Chain d x t (mm)
4 x 12
7 x 21
A
max.
142.9
249.2
11 x t
inside max.
135.2
235.8
B
max
12.7
22.1
C
min
3.6
6.3
D
max
20.6
36.1
Check dimensions of chain
c =
d
1
+ d
2
2
Summary of Contents for JDN mini Series
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