DEMAG DC-Com 1, Operating Instructions Manual

Page: 75 / 116

Measuring wear or deformation of the original Demag chain
Two methods can be used to measure wear or deformation of the original Demag chain:
● Measuring with a calliper gauge:
- wear of a single chain link

Fig. 44, Page 75;
- on 11 chain links

Fig. 45, Page 75.
● Measuring with a chain gauge:
- on 11 chain links
 Fig. 46, Page 76.
Measuring wear of a single chain link with a calliper gauge
Fig. 44
The chain link contact areas must be visually checked for traces of wear. If the chain hangs at angle when no load
is attached to it, for example, this usually indicates wear of an individual chain link.
Measure the diameter of the chain link material in the chain link contact area using a calliper gauge, if required.
For minimum link diameter values, see  "Tab. 53", Page 75.
Measuring with a calliper gauge on 11 chain links
Fig. 45
A partial load must be suspended from the load hook when measuring
the chain over 11 links.
Measurements on 11 chain links may be taken in steps of 2 x 3 and 1 x
5 chain links.
The sum total of the 3 readings taken, i.e. a
1
+ a
2
+ a
3
must not exceed
the specified limit a. Otherwise the chain must be replaced.
Demag is stamped on every 12th link of genuine Demag chains.
Do you find that, on fitting a new chain, it does not run smoothly over
the sprocket? Please contact our after-sales service centre.
We strongly recommend that you use genuine Demag chains. This will
ensure that the safety and service life of the chain hoist is guaranteed.
Demag chain hoist DC 1 - 2 DC 5 DC 10
Chain designation d x t [mm] 4,2 x 12,2 5,3 x 15,2 7,4 x 21,2
Limit dimensions according to DIN 685 part 5
Measurement over the outside of 11 chain links,
maximum dimension a = a
1
+ a
2
+ a
3
[mm] 144,7 180,3 253
Overall length of 1 chain link inside,
max. dimension t
[mm] 12,8 15,9 22,4
Measurement of the chain link diameter,
minimum dimension d
m
= 0,9 x d
[mm] 3,8 4,8 6,7
Tab. 53
The limit dimensions apply to all hoist chains listed in

"Available hoist chains", Page 77.
214
80
2 44/291
113
75