Instruction manual SMV 10 600B – 60 1500B Publ. no. 6196.082 1117, Version 02
93
Service and maintenance
Inspection of lifting chains
In order to ensure a high degree of safety, the lifting chains must be
inspected on the following items using the time intervals available
in section "Inspection and maintenance schedule" on page 98.
The chains must be properly cleaned in their entire length.
Inspection is performed without a load.
• The chain must not have increased by more than 3% based on
its original length.
• Measuring is done over the 25 links that are lifted first and
(most often) break on the return wheel. This is where the
extension is the greatest.
• Compare with the value for the given machine size in the chart
below.
• If the 3% limit has been exceeded, the chain/chains must be
replaced.
NOTE
Local regulations, or if safety depends on a single chain, may require
that the chain is replaced in the event of a 2% extension.
Machine
Parting (p)
New chain,
measurement over
25 links
mm
Measurement over
25 links for
2% extension
mm
Measurement over
25 links for
3% extension
mm
inches
mm
SMV 10-12
1 1/2
38.10
952.50
971
981
SMV 12-33
2
50.8
1,270
1,295
1,308
SMV 37-45
2 1/2
63.50
1587.50
1,619
1,635
SMV 52-60
3
76.2
1,905
1,943
1,962
WARNING
If a chain breaks, the load may fall
uncontrollably and cause damage or injury.
Danger of serious personal injury or fatality.
If in doubt, the chain must be replaced.
Chains are always replaced in their entirety, it is not permitted
to splice or re-rivet lifting chains.
Also ensure that:
• there are no lose pins in the outside washers,
• there are no visible cracks in any washer (link section),
• there is no visible mechanical damage,
• there is no jarring noise when the chain moves,
• the chain is not corroding,
• that the chain bends easily over the return wheel (does not resist
bending).
Lubricate the chains after inspection using a thin oil or lubrication
spray.
