Liftket B13 - Checking Slipping Clutch Release Limit; Load Chain; Lubricating the Load Chain; Checking Wear and Replacing the Chain

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10.3.4 Checking the release limit of the slipping clutch during regular inspections
The release limit of the slipping clutch has to be checked by a specialist during the regular inspection in accordance
with DGUV Regulation 52 (BGV D6 Article 26) and DGUV 54 (BGV D8 Article 23). At this point in time it should be
checked whether or not the hoist lifts the nominal load! The hoist may not lift a load that is greater than 1.6 times the
nominal load.
In case if test loads heavier than the nominal load are not available for the regular inspection, then the release limit of
the slipping clutch can also be checked using a suitable clutch testing device. In this case the release limit should be
1.3 x the nominal load. After checking the release limit, verify again whether or not the hoist lifts the nominal load.
In case of a defect the slipping clutch must be adjusted again, and the clutch release limit must be re-checked. The
set value is to be recorded in a protocol.
10.4 Load chain
Hoist chains are load bearing elements subject to mandatory inspections. Therefore, it is important to observe the
guidelines issued by the trade association’s centre for accident prevention regarding to round steel chains in hoisting
operation, the guidelines for general inspection and test specifications in accordance with DIN 685 section 5 of
November 1981, and DGUV Regulation 54 (BGV D8), DGUV Regulation 52 (BGV D6) and EN 818-7 of September
2002.
10.4.1 Lubricating the load chain upon first use and while in use
NOTE
The links along the entire length of the load chain must be lubricated in an unloaded
state with penetrating gear lubricant oil prior to the first use and regularly while it is in
use. As a function of use and operating circumstances the links must be re-lubricated
after cleaning.
In environments conducive to wear and tear (sand, emery) use a dry lubricant to
lubricate the chain (e.g. lubricating varnish, graphite powder).
10.4.2 Checking wear and tear and replacing the chain
CAUTION
The continuous monitoring of the load chain is a mandatory provision pursuant to
DIN 685 Part 5 and DGUV Regulation 54 (BGV D8 Article 27).
The load chain must be checked prior to first use and regularly once every 200
operating hours or every 10,000 lifting/lowering cycles under normal conditions, or more
often under harsh operating conditions.
Pay particular attention to check the chain links at their points of contact, for wear,
cracks, deformation and other damages.
The chain must be replaced:
• If the nominal thickness at the points of contact has reduced by 10%;
• If a link has elongated by 5 %, or if the chain, measured on 11 chain links, has elongated by 2%;
• If the links have become rigid.
t = nominal length of a single chain link
d = nominal diameter of a single chain
link
d
1
, d
2
= actual diameter
d
m
=
Diagram No 36: Chain dimensions
t
11 x t
d
d
d
1
2
d
1
+ d
2
2