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Pneumatic chain hoist CPA ATEX
8.3 MAINTENANCE OF LOAD CHAINS
The load chains are case-hardened and carry the designations 11 x
31 DAT.
The CPA ATEX Pneumatic chain hoists are specially designed for this
type of chain. For this reason only chains that have been approved by
the manufacturer may be used in these hoists.
Lubricating the load chain
The load chain must be lubricated before the fi rst start-up and every
month, however, after 50 hours of operation at the latest. Under some
extreme conditions such as an increased dust eff ect or a particularly
heavy-duty use, the intervals are to be shortened appropriately.
• The chain must be cleaned before lubrication. Burning off is not permis-
sible. Cleaning methods that do not deteriorate the chain material are
to be used (e.g. vapour degreasing, alkaline dip degreasing). Cleaning
methods that can cause hydrogen embrittlement, e.g. pickling or dipping
in acid solutions, as well as surface treatments, which can hide cracks
or damages, are to be avoided.
• The chain must be lubricated in a tension-free condition so that a
lubrication fi lm can be formed at joints. This can happen e.g. through
dipping in oil. The chain must be lubricated along the entire length.
• Engine oil of viscosity class VG 100, such as SHELL Tonna T68, can
be used as lubricant. A dry lubricant should be used in extremely dusty
environments.
Checking for wear
Load chains must be inspected for mechanical damage once every three
months and after 200 hours of operation at the latest.
Visual check: There should be no cracks, deformities, bends etc., along
the entire length of the chain.
Round-section steel chains must be replaced when the original nominal
thickness “d” on the chain link with the worst wear has been reduced
by more than 10% or if the chain has elongated over one pitch “pn” by
5% or over 11 pitches (11 x pn) by 2% (Fig. 16). The nominal values and
wear limits are shown in Table 2 below.
2-strand design
1. Dismantling the chain pin
The chain pin is situated on the underside of the chain hoist body. With
an Allen key remove the grub screw that serves as a locking device.
Thereafter, the chain pin is forced out through the hole in the compressed
air housing from the other side with the aid of a punch/awl.
Attention:
Do not damage the bolt or the seat.
2. Pull the chain out of the bottom block. Remove the chain end stop.
3. Fitting the new chain
Disconnect the second to last link on the idle strand of the old chain in
C shape. Then, remove the last link and suspend the new chain. The
welded seams of the chain links placed on top of the load chain point
Replacing the load chain
1-strand design
1. Dismantling the bottom block
Remove the locking ring with suitable pliers. Then disconnect the pipe
upward. Thereafter, the chain pins can be removed using an awl/punch.
Attention:
Do not damage the bolt bore.
2. Dismantling the chain end stop
Remove the 2 screws. The chain is now free.
3. Fitting the new chain
Disconnect the second to last link on the idle strand of the old chain in
C shape. Then, remove the last link and suspend the new chain. Here,
the welding seams of the upright chain links must face the chain guide,
but face away from the load chain wheel. Then the chain can be run in
by pressing the
-button.
4. Install the chain end stop and the bottom block
Before mounting the chain end stop or the bottom block, slide the buff ers
over the load chain. After mounting of the end piece, at least 1 chain
link must be left (see Figure 1).
Attention:
Use new SK nuts with a clamping section.
5. Before the initial operation lubricate the load chain and test all hoist
functions under no-load condition.
8.2 REGULAR INSPECTIONS, SERVICE AND TESTING
In accordance with existing national/international accident prevention
and safety regulations, lifting device must be audited at least one time
per year by a qualifi ed person. Particular operating conditions may also
dictate shorter inspection intervals.
The commissioning and periodic inspections can be recorded in the
accompanying test report or on page 39.
Repair work may only be carried out by a specialist workshop that uses
original Yale spare parts.
The inspection must determine that all safety devices are present and
fully operational and covers the condition of the hoist, lifting gear, ac-
cessories and supporting structure.
If required by the trade association, the results of inspections and ap-
propriate repairs must be verifi ed.
If the pneumatic lifting device (from 1 t lifting weight) is fi tted on or in a
trolley, or if the lifting device is used to move a lifted load in one or several
directions, the installation is considered to be a crane and the further
inspections must be carried out, in accordance with BGV D6 Cranes.
ATTENTION: The compressed air supply must be disconnected
while inspecting the device, unless the type of the examination
excludes this!
The load chain must be replaced if one of the limit values is exceeded.
t
11 x t
Fig. 16
d
1
d
2
Round steel chain 11 x 31 DAT
Inspection
Measurement
[mm]
Nominal value
[mm]
Limit value
[mm]
Elongation over 11 divisions
11 x t
341
347.8
Elongation over 1 division
t
31
32.6
Diameter
d
11.3
Average link thickness
d
1
+ d
2
2
11.3
10.2
Tab. 2
d = Nominal thickness of the chain
d
1
, d
2
= actual value
d
1
+ d
2
d
m
=
≤ 0.9 d
2
d
