J. D. NEUHAUS PROFI 25TI, Original Operation And Assembly Instructions

Page: 56 / 72

powered by air!
Page 56
MAINTENANCE
REMOVING AND INSTALLING CHAIN
ATTENTION!
The chain supplied together with this JDN hoist is
matched to the chain sprocket according to strict
tolerances. In order to ensure optimum function of
the chain and in order to prevent hazards, only
genuine JDN chains must be installed.
Note: When a chain is replaced, the buffers must also be replaced.
For changing buffers at the chain ends, see Removing and
installing load sleeve, bottom block, clamp and buffer, page 52ff.
Buffers and run-on elements not located on the chain ends are most
easily replaced when the open chain link between the old and new
chains passes the buffer to be replaced.
ATTENTION!
Do not twist the chain ends.
In the case of operation with chain box: Switch the hoist in the
“lower” rotational direction and run the old chain out of the
chain box. Then remove the chain box.
Move the bottom block as close as possible to the hoist body
and position it securely.
In the case of hoists without chain box, detach the idle chain
from the chain mount on the hoist body, see also Removing
and installing load sleeve, bottom block, clamp and
buffer, page 52ff.
Remove the clamp, buffer, buffer discs and where applicable
spacers from the end of the idle chain.
In the case of dual and quadruple chain hoists with chain box,
detach the bottom block chain from the hoist body.
In the case of treble chain hoists, detach the bottom block
chain from the mount on the bottom block, see also
Removing and installing load sleeve, bottom block,
clamp and buffer, page 52ff.
Attach the new chain to the end link of the load section of the
old chain after aligning the welds and the first chain link by
means of an open chain link. The welds on the upright chain
links must face outwards when running over the chain
sprockets. For this reason, the welds of the chain links which
lie flat in the drive sprocket must face towards the gearbox in
the case of treble and quadruple chain hoists.
If the first link of the new chain is not correctly positioned, it
must be removed.
Note: It is possible that the first chain link of the other chain end is
correctly positioned.
Switch the hoist to the “lift” rotational direction. The new chain
will now run into the hoist while the old chain is
simultaneously run out on the idle chain side.
Run the chain until the join between the old and new chain has run
sufficiently (approx. 1m) out of the centre section on the idle chain
side.
Detach the connection between the old and new chains.
Install the clamp at the 12
th
or 6
th
chain link (in the case of
operation with chain box), buffer, buffer discs and, where
applicable, spacers on the idle chain section of the new chain.
In the case of operation without a chain box, align the idle chain and
attach at the mounting point on the hoist body,
see also Removing and installing load sleeve, bottom block,
clamp and buffer, page 52ff.
Attach the chain box if necessary.
Switch the hoist in the “lift” rotational direction until the as
yet free end of the aligned load chain is the correct length
for attaching the chain link – for dual and quadruple chain
hoists, at the mounting point on the hoist body – for triple
chain hoists at the fastening point of the bottom block, see
also Removing and installing load sleeve, bottom block,
clamp and buffer, page 52ff.
Note: If the chain link of the load chain is positioned incorrectly, it
must be removed, the following chain link will be positioned
correctly.