8.3. ELECTRICAL EQUIPMENT
When any electrical equipment is removed for maintenance, any exposed conductors that remain
must be mechanically and electrically secured in a manner to prevent the occurrence of an unsafe
condition.
8.4. RECOIL DRUM (Telescopic cranes)
GENERAL
In normal use little attention to maintenance is required.
8.4.1.
110’ Recoil Drum – (DRURW33LAAX)
Periodically, simply observe that reel behaves correctly when extending and, retracting cable
without hesitation. Check wound cable for damage at anchor pulley and generally.
At major machine service intervals, remove reel cover and check that interior is clean and dry.
Check slip rings are clean with no signs of arcing. Check collector brushes are correctly located on
rings and, that brush spring pressure is being maintained. Replace cover making sure that seal is
located correctly all round.
8.4.1.1.
Rewind Spring Mechanism
In the unlikely event of rewind spring failure, the reel will require to be removed from the
machine on which it is fixed.
With the reel on the bench, remove cover and disconnect potentiometer from engagement,
tie back spring loaded arm, disconnect wiring which passes through the reel shaft.
Turn unit over to stand on its 4 cover studs and withdraw cable from shaft.
Release socket screws, 2 at 90
, holding cable compartment onto shaft and withdraw
compartment, complete with cable.
The spring compartment is now exposed and, the 4 nyloc nuts and the cover may be
removed.
The rewind spring will now be visible and seen to be held in a captive band. A broken
spring normally occurs close to the arbor, as this is at the point of maximum flexing. If this
is seen to be the case, the spring may be lifted out,
“BEING VERY CAREFUL TO
ENSURE THAT THE COILS REMAIN WITHIN THE CAPTIVE BAND.”
Tie the spring with soft iron wire or stout cord, as seen on the replacement spring.
Alternatively box up securely and label danger, for disposal.
Remove broken portion of spring from arbor, check for any foreign bodies, apply grease to
the arbor and fit replacement spring.
Replace spring cover making sure that seal is correctly located.
Re-assemble reel in reverse order, paying particular attention to correctly locating cable
compartment boss onto shaft and that socket screws are correctly located in shaft dimples.
Use Loctite “Screwlock.”
Unit may now be fully re-assembled and full setting up procedure, (installation may be
completed.
8.4.1.2.
Replacing the Payout cable
Reading through the instructions for changing a spring will help with fitting a replacement
cable.
You can save time and effort if, when removing a damaged cable, having disconnected at
the slip-ring, the old cable is used to pull a drawstring through the shaft. The drawstring
can be fixed to the end of the new cable to draw through the shaft.
Ensure that cable glands or seals are all correctly fitted and that reel rotates freely.
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