L401 & L404 OPERATION INSTRUCTIONS 5. Regular Maintenance
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5. Regular Maintenance
5.1 Corrosion
CAUTION: Wire ropes are a high wear item and must be inspected
regularly to prevent failure. They MUST be replaced at the
first sign of any symptoms listed below. The complete set
MUST be replaced every 20,000 cycles or every six years
unless earlier replacement is indicated by the required
service inspections (see the maintenance schedule
following).
The best preventive maintenance against wire rope corrosion is to keep the wire
ropes well lubricated. The oil prevents moisture from entering into the wire rope
strands. Once salt and moisture have penetrated into the core of the wire rope they
are very difficult to displace and corrosion will begin immediately. The best method to
prevent early replacement of wire ropes is to keep them well oiled.
The following are specific signs to look for when inspecting wire ropes for corrosion:
• More than surface rust on exterior of the wire rope is unacceptable. In other
words, if you can’t remove the rust easily with a wire brush, it’s too deep and the
wire rope should be replaced.
• Any pitting of the wire rope indicates unacceptable amounts of corrosion. The
wire rope should be replaced.
• Loss of flexibility of the wire rope is unacceptable. This can be checked with the
lift raised and set on the locks. If found, the wire rope should be replaced.
• If any wires are broken, the wire rope should be replaced.
• Any “necking” or reduction in cross sectional area of the wire rope indicates a
problem and the wire rope should be replaced.
NOTE: If an area of the wire rope has no lubricant on its surface, the
wire rope is rust bound and should be replaced. Once the
wire rope has lost oil protection, moisture has already
entered the core and is nearly impossible to remove.
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