So many variable factors can cause the
deterioration of wire line cable that it is not
possible to determine a definite life expectancy.
Some of these factors are:
1. Load being handled.
2. Corrosive conditions.
3. Maintenance of the unit.
A. Keep the sheaves turning freely
B. Maintain tension on cable to insure
proper spooling
C. Avoid kinks in cable
D. Avoid abrasive action and contact with
sharp corners
4. Frequency of use.
Auto Crane units, up to 2,400 pound ratings, use
3/16 inch diameter galvanized pre-formed 7 x 19
aircraft cable. This cable has a working strength,
when new, of 4,200 pounds. It is recommended
when 1,200 pound loads are exceeded to use a two
part line with a traveling block. This will ensure a
3.5 to 1 safety factor when the cable is new.
Keeping the above factor of safety in mind and
knowing the kind of loads that will be handled, the
user can determine by inspection of the cable as to
when it should be replaced.
Items to look for while inspecting the cables
are:
1. Broken strands.
2. Kinks and flattened sections.
3. Corrosion and abrasion.
LIFE OF WIRE LINE
WIRELIF 10/98
1-6.0.0
WIRE LINE LUBRICATION
Lubrication of the wire line serves two
important purposes:
(1)
helps to prevent
corrosion;
(2)
lubricates the cable strands to
reduce wear due to flexing and abrasion caused
by contact with the sheaves, rollers, and cable on
the drum.
PREPARATION:
Remove rust and foreign matter with a wire brush
and wipe clean. Be sure cable is dry.
APPLICATION:
Method 1:
A light weight motor oil may be used
by dipping a brush into the lubricant and applying.
In some cases, a rag or piece of sheepskin is
dipped in the lubricant and used to swab the
lubricant on to the rope.
Method 2:
A heavier lubricant such as a grease
gun lubricant may be used by applying with hands
while wearing leather gloves. (Leather gloves are
preferred to canvas because of greater protection
and less penetration of the grease)
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