Removing Cable - Textron GREENLEE Ultra Tugger 6800-22 Manual De Operación

Removing Cable

Removing old cable involves the same principles as
installing new cable. However, there are some important
differences.
Pulling Force
It is difficult to predict the amount of pulling force
necessary to remove an old cable. The cable may be
damaged, and it may break with an unexpectedly low
pulling force.
The required pulling forces may be very high:
• The cable has probably "taken a set." Unlike the new
cable on a reel, cable in conduit has probably been in
the conduit for years, or perhaps decades. The cable
will resist bending and straightening as it is pulled
through the conduit.
• The pulling lubricant has probably hardened,
increasing pulling resistance.
• The insulation may be damaged and the cable may be
corroded.
• Dirt or other foreign matter may have entered the
conduit and may have cemented the cable in place.
Using a Force Gauge
When pulling old cable out of a conduit, the pulling force
will be highest when starting the pull. Select a cable
puller and pulling components to meet or exceed the
estimated amount of pulling force necessary to remove
the old cable. Because breaking the cable free will
require the largest amount of pulling force, it is neces-
sary to use a force gauge to prevent overloading the
system components. Use the 07120 Force Gauge Unit.
Carefully monitor the pulling force at the force gauge; if
the puller is not able to begin the pull, shut off the puller
and disassemble the setup. Start over with a puller and
components of a higher force rating.
Greenlee / A Textron Company
6800-22 Ultra Tugger
41
Cable Puller and Pulling Package
®
Puller Placement
Pulling out old cable is generally accomplished with the
puller located some distance away from the end of the
conduit. This allows the pulling crew to pull out a long
section of cable before turning off the puller, cutting
off the cable, and reattaching the grip(s). Mounting the
cable puller a distance away from the end of the conduit
increases the amount of exposed rope, which greatly
increases the amount of violent whipping action which
would occur if the rope were to break.
To isolate the operator from the rope path:
• Locate the puller so that you will stand behind an
obstruction, such as a wall. Set up the puller so that
you will be able to maintain control of the pull. You
need a clear view of the rope as it feeds onto the
capstan, including several feet of the rope in front of
the capstan. You must be able to turn off the puller
before the pulling grip, connector, or swivel contacts
the capstan.
• Use an additional pulling sheave to change the direc-
tion of the tailing rope. Anchor the sheave so that
you are close enough to maintain control of the pull.
You need a clear view of the rope as it feeds onto the
capstan, including several feet of the rope in front of
the capstan. You must be able to turn off the puller
before the pulling grip, connector, or swivel contacts
the capstan.
Note: Use the additional pulling sheave to change the
direction of the tailing rope (after the rope leaves the
capstan). Do not change the direction of the pulling
rope.
• Use a longer tailing rope than usual and stand away
from the puller. Stand as far from the puller as pos-
sible, while maintaining control of the pull. You need
a clear view of the rope as it feeds onto the capstan,
including several feet of the rope in front of the
capstan. You must be able to turn off the puller before
the pulling grip, connector, or swivel contacts the
capstan.
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