Table of Contents
Advertisement
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
necessary to use a force gauge to prevent overloading
the system components. For the 120-volt Super Tugger,
use the 31465 Force Gauge. For the 220-volt Super
Tugger, use the 31470 Force Gauge.
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 Tools, Inc.
6000-Series Super Tugger Cable Pullers
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 or other components 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
direction 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 possible, 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.
24
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Advertisement
Table of Contents
