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PAGE 32 — LT12DAB LIGHT TOWER • OPERATION MANUAL — REV. #0 (06/03/11)
MAINTENANCE
CHECK CABLE WEAR
The wire rope (cable) that raises and extends the mast is
a very important part of the light tower. There is one cable/
hand winch system, located on the tongue of the trailer, that
raises and extends the light tower mast. There is a second
cable/hand winch system located on the mast that serves to
raise and lower the two extendable sections of the mast.
SERVICING THE MAST RAISE/LOWER CABLE SYSTEM:
To replace any components in the mast raise/lower cable
system, use the following steps (See Figure 19):
Figure 19. Mast Raise/Lower Cable System
1. Lower the mast to the horizontal resting position.
2. Inspect the cable clamps, pulleys, and other components
for worn or damaged parts.
3. Disconnect the cable from the winch and remove from
the mast pulley and cable sheave. Detach the cable
from the hand winch as necessary.
4. Replace the pulley and the cable as needed.
DANGER
Wire rope (cable) will fail if it is worn, frayed, misused,
crushed, kinked or damaged in any way. Always check
the cables and pulleys for any abnormalities before
use.
Do not use it if there is even the slightest cause for
concern and replace any damaged cables or pulleys
immediately.
5. Rethread the cable through the pin and pulleys and
reattach the cable to the winch.
6. Raise and lower the mast several times to verify correct
operation.
SERVICING THE MAST EXTENSION CABLE SYSTEM:
To replace the cable in the mast extension cable system,
use the following steps (See Figure 20):
Figure 20. Mast Extension Cable System
1. Lower the mast to the horizontal resting position.
2. Inspect the cable clamps, pulleys, and other components
for worn or damaged parts. If either of the cables on
the mast needs to be replaced, they should both be
replaced at the same time.
3. Disassemble the mast by disconnecting the cables from
the mast and sliding the sections apart. Plastic guides
and lock bolt must be removed. The lower cable can
be disconnected from the winch.
4. There are two pulleys in the mast raise/lower cable
system. They should be removed and replaced if worn
or damaged. Worn or damaged pulleys can cause
premature cable failure.
5. Reassemble the mast extension cable system by
connecting the cable to the bottom of the upper mast
and sliding the upper mast into the opening of the
center mast. Connect the second cable to the bottom
of the center mast and slide the center mast into the
opening of the lower mast, observing proper lifting
techniques.
CENTER
MAST
PULLEY
ROUTE TO
HAND WINCH
LOWER
MAST
PULLEY
UPPER
MAST
CENTER
MAST
LOWER
MAST
LOWER
MAST
SHACKLE
WARNING
The mast sections are heavy and awkward to handle.
Use proper lifting devices and procedures when
servicing the mast and its components.