Owner's Manual for Thern 5PA5 and 5PA10 Ensign Series Portable Davit Cranes
page 9
A115771-0617
2.3
Attaching the Load
Do not wrap the wire rope around the load. This damages the wire rope and
could cause the load to escape. Use a sling or other approved lifting device.
2.3.1
CLEAR OBJECTS from the path of the load so you can move it freely and
observe it at all times during the operation.
2.3.2
MAKE SURE THE WIRE ROPE is not twisted. A twisted wire rope could
cause the load to spin when it is raised off the ground.
2.3.3
ATTACH THE LOAD using a nylon sling, or other approved lifting device.
Follow the recommendations of the sling manufacturer.
a
SEAT THE SLING in the saddle of the hook with the hook latch completely
closed. See Figure 8.
b
CENTER THE LOAD on the hook so it will remain balanced and not tip or
rotate to one side.
2.4
Moving the Load
2.4.1
MOVE THE LOAD slowly and smoothly, only a small distance at first.
Make sure the load is balanced and securely attached before continuing.
2.4.2
OPERATE THE WINCH to raise or lower the load. Refer to the instructions
in the Winch Owner’s Manual
.
2.4.3
OBSERVE THE WIRE ROPE as it winds onto the drum. If it becomes
loose, uneven, or overlapped, stop the operation and rewind the wire rope
before continuing.
Continued operation with overlapped or uneven wire
rope can damage the wire rope and shorten its life.
2.4.4
ADJUST THE BOOM ANGLE,
if necessary, to keep the sheave centered
over the load. Do not make adjustments while the crane is heavily loaded.
2.4.5
ROTATE THE BOOM to move the load side-to-side.
a
ROTATE THE BOOM slowly and smoothly to avoid swinging the load or
causing shock loads.
Do not jam the boom against other objects.
b
USE THE HANDLE to rotate the boom.
Do not push or pull the load or
the wire rope to rotate the boom.
Figure 8 – Attaching Load
latch closed
tight against
hook
sling seated in
saddle of hook
Important!
• Obey a stop signal from anyone.
• Maintain tension on the wire
rope to keep it tightly and evenly
wound on the drum.
• If the crane and load are not
visible during the entire operation,
get help from another person.
• Appoint a supervisor if more
than one person is involved in
the operation. This will reduce
confusion and increase safety.
• When lifting a load, use a tag line
to keep the load from swinging or
twisting, while keeping yourself
away from the load.
