Owner's Manual for Thern 5PA5 and 5PA10 Ensign Series Portable Davit Cranes
page 8
A11577I-0617
2.2
Preparing for Operation
2.2.1
CONSIDER THE OPERATION. Do not begin until you are sure you can
perform the entire operation without hazard.
2.2.2
INSPECT ALL COMPONENTS of the system.
a
INSPECT THE CRANE and other equipment according to the Instructions
for Frequent Inspection.
b
INSPECT THE WINCH according to the instructions in the Winch Owner’s
Manual.
c
OPERATORS must be in good health, alert, thoroughly trained in operating
the equipment, and properly clothed (hard hat, safety shoes and safety
glasses, no loose clothing, etc).
d
THE LOAD must be clear of other objects and free to move. Make sure the
load will not tip, spin, roll away, or in any way move uncontrollably.
2.2.3
KNOW YOUR LOAD and make sure you do not exceed the load rating of
the crane or any other equipment in the system.
2.2.4
POSITION THE BOOM so the load hook is centered over the load.
Avoid
side pulls which could damage the crane or cause the load to tip. See
Figure 7.
a
ADJUST SHEAVE POSITION by moving the sheave assembly up or down
the boom. Do not make adjustments while the crane is loaded.
The load
rating decreases as you increase sheave distance from mast.
See the
Performance Characteristics Tables pages 22-23.
b
ADJUST BOOM ANGLE by rotating the boom adjustment brace knob to
raise or lower the boom. Do not make adjustments while the crane is loaded.
The lift height below base level decreases as you raise the boom.
See the
Performance Characteristics Tables pages 22-23.
Figure 7 – Positioning
the Boom
center line
center line
correct
incorrect
Important!
• When determining whether the
load will exceed the load rating,
consider the total force required
to move the load.