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A25317-A-1119
page 8
Owner's Manual for Thern 5FT20 and 5FT25 Captain Series Stationary Davit Cranes
2.2
Preparing for Operation
Do not make adjustments to the ratchet jack while the crane is loaded. To do so
may require the use of excessive force which could cause damage or injury.
Do not adjust the boom extension while the crane is loaded.
When adjusting boom length, set the boom angle just above the lowest angle
and hold the boom extension securely so it does not slide abruptly in or out of
the boom causing damage or injury.
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).
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 3.
a
ADJUST BOOM LENGTH by moving the boom extension in or out.
Do
not make adjustments while the crane is loaded. The load rating
decreases as you increase boom length. See the Performance
Characteristics Tables on pages 22-23.
b
ADJUST BOOM ANGLE by operating the ratchet jack to raise or lower the
boom.
The lift height below base level decreases as you raise the boom.
See the Performance Characteristics Tables on pages 22-23.
Figure 3 – Positioning
the Boom
Important!
• When determining whether
the load will exceed the load
rating, consider the total force
required to move the load.