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GROVE
Published 10-21-2011, Control # 055-03
3-27
5540F/YB5515 OPERATOR’S MANUAL
OPERATING CONTROLS AND PROCEDURES
3
Boom Lift Operation
Know the capacity of the crane. The operator must be
familiar with the crane’s capacity chart before lifting a
load. See how to read the capacity chart in Section 4 of
this manual. A falling load or machine tip-over can cause
injury or death.
NOTE:
Look for overhead obstructions before raising the
boom. Possible damage or electrocution could
occur if the boom comes in contact with over head
power lines.
Always operate the hoist control to unwind the wire
rope when raising the boom.
DO NOT
let the drop
block touch the boom head. An automatic cutout
device is installed on this crane to inhibit the drop
block from being pulled into the boom head. When
the drop block touches the anti-double blocking
bracket (Figure 3-50) hanging from the boom head,
a switch is activated and the hydraulic flow to
extend the lift cylinder is stopped. A horn will
sound, warning the operator that the block has
touched the bracket. The operator must then lower
the drop block to stop the horn and allow for the
raising of the boom.
The above information also pertains when a boom
extension is attached to the boom.
To Raise The Boom
Press the accelerator pedal to increase the engine speed to
maximum rpm. Slowly pull back on the boom control lever
(Figure 3-53) until the desired raising speed is obtained. The
further the control is pulled back the faster the boom will
raise.
NOTE:
If the crane is equipped with an LMI system,
DO
NOT
fully raise the boom and dead end the
cylinder. If the cylinder dead ends, the LMI will
sense an overload situation and shutdown the hoist
operation. The bypass switch on the LMI must then
be actuated in order to resume operation.
To Stop Boom Movement
Slowly move the control lever to the neutral position and
decrease the engine speed to idle.
To Lower The Boom
Press the accelerator pedal to increase the engine speed to
maximum rpm. Slowly push forward on the boom control
lever (Figure 3-53) until the desired lowering speed is
obtained. The further the control is pushed forward the faster
the boom will lower.
1100254
Reference Only