Manitowoc GROVE 5540F Operator's Manual page 73

5540F/YB5515 OPERATOR'S MANUAL
Know the capacity of the crane. The operator must be
familiar with the crane's capacity chart before lifting a
load. A falling load or machine tip-over can cause injury
or death.
NOTE: When lifting a load, keep your eyes on the load at
all times. If you must look away, stop the movement
of the load first. A moving load can cause injury or
death.
Always have a flagman give assistance if you can
not see a moving load. Be sure you can see the
flagman at all times. Agree in advance to hand
signals to be used. A moving load can cause injury
or death and/or property damage.
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 raise the drop block is stopped. A
horn will sound, warning the operator that the block
has touched the bracket. The operator must then
GROVE
OPERATING CONTROLS AND PROCEDURES
To Raise the Drop Block
Press the accelerator pedal to increase the engine speed to
maximum rpm. Slowly pull back on the hoist control lever
(Figure 3-54) until the desired raising speed is obtained. The
further the control is pulled back the faster the drop block will
raise.
To Stop Drop Block Movement
Slowly move the control lever to the neutral position and
decrease the engine speed to idle.
To Lower the Drop Block
Press the accelerator pedal to increase the engine speed to
maximum rpm. Slowly push forward on the hoist control lever
(Figure 3-54) until the desired lowering speed is obtained.
The further the control is pushed forward the faster the drop
block will lower.
Lower drop block - push forward
Raise drop block - pull backward
Raising and Lowering the Drop Block
Published 10-21-2011, Control # 055-03
lower the drop block to stop the horn and allow for
other boom functions.
The above information also pertains when a boom
extension is attached to the boom.
3
a1847
FIGURE 3-54
3-29