GROVE Published 10-21-2011, Control # 055-03 3-25
5540F/YB5515 OPERATOR’S MANUAL OPERATING CONTROLS AND PROCEDURES
Boom Telescope Operation
NOTE: Always operate the hoist control to unwind the wire
rope when extending 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 telescope 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 extension of the boom.
The above information also pertains when a boom
extension is attached to the boom.
Boom Swing
FIGURE 3-51
Swing Right - Push Forward
Swing Left - Pull Backward
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