OPERATING CONTROLS AND PROCEDURES CD5520/YB5520 OPERATOR MANUAL
3-22 Published 07-06-2017, Control # 406-03
Boom Telescope Operation
To Extend the Boom
Press the accelerator pedal to increase the engine speed to
maximum rpm. Slowly push forward on the telescope control
lever (Figure 3-34) until the desired extend speed is
obtained. The further the control is pushed forward the faster
the boom will extend.
To Stop Extension/Retraction
Slowly move the control lever to the neutral position and
decrease the engine speed to idle.
To Retract the Boom
Press the accelerator pedal to increase the engine speed to
maximum rpm. Slowly pull back on the telescope control
lever (Figure 3-34) until the desired retract speed is
obtained. The further the control is pulled back the faster the
boom will retract.
WARNING
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 3-33) 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.
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